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free5GC 5GC & UERANSIM UE / RAN Sample Configuration - ULCL with one I-UPF and two PSA-UPFs

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free5GC 5GC & UERANSIM UE / RAN Sample Configuration - ULCL with one I-UPF and two PSA-UPFs

This describes a very simple configuration that uses free5GC and UERANSIM for ULCL with one I-UPF and two PSA-UPFs.

List of Sample Configurations

  1. One SMF, Multiple UPFs and DNNs
  2. Select nearby UPF according to the connected gNodeB
  3. Select UPF based on S-NSSAI
  4. ULCL(Uplink Classifier)
  5. ULCL with one I-UPF and two PSA-UPFs (this article)

Table of Contents

Overview of free5GC 5GC Simulation Mobile Network

The following minimum configuration was set as a condition.

  • I-UPF selects the communication paths according to the destination host and network.
  • I-UPF connects with multiple PSA-UPFs and each PSA-UPF has the routing information to a specific network.

The built simulation environment is as follows. In this configuration, each PSA-UPF must be reachable to Docker network on local.

The 5GC / UE / RAN used are as follows.

Each VMs are as follows.

VM # SW & Role IP address OS Memory (Min) HDD (Min)
VM1 free5GC 5GC C-Plane 192.168.0.141/24 Ubuntu
20.04		 2GB 20GB
VM2 free5GC 5GC U-Plane (I-UPF) 192.168.0.142/24 Ubuntu
20.04		 1GB 20GB
VM3 free5GC 5GC U-Plane (PSA-UPF1) 192.168.0.143/24 Ubuntu
20.04		 1GB 20GB
VM4 free5GC 5GC U-Plane (PSA-UPF2) 192.168.0.144/24 Ubuntu
20.04		 1GB 20GB
VM5 UERANSIM RAN (gNodeB) 192.168.0.131/24 Ubuntu
20.04		 1GB 10GB
VM6 UERANSIM UE 192.168.0.132/24 Ubuntu
20.04		 1GB 10GB

Subscriber Information (other information is default) is as follows.
Note. Please select OP or OPc according to the setting of UERANSIM UE configuration files.

UE IMSI DNN OP/OPc
UE 001010000000000 internet OPc

I registered these information with the free5GC WebUI. In addition, 3GPP TS 35.208 "4.3 Test Sets" is published by 3GPP as test data for the 3GPP authentication and key generation functions (MILENAGE).

DN is as follows.

DN TUNnel interface of DN DNN TUNnel interface of UE
10.60.0.0/16 upfgtp internet uesimtun0

The UE routing topology is as follows.

                    --- PSA-UPF1
                    |
UE --- gNodeB --- I-UPF
                    |
                    --- PSA-UPF2

The communication paths to be confirmed for each destination IP address are as follows.

Destination IP address Communication path
google.com I-UPF --> PSA-UPF1 --> Internet
8.8.8.8 I-UPF --> Internet
172.17.0.1 I-UPF --> PSA-UPF1 --> 172.17.0.0/16 (Docker network on local)
172.18.0.1 I-UPF --> PSA-UPF2 --> 172.18.0.0/16 (Docker network on local)

Changes in configuration files of free5GC 5GC and UERANSIM UE / RAN

Please refer to the following for building free5GC and UERANSIM respectively.

Changes in configuration files of free5GC 5GC C-Plane

  • free5gc/config/amfcfg.yaml
--- amfcfg.yaml.orig    2022-04-01 20:25:54.000000000 +0900
+++ amfcfg.yaml 2022-08-16 19:06:54.707038398 +0900
@@ -5,7 +5,7 @@
 configuration:
   amfName: AMF # the name of this AMF
   ngapIpList:  # the IP list of N2 interfaces on this AMF
-    - 127.0.0.18
+    - 192.168.0.141
   sbi: # Service-based interface information
     scheme: http # the protocol for sbi (http or https)
     registerIPv4: 127.0.0.18 # IP used to register to NRF
@@ -23,18 +23,18 @@
   servedGuamiList: # Guami (Globally Unique AMF ID) list supported by this AMF
     # <GUAMI> = <MCC><MNC><AMF ID>
     - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
-        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+        mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+        mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
       amfId: cafe00 # AMF identifier (3 bytes hex string, range: 000000~FFFFFF)
   supportTaiList:  # the TAI (Tracking Area Identifier) list supported by this AMF
     - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
-        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+        mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+        mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
       tac: 1 # Tracking Area Code (uinteger, range: 0~16777215)
   plmnSupportList: # the PLMNs (Public land mobile network) list supported by this AMF
     - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
-        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+        mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+        mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
       snssaiList: # the S-NSSAI (Single Network Slice Selection Assistance Information) list supported by this AMF
         - sst: 1 # Slice/Service Type (uinteger, range: 0~255)
           sd: 010203 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
  • free5gc/config/smfcfg.yaml
--- smfcfg.yaml.orig    2022-10-08 23:46:07.762464543 +0900
+++ smfcfg.yaml 2022-10-08 17:59:44.056551861 +0900
@@ -32,42 +32,72 @@
           dns: # the IP address of DNS
             ipv4: 8.8.8.8
   plmnList: # the list of PLMN IDs that this SMF belongs to (optional, remove this key when unnecessary)
-    - mcc: "208" # Mobile Country Code (3 digits string, digit: 0~9)
-      mnc: "93" # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+    - mcc: "001" # Mobile Country Code (3 digits string, digit: 0~9)
+      mnc: "01" # Mobile Network Code (2 or 3 digits string, digit: 0~9)
   locality: area1 # Name of the location where a set of AMF, SMF and UPFs are located
   pfcp: # the IP address of N4 interface on this SMF (PFCP)
-    addr: 127.0.0.1
+    addr: 192.168.0.141
   userplaneInformation: # list of userplane information
     upNodes: # information of userplane node (AN or UPF)
       gNB1: # the name of the node
         type: AN # the type of the node (AN or UPF)
-      UPF:  # the name of the node
+      I-UPF:  # the name of the node
         type: UPF # the type of the node (AN or UPF)
-        nodeID: 127.0.0.8 # the IP/FQDN of N4 interface on this UPF (PFCP)
+        nodeID: 192.168.0.142 # the IP/FQDN of N4 interface on this UPF (PFCP)
         sNssaiUpfInfos: # S-NSSAI information list for this UPF
           - sNssai: # S-NSSAI (Single Network Slice Selection Assistance Information)
               sst: 1 # Slice/Service Type (uinteger, range: 0~255)
               sd: 010203 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
             dnnUpfInfoList: # DNN information list for this S-NSSAI
               - dnn: internet
-                pools:
-                  - cidr: 10.60.0.0/16
+        interfaces: # Interface list for this UPF
+          - interfaceType: N3 # the type of the interface (N3 or N9)
+            endpoints: # the IP address of this N3/N9 interface on this UPF
+              - 192.168.0.142
+            networkInstance: internet # Data Network Name (DNN)
+          - interfaceType: N9 # the type of the interface (N3 or N9)
+            endpoints: # the IP address of this N3/N9 interface on this UPF
+              - 192.168.0.142
+            networkInstance: internet # Data Network Name (DNN)
+      PSA-UPF1:  # the name of the node
+        type: UPF # the type of the node (AN or UPF)
+        nodeID: 192.168.0.143 # the IP/FQDN of N4 interface on this UPF (PFCP)
+        sNssaiUpfInfos: # S-NSSAI information list for this UPF
           - sNssai: # S-NSSAI (Single Network Slice Selection Assistance Information)
               sst: 1 # Slice/Service Type (uinteger, range: 0~255)
-              sd: 112233 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
+              sd: 010203 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
             dnnUpfInfoList: # DNN information list for this S-NSSAI
               - dnn: internet
                 pools:
-                  - cidr: 10.61.0.0/16
+                  - cidr: 10.60.0.0/16
         interfaces: # Interface list for this UPF
-          - interfaceType: N3 # the type of the interface (N3 or N9)
+          - interfaceType: N9 # the type of the interface (N3 or N9)
             endpoints: # the IP address of this N3/N9 interface on this UPF
-              - 127.0.0.8
+              - 192.168.0.143
             networkInstance: internet # Data Network Name (DNN)
+      PSA-UPF2:
+        type: UPF
+        nodeID: 192.168.0.144
+        sNssaiUpfInfos:
+          - sNssai:
+              sst: 1
+              sd: 010203
+            dnnUpfInfoList:
+              - dnn: internet
+        interfaces:
+          - interfaceType: N9
+            endpoints:
+              - 192.168.0.144
+            networkInstance: internet
     links: # the topology graph of userplane, A and B represent the two nodes of each link
       - A: gNB1
-        B: UPF
+        B: I-UPF
+      - A: I-UPF
+        B: PSA-UPF1
+      - A: I-UPF
+        B: PSA-UPF2
   nrfUri: http://127.0.0.10:8000 # a valid URI of NRF
+  ulcl: true
 
 # the kind of log output
 # debugLevel: how detailed to output, value: trace, debug, info, warn, error, fatal, panic
  • free5gc/config/ausfcfg.yaml
--- ausfcfg.yaml.orig   2022-04-01 20:25:54.000000000 +0900
+++ ausfcfg.yaml        2022-08-12 18:08:52.000000000 +0900
@@ -15,10 +15,8 @@
     - nausf-auth # Nausf_UEAuthentication service
   nrfUri: http://127.0.0.10:8000 # a valid URI of NRF
   plmnSupportList: # the PLMNs (Public Land Mobile Network) list supported by this AUSF
-    - mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-      mnc: 93  # Mobile Network Code (2 or 3 digits string, digit: 0~9)
-    - mcc: 123 # Mobile Country Code (3 digits string, digit: 0~9)
-      mnc: 45  # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+    - mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+      mnc: 01  # Mobile Network Code (2 or 3 digits string, digit: 0~9)
   groupId: ausfGroup001 # ID for the group of the AUSF
   eapAkaSupiImsiPrefix: false # including "imsi-" prefix or not when using the SUPI to do EAP-AKA' authentication
  • free5gc/config/nrfcfg.yaml
--- nrfcfg.yaml.orig    2022-04-01 20:25:54.000000000 +0900
+++ nrfcfg.yaml 2022-04-03 21:57:18.000000000 +0900
@@ -14,8 +14,8 @@
       pem: config/TLS/nrf.pem # NRF TLS Certificate
       key: config/TLS/nrf.key # NRF TLS Private key
   DefaultPlmnId:
-    mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-    mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+    mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+    mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
   serviceNameList: # the SBI services provided by this NRF, refer to TS 29.510
     - nnrf-nfm # Nnrf_NFManagement service
     - nnrf-disc # Nnrf_NFDiscovery service
  • free5gc/config/nssfcfg.yaml
--- nssfcfg.yaml.orig   2022-04-01 20:25:54.000000000 +0900
+++ nssfcfg.yaml        2022-08-16 19:07:55.035859909 +0900
@@ -17,12 +17,12 @@
     - nnssf-nssaiavailability # Nnssf_NSSAIAvailability service
   nrfUri: http://127.0.0.10:8000 # a valid URI of NRF
   supportedPlmnList: # the PLMNs (Public land mobile network) list supported by this NSSF
-    - mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-      mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+    - mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+      mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
   supportedNssaiInPlmnList: # Supported S-NSSAI List for each PLMN
     - plmnId: # Public Land Mobile Network ID, <PLMN ID> = <MCC><MNC>
-        mcc: 208 # Mobile Country Code (3 digits string, digit: 0~9)
-        mnc: 93 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
+        mcc: 001 # Mobile Country Code (3 digits string, digit: 0~9)
+        mnc: 01 # Mobile Network Code (2 or 3 digits string, digit: 0~9)
       supportedSnssaiList: # Supported S-NSSAIs of the PLMN
         - sst: 1 # Slice/Service Type (uinteger, range: 0~255)
           sd: 010203 # Slice Differentiator (3 bytes hex string, range: 000000~FFFFFF)
  • free5gc/config/uerouting.yaml
info:
  version: 1.0.1
  description: Routing information for UE

ueRoutingInfo: # the list of UE routing information
  UE1: # Group Name
    members:
    - imsi-001010000000000 # Subscription Permanent Identifier of the UE
    topology: # Network topology for this group (Uplink: A->B, Downlink: B->A)
    # default path derived from this topology
    # node name should be consistent with smfcfg.yaml
      - A: gNB1
        B: I-UPF
      - A: I-UPF
        B: PSA-UPF1
    specificPath:
      - dest: 172.17.0.0/16 # the destination IP address on Data Network (DN)
        # the order of UPF nodes in this path. We use the UPF's name to represent each UPF node.
        # The UPF's name should be consistent with smfcfg.yaml
        path: [I-UPF, PSA-UPF1]
      - dest: 172.18.0.0/16
        path: [I-UPF, PSA-UPF2]
      - dest: 8.8.8.8/32
        path: [I-UPF]

Changes in configuration files of free5GC 5GC U-Plane (I-UPF)

  • free5gc/config/upfcfg.yaml
--- upfcfg.yaml.orig    2022-08-11 14:42:32.000000000 +0900
+++ upfcfg.yaml 2022-08-15 21:56:44.000000000 +0900
@@ -3,8 +3,8 @@
 
 # The listen IP and nodeID of the N4 interface on this UPF (Can't set to 0.0.0.0)
 pfcp:
-  addr: 127.0.0.8   # IP addr for listening
-  nodeID: 127.0.0.8 # External IP or FQDN can be reached
+  addr: 192.168.0.142   # IP addr for listening
+  nodeID: 192.168.0.142 # External IP or FQDN can be reached
   retransTimeout: 1s # retransmission timeout
   maxRetrans: 3 # the max number of retransmission
 
@@ -13,15 +13,17 @@
   # The IP list of the N3/N9 interfaces on this UPF
   # If there are multiple connection, set addr to 0.0.0.0 or list all the addresses
   ifList:
-    - addr: 127.0.0.8
+    - addr: 192.168.0.142
       type: N3
       # name: upf.5gc.nctu.me
       # ifname: gtpif
+    - addr: 192.168.0.142
+      type: N9
 
 # The DNN list supported by UPF
 dnnList:
   - dnn: internet # Data Network Name
-    cidr: 10.60.0.0/24 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
+    cidr: 10.60.0.0/16 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
     # natifname: eth0
 
 logger: # log output setting

Changes in configuration files of free5GC 5GC U-Plane (PSA-UPF1)

  • free5gc/config/upfcfg.yaml
--- upfcfg.yaml.orig    2022-08-11 14:44:10.000000000 +0900
+++ upfcfg.yaml 2022-08-15 21:57:04.000000000 +0900
@@ -3,8 +3,8 @@
 
 # The listen IP and nodeID of the N4 interface on this UPF (Can't set to 0.0.0.0)
 pfcp:
-  addr: 127.0.0.8   # IP addr for listening
-  nodeID: 127.0.0.8 # External IP or FQDN can be reached
+  addr: 192.168.0.143   # IP addr for listening
+  nodeID: 192.168.0.143 # External IP or FQDN can be reached
   retransTimeout: 1s # retransmission timeout
   maxRetrans: 3 # the max number of retransmission
 
@@ -13,15 +13,15 @@
   # The IP list of the N3/N9 interfaces on this UPF
   # If there are multiple connection, set addr to 0.0.0.0 or list all the addresses
   ifList:
-    - addr: 127.0.0.8
-      type: N3
+    - addr: 192.168.0.143
+      type: N9
       # name: upf.5gc.nctu.me
       # ifname: gtpif
 
 # The DNN list supported by UPF
 dnnList:
   - dnn: internet # Data Network Name
-    cidr: 10.60.0.0/24 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
+    cidr: 10.60.0.0/16 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
     # natifname: eth0
 
 logger: # log output setting

Changes in configuration files of free5GC 5GC U-Plane (PSA-UPF2)

  • free5gc/config/upfcfg.yaml
--- upfcfg.yaml.orig    2022-08-11 14:44:10.000000000 +0900
+++ upfcfg.yaml 2022-10-08 17:54:01.646463594 +0900
@@ -3,8 +3,8 @@
 
 # The listen IP and nodeID of the N4 interface on this UPF (Can't set to 0.0.0.0)
 pfcp:
-  addr: 127.0.0.8   # IP addr for listening
-  nodeID: 127.0.0.8 # External IP or FQDN can be reached
+  addr: 192.168.0.144   # IP addr for listening
+  nodeID: 192.168.0.144 # External IP or FQDN can be reached
   retransTimeout: 1s # retransmission timeout
   maxRetrans: 3 # the max number of retransmission
 
@@ -13,15 +13,15 @@
   # The IP list of the N3/N9 interfaces on this UPF
   # If there are multiple connection, set addr to 0.0.0.0 or list all the addresses
   ifList:
-    - addr: 127.0.0.8
-      type: N3
+    - addr: 192.168.0.144
+      type: N9
       # name: upf.5gc.nctu.me
       # ifname: gtpif
 
 # The DNN list supported by UPF
 dnnList:
   - dnn: internet # Data Network Name
-    cidr: 10.60.0.0/24 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
+    cidr: 10.60.0.0/16 # Classless Inter-Domain Routing for assigned IPv4 pool of UE
     # natifname: eth0
 
 logger: # log output setting

Changes in configuration files of UERANSIM UE / RAN

Changes in configuration files of RAN (gNodeB)

  • UERANSIM/config/free5gc-gnb.yaml
--- free5gc-gnb.yaml.orig       2021-02-11 11:03:28.000000000 +0900
+++ free5gc-gnb.yaml    2022-08-16 19:19:11.333695413 +0900
@@ -1,17 +1,17 @@
-mcc: '208'          # Mobile Country Code value
-mnc: '93'           # Mobile Network Code value (2 or 3 digits)
+mcc: '001'          # Mobile Country Code value
+mnc: '01'           # Mobile Network Code value (2 or 3 digits)
 
 nci: '0x000000010'  # NR Cell Identity (36-bit)
 idLength: 32        # NR gNB ID length in bits [22...32]
 tac: 1              # Tracking Area Code
 
-linkIp: 127.0.0.1   # gNB's local IP address for Radio Link Simulation (Usually same with local IP)
-ngapIp: 127.0.0.1   # gNB's local IP address for N2 Interface (Usually same with local IP)
-gtpIp: 127.0.0.1    # gNB's local IP address for N3 Interface (Usually same with local IP)
+linkIp: 192.168.0.131   # gNB's local IP address for Radio Link Simulation (Usually same with local IP)
+ngapIp: 192.168.0.131   # gNB's local IP address for N2 Interface (Usually same with local IP)
+gtpIp: 192.168.0.131    # gNB's local IP address for N3 Interface (Usually same with local IP)
 
 # List of AMF address information
 amfConfigs:
-  - address: 127.0.0.1
+  - address: 192.168.0.141
     port: 38412
 
 # List of supported S-NSSAIs by this gNB

Changes in configuration files of UE

  • UERANSIM/config/free5gc-ue.yaml
--- free5gc-ue.yaml.orig        2021-09-18 21:11:52.000000000 +0900
+++ free5gc-ue.yaml     2022-08-16 19:20:18.624943349 +0900
@@ -1,9 +1,9 @@
 # IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
-supi: 'imsi-208930000000003'
+supi: 'imsi-001010000000000'
 # Mobile Country Code value of HPLMN
-mcc: '208'
+mcc: '001'
 # Mobile Network Code value of HPLMN (2 or 3 digits)
-mnc: '93'
+mnc: '01'
 
 # Permanent subscription key
 key: '8baf473f2f8fd09487cccbd7097c6862'
@@ -20,7 +20,7 @@
 
 # List of gNB IP addresses for Radio Link Simulation
 gnbSearchList:
-  - 127.0.0.1
+  - 192.168.0.131
 
 # UAC Access Identities Configuration
 uacAic:

Network settings of free5GC 5GC and UERANSIM UE / RAN

Network settings of free5GC 5GC U-Plane (I-UPF)

First, uncomment the next line in the /etc/sysctl.conf file and reflect it in the OS.

net.ipv4.ip_forward=1

# sysctl -p

Next, configure NAPT.

# iptables -t nat -A POSTROUTING -s 10.60.0.0/16 ! -o upfgtp -j MASQUERADE

Network settings of free5GC 5GC U-Plane (PSA-UPF1)

First, uncomment the next line in the /etc/sysctl.conf file and reflect it in the OS.

net.ipv4.ip_forward=1

# sysctl -p

Next, configure NAPT.

# iptables -t nat -A POSTROUTING -s 10.60.0.0/16 ! -o upfgtp -j MASQUERADE

Network settings of free5GC 5GC U-Plane (PSA-UPF2)

First, uncomment the next line in the /etc/sysctl.conf file and reflect it in the OS.

net.ipv4.ip_forward=1

# sysctl -p

Next, configure NAPT.

# iptables -t nat -A POSTROUTING -s 10.60.0.0/16 ! -o upfgtp -j MASQUERADE

Build free5GC and UERANSIM

Note. It is recommended to use go1.18.x according to the commit to free5gc/openapi on 2022.10.26.

Please refer to the following for building free5GC and UERANSIM respectively.

Note. Install MongoDB with package manager on free5GC 5GC C-Plane machine. MongoDB Compass is a convenient tool to look at the MongoDB database.

# apt update
# apt install mongodb
# systemctl start mongodb
# systemctl enable mongodb

It is not necessary to install MongoDB on free5GC 5GC U-Plane machines.

Note. If you want to use the latest committed version, please run the following script to checkout all NFs and Web Console to the latest main branch before building.

#!/usr/bin/env bash

NF_LIST="nrf amf smf udr pcf udm nssf ausf upf n3iwf"

for NF in ${NF_LIST}; do
    cd NFs/${NF}
    git checkout main
    cd ../..
done

cd webconsole
git checkout main

cd ..
git checkout main

Run free5GC 5GC and UERANSIM UE / RAN

First run the 5GC, then UERANSIM (UE & RAN implementation).

Run free5GC 5GC U-Plane (I-UPF & PSA-UPFs)

First, run free5GC 5GC U-Planes. Please see here for the reason.
Note. It was improved on 2022.11.08, and you don't have to worry about the startup order of C-Plane and U-Plane.

  • free5GC 5GC U-Plane (I-UPF)
# cd free5gc
# bin/upf
  • free5GC 5GC U-Plane (PSA-UPF1)
# cd free5gc
# bin/upf
  • free5GC 5GC U-Plane (PSA-UPF2)
# cd free5gc
# bin/upf

Then run tcpdump on one more terminals for U-Plane.

  • Run tcpdump on VM2 (U-Plane (I-UPF))
# tcpdump -i upfgtp -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on upfgtp, link-type RAW (Raw IP), capture size 262144 bytes
  • Run tcpdump on VM3 (U-Plane (PSA-UPF1))
# tcpdump -i upfgtp -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on upfgtp, link-type RAW (Raw IP), capture size 262144 bytes
  • Run tcpdump on VM3 (U-Plane (PSA-UPF2))
# tcpdump -i upfgtp -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on upfgtp, link-type RAW (Raw IP), capture size 262144 bytes

Run free5GC 5GC C-Plane

Next, run free5GC 5GC C-Plane.

  • free5GC 5GC C-Plane

Create the following shell script and run it.

#!/usr/bin/env bash

PID_LIST=()

NF_LIST="amf udr pcf udm nssf ausf"

export GIN_MODE=release

./bin/nrf &
PID_LIST+=($!)
sleep 1

./bin/smf -c config/smfcfg.yaml -u config/uerouting.yaml &
PID_LIST+=($!)
sleep 1

for NF in ${NF_LIST}; do
    ./bin/${NF} &
    PID_LIST+=($!)
    sleep 1
done

function terminate()
{
    sudo kill -SIGTERM ${PID_LIST[${#PID_LIST[@]}-2]} ${PID_LIST[${#PID_LIST[@]}-1]}
    sleep 2
}

trap terminate SIGINT
wait ${PID_LIST}

Run UERANSIM (gNodeB)

Please refer to the following for usage of UERANSIM.

https://github.com/aligungr/UERANSIM/wiki/Usage

# ./nr-gnb -c ../config/free5gc-gnb.yaml
UERANSIM v3.2.6
[2022-10-09 02:01:32.177] [sctp] [info] Trying to establish SCTP connection... (192.168.0.141:38412)
[2022-10-09 02:01:32.180] [sctp] [info] SCTP connection established (192.168.0.141:38412)
[2022-10-09 02:01:32.180] [sctp] [debug] SCTP association setup ascId[5]
[2022-10-09 02:01:32.180] [ngap] [debug] Sending NG Setup Request
[2022-10-09 02:01:32.183] [ngap] [debug] NG Setup Response received
[2022-10-09 02:01:32.183] [ngap] [info] NG Setup procedure is successful

The free5GC C-Plane log when executed is as follows.

2022-10-09T02:01:32+09:00 [INFO][AMF][NGAP] [AMF] SCTP Accept from: 192.168.0.131:48933
2022-10-09T02:01:32+09:00 [INFO][AMF][NGAP] Create a new NG connection for: 192.168.0.131:48933
2022-10-09T02:01:32+09:00 [INFO][AMF][NGAP][192.168.0.131:48933] Handle NG Setup request
2022-10-09T02:01:32+09:00 [INFO][AMF][NGAP][192.168.0.131:48933] Send NG-Setup response

Run UERANSIM (UE)

Ping the following three destination IP addresses and confirm that they are routed through different UPFs.

  • google.com - routing from PSA-UPF1 to Internet
  • 8.8.8.8 - routing from I-UPF to Internet
  • 172.17.0.1 - routing from PSA-UPF1 to 172.17.0.0/16 (Docker network on local)
  • 172.18.0.1 - routing from PSA-UPF2 to 172.18.0.0/16 (Docker network on local)

Note. For example, 172.17.0.0/16 is docker's default network.

Start UE connected to gNodeB

# ./nr-ue -c ../config/free5gc-ue.yaml
UERANSIM v3.2.6
[2022-10-09 02:06:20.191] [nas] [info] UE switches to state [MM-DEREGISTERED/PLMN-SEARCH]
[2022-10-09 02:06:20.191] [rrc] [debug] New signal detected for cell[1], total [1] cells in coverage
[2022-10-09 02:06:20.192] [nas] [info] Selected plmn[001/01]
[2022-10-09 02:06:20.193] [rrc] [info] Selected cell plmn[001/01] tac[1] category[SUITABLE]
[2022-10-09 02:06:20.193] [nas] [info] UE switches to state [MM-DEREGISTERED/PS]
[2022-10-09 02:06:20.194] [nas] [info] UE switches to state [MM-DEREGISTERED/NORMAL-SERVICE]
[2022-10-09 02:06:20.194] [nas] [debug] Initial registration required due to [MM-DEREG-NORMAL-SERVICE]
[2022-10-09 02:06:20.195] [nas] [debug] UAC access attempt is allowed for identity[0], category[MO_sig]
[2022-10-09 02:06:20.195] [nas] [debug] Sending Initial Registration
[2022-10-09 02:06:20.196] [rrc] [debug] Sending RRC Setup Request
[2022-10-09 02:06:20.196] [nas] [info] UE switches to state [MM-REGISTER-INITIATED]
[2022-10-09 02:06:20.196] [rrc] [info] RRC connection established
[2022-10-09 02:06:20.197] [rrc] [info] UE switches to state [RRC-CONNECTED]
[2022-10-09 02:06:20.197] [nas] [info] UE switches to state [CM-CONNECTED]
[2022-10-09 02:06:20.222] [nas] [debug] Authentication Request received
[2022-10-09 02:06:20.231] [nas] [debug] Security Mode Command received
[2022-10-09 02:06:20.232] [nas] [debug] Selected integrity[2] ciphering[0]
[2022-10-09 02:06:20.273] [nas] [debug] Registration accept received
[2022-10-09 02:06:20.273] [nas] [info] UE switches to state [MM-REGISTERED/NORMAL-SERVICE]
[2022-10-09 02:06:20.273] [nas] [debug] Sending Registration Complete
[2022-10-09 02:06:20.273] [nas] [info] Initial Registration is successful
[2022-10-09 02:06:20.274] [nas] [debug] Sending PDU Session Establishment Request
[2022-10-09 02:06:20.274] [nas] [debug] UAC access attempt is allowed for identity[0], category[MO_sig]
[2022-10-09 02:06:20.526] [nas] [debug] PDU Session Establishment Accept received
[2022-10-09 02:06:20.530] [nas] [info] PDU Session establishment is successful PSI[1]
[2022-10-09 02:06:20.553] [app] [info] Connection setup for PDU session[1] is successful, TUN interface[uesimtun0, 10.60.0.1] is up.

The free5GC C-Plane log when executed is as follows.

2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933] Handle Initial UE Message
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [Deregistered] to [Deregistered]
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1] Handle Registration Request
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[Start Authentication], transition from [Deregistered] to [Authentication]
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1] Authentication procedure
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AMF&target-nf-type=AUSF |
2022-10-09T02:06:20+09:00 [INFO][AUSF][UeAuthPost] HandleUeAuthPostRequest
2022-10-09T02:06:20+09:00 [INFO][AUSF][UeAuthPost] Serving network authorized
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AUSF&service-names=nudm-ueau&target-nf-type=UDM |
2022-10-09T02:06:20+09:00 [INFO][UDM][UEAU] Handle GenerateAuthDataRequest
2022-10-09T02:06:20+09:00 [INFO][UDM][Suci] suciPart: [suci 0 001 01 0000 0 0 0000000000]
2022-10-09T02:06:20+09:00 [INFO][UDM][Suci] scheme 0
2022-10-09T02:06:20+09:00 [INFO][UDM][Suci] SUPI type is IMSI
http://127.0.0.10:8000
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=UDM&target-nf-type=UDR |
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle QueryAuthSubsData
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000000/authentication-data/authentication-subscription |
2022-10-09T02:06:20+09:00 [ERRO][UDM][UEAU] opStr length is  0
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle ModifyAuthentication
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 204 |       127.0.0.1 | PATCH   | /nudr-dr/v1/subscription-data/imsi-001010000000000/authentication-data/authentication-subscription |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | POST    | /nudm-ueau/v1/suci-0-001-01-0000-0-0-0000000000/security-information/generate-auth-data |
2022-10-09T02:06:20+09:00 [INFO][AUSF][UeAuthPost] Add SuciSupiPair (suci-0-001-01-0000-0-0-0000000000, imsi-001010000000000) to map.
2022-10-09T02:06:20+09:00 [INFO][AUSF][UeAuthPost] Use 5G AKA auth method
2022-10-09T02:06:20+09:00 [INFO][AUSF][5gAkaAuth] XresStar = 3661383761346561306537353832666336626535636561306135383466653862
2022-10-09T02:06:20+09:00 [INFO][AUSF][GIN] | 201 |       127.0.0.1 | POST    | /nausf-auth/v1/ue-authentications |
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1] Send Authentication Request
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Send Downlink Nas Transport
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Uplink NAS Transport (RAN UE NGAP ID: 1)
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [Authentication] to [Authentication]
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1] Handle Authentication Response
2022-10-09T02:06:20+09:00 [INFO][AUSF][5gAkaAuth] Auth5gAkaComfirmRequest
2022-10-09T02:06:20+09:00 [INFO][AUSF][5gAkaAuth] res*: 3661383761346561306537353832666336626535636561306135383466653862
Xres*: 3661383761346561306537353832666336626535636561306135383466653862
2022-10-09T02:06:20+09:00 [INFO][AUSF][5gAkaAuth] 5G AKA confirmation succeeded
2022-10-09T02:06:20+09:00 [INFO][UDM][UEAU] Handle ConfirmAuthDataRequest
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle CreateAuthenticationStatus
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 204 |       127.0.0.1 | PUT     | /nudr-dr/v1/subscription-data/imsi-001010000000000/authentication-data/authentication-status |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 201 |       127.0.0.1 | POST    | /nudm-ueau/v1/imsi-001010000000000/auth-events |
2022-10-09T02:06:20+09:00 [INFO][AUSF][GIN] | 200 |       127.0.0.1 | PUT     | /nausf-auth/v1/ue-authentications/suci-0-001-01-0000-0-0-0000000000/5g-aka-confirmation |
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[Authentication Success], transition from [Authentication] to [SecurityMode]
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] Send Security Mode Command
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Send Downlink Nas Transport
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Uplink NAS Transport (RAN UE NGAP ID: 1)
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [SecurityMode] to [SecurityMode]
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] Handle Security Mode Complete
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[SecurityMode Success], transition from [SecurityMode] to [ContextSetup]
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] Handle InitialRegistration
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AMF&supi=imsi-001010000000000&target-nf-type=UDM |
2022-10-09T02:06:20+09:00 [INFO][UDM][SDM] Handle GetNssai
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle QueryAmData
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000000/00101/provisioned-data/am-data?supported-features= |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000000/nssai?plmn-id=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] RequestedNssai - ServingSnssai: &{Sst:1 Sd:010203}, HomeSnssai: <nil>
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AMF&supi=imsi-001010000000000&target-nf-type=UDM |
2022-10-09T02:06:20+09:00 [INFO][UDM][UECM] Handle RegistrationAmf3gppAccess
2022-10-09T02:06:20+09:00 [INFO][UDM][UECM] UEID: imsi-001010000000000
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle CreateAmfContext3gpp
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 204 |       127.0.0.1 | PUT     | /nudr-dr/v1/subscription-data/imsi-001010000000000/context-data/amf-3gpp-access |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 201 |       127.0.0.1 | PUT     | /nudm-uecm/v1/imsi-001010000000000/registrations/amf-3gpp-access |
2022-10-09T02:06:20+09:00 [INFO][UDM][SDM] Handle GetAmData
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle QueryAmData
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000000/00101/provisioned-data/am-data?supported-features=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000000/am-data?plmn-id=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-10-09T02:06:20+09:00 [INFO][UDM][SDM] Handle GetSmfSelectData
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle QuerySmfSelectData
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000000/00101/provisioned-data/smf-selection-subscription-data?supported-features= |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000000/smf-select-data?plmn-id=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-10-09T02:06:20+09:00 [INFO][UDM][SDM] Handle GetUeContextInSmfData
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle QuerySmfRegList
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000000/context-data/smf-registrations?supported-features= |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000000/ue-context-in-smf-data |
2022-10-09T02:06:20+09:00 [INFO][UDM][SDM] Handle Subscribe
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle CreateSdmSubscriptions
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 201 |       127.0.0.1 | POST    | /nudr-dr/v1/subscription-data/imsi-001010000000000/context-data/sdm-subscriptions |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 201 |       127.0.0.1 | POST    | /nudm-sdm/v1/imsi-001010000000000/sdm-subscriptions |
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?preferred-locality=area1&requester-nf-type=AMF&supi=imsi-001010000000000&target-nf-type=PCF |
2022-10-09T02:06:20+09:00 [INFO][PCF][Ampolicy] Handle AM Policy Create Request
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=PCF&target-nf-type=UDR |
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle PolicyDataUesUeIdAmDataGet
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/policy-data/ues/imsi-001010000000000/am-data |
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?guami=%7B%22plmnId%22%3A%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D%2C%22amfId%22%3A%22cafe00%22%7D&requester-nf-type=PCF&target-nf-type=AMF |
2022-10-09T02:06:20+09:00 [INFO][AMF][Comm] Handle AMF Status Change Subscribe Request
2022-10-09T02:06:20+09:00 [INFO][AMF][Comm] new AMF Status Subscription[1]
2022-10-09T02:06:20+09:00 [INFO][AMF][GIN] | 201 |       127.0.0.1 | POST    | /namf-comm/v1/subscriptions |
2022-10-09T02:06:20+09:00 [INFO][PCF][GIN] | 201 |       127.0.0.1 | POST    | /npcf-am-policy-control/v1/policies |
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] Send Registration Accept
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Send Initial Context Setup Request
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Handle Initial Context Setup Response
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Uplink NAS Transport (RAN UE NGAP ID: 1)
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [ContextSetup] to [ContextSetup]
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] Handle Registration Complete
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[ContextSetup Success], transition from [ContextSetup] to [Registered]
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Uplink NAS Transport (RAN UE NGAP ID: 1)
2022-10-09T02:06:20+09:00 [INFO][LIB][FSM] Handle event[Gmm Message], transition from [Registered] to [Registered]
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] Handle UL NAS Transport
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] Transport 5GSM Message to SMF
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] Select SMF [snssai: {Sst:1 Sd:010203}, dnn: internet]
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=AMF&target-nf-type=NSSF |
2022-10-09T02:06:20+09:00 [INFO][NSSF][NsSelect] Handle NSSelectionGet
2022-10-09T02:06:20+09:00 [INFO][NSSF][GIN] | 200 |       127.0.0.1 | GET     | /nnssf-nsselection/v1/network-slice-information?nf-id=977ba1f0-04e5-4eba-b020-da9a207382ce&nf-type=AMF&slice-info-request-for-pdu-session=%7B%22sNssai%22%3A%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D%2C%22roamingIndication%22%3A%22NON_ROAMING%22%7D |
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?dnn=internet&preferred-locality=area1&requester-nf-type=AMF&service-names=nsmf-pdusession&snssais=%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D&target-nf-type=SMF&target-plmn-list=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D |
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Receive Create SM Context Request
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] In HandlePDUSessionSMContextCreate
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=SMF&target-nf-type=UDM |
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Send NF Discovery Serving UDM Successfully
2022-10-09T02:06:20+09:00 [INFO][SMF][CTX] Allocated UE IP address: 10.60.0.1
2022-10-09T02:06:20+09:00 [INFO][SMF][CTX] Selected UPF: PSA-UPF1
2022-10-09T02:06:20+09:00 [INFO][UDM][SDM] Handle GetSmData
2022-10-09T02:06:20+09:00 [INFO][UDM][SDM] getSmDataProcedure: SUPI[imsi-001010000000000] PLMNID[00101] DNN[internet] SNssai[{"sst":1,"sd":"010203"}]
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle QuerySmData
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/subscription-data/imsi-001010000000000/00101/provisioned-data/sm-data?single-nssai=%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D |
2022-10-09T02:06:20+09:00 [INFO][UDM][GIN] | 200 |       127.0.0.1 | GET     | /nudm-sdm/v1/imsi-001010000000000/sm-data?dnn=internet&plmn-id=%7B%22mcc%22%3A%22001%22%2C%22mnc%22%3A%2201%22%7D&single-nssai=%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D |
2022-10-09T02:06:20+09:00 [INFO][SMF][GSM] In HandlePDUSessionEstablishmentRequest
2022-10-09T02:06:20+09:00 [INFO][NAS][Convert] ProtocolOrContainerList:  [0xc0001c3ec0 0xc0001c3f00]
2022-10-09T02:06:20+09:00 [INFO][SMF][GSM] Protocol Configuration Options
2022-10-09T02:06:20+09:00 [INFO][SMF][GSM] &{[0xc0001c3ec0 0xc0001c3f00]}
2022-10-09T02:06:20+09:00 [INFO][SMF][GSM] Didn't Implement container type IPAddressAllocationViaNASSignallingUL
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] PCF Selection for SMContext SUPI[imsi-001010000000000] PDUSessionID[1]
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?preferred-locality=area1&requester-nf-type=SMF&target-nf-type=PCF |
2022-10-09T02:06:20+09:00 [INFO][PCF][SMpolicy] Handle CreateSmPolicy
2022-10-09T02:06:20+09:00 [INFO][UDR][DRepo] Handle PolicyDataUesUeIdSmDataGet
2022-10-09T02:06:20+09:00 [INFO][UDR][GIN] | 200 |       127.0.0.1 | GET     | /nudr-dr/v1/policy-data/ues/imsi-001010000000000/sm-data?dnn=internet&snssai=%7B%22sst%22%3A1%2C%22sd%22%3A%22010203%22%7D |
2022-10-09T02:06:20+09:00 [INFO][PCF][GIN] | 201 |       127.0.0.1 | POST    | /npcf-smpolicycontrol/v1/sm-policies |
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] SUPI[imsi-001010000000000] has pre-config route
2022-10-09T02:06:20+09:00 [INFO][NRF][DSCV] Handle NFDiscoveryRequest
2022-10-09T02:06:20+09:00 [INFO][NRF][GIN] | 200 |       127.0.0.1 | GET     | /nnrf-disc/v1/nf-instances?requester-nf-type=SMF&target-nf-instance-id=977ba1f0-04e5-4eba-b020-da9a207382ce&target-nf-type=AMF |
2022-10-09T02:06:20+09:00 [INFO][SMF][Consumer] SendNFDiscoveryServingAMF ok
2022-10-09T02:06:20+09:00 [INFO][SMF][GIN] | 201 |       127.0.0.1 | POST    | /nsmf-pdusession/v1/sm-contexts |
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Establishment Request
2022-10-09T02:06:20+09:00 [INFO][AMF][GMM][AMF_UE_NGAP_ID:1][SUPI:imsi-001010000000000] create smContext[pduSessionID: 1] Success
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Establishment Request
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [4]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Establishment Accepted Response
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [5]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Establishment Accepted Response
2022-10-09T02:06:20+09:00 [INFO][AMF][Producer] Handle N1N2 Message Transfer Request
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Send PDU Session Resource Setup Request
2022-10-09T02:06:20+09:00 [INFO][AMF][GIN] | 200 |       127.0.0.1 | POST    | /namf-comm/v1/ue-contexts/imsi-001010000000000/n1-n2-messages |
2022-10-09T02:06:20+09:00 [INFO][AMF][NGAP][192.168.0.131:48933][AMF_UE_NGAP_ID:1] Handle PDU Session Resource Setup Response
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Receive Update SM Context Request
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] In HandlePDUSessionSMContextUpdate
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Modification Request to AN UPF
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [6]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Modification Accepted Response from AN UPF
2022-10-09T02:06:20+09:00 [INFO][SMF][PFCP] Add PSAAndULCL
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Establish PSA2
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] In EstablishULCL
2022-10-09T02:06:20+09:00 [INFO][SMF][PFCP] [SMF] Establish ULCL msg has been send
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Modification Request
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [7]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Modification Response
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Modification Request
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [8]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Modification Response
2022-10-09T02:06:20+09:00 [INFO][SMF][CTX] [SMF] Add PSA success
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Establish PSA2
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Establishment Request
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [9]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Establishment Accepted Response
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] In EstablishULCL
2022-10-09T02:06:20+09:00 [INFO][SMF][PFCP] [SMF] Establish ULCL msg has been send
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Modification Request
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [10]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Modification Response
2022-10-09T02:06:20+09:00 [INFO][SMF][PFCP] [SMF] Update PSA2 downlink msg has been send
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Modification Request
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [11]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Modification Response
2022-10-09T02:06:20+09:00 [INFO][SMF][CTX] [SMF] Add PSA success
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Establish PSA2
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] In EstablishULCL
2022-10-09T02:06:20+09:00 [INFO][SMF][PFCP] [SMF] Establish ULCL msg has been send
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Sending PFCP Session Modification Request
2022-10-09T02:06:20+09:00 [INFO][LIB][PFCP] Remove Request Transaction [12]
2022-10-09T02:06:20+09:00 [INFO][SMF][PduSess] Received PFCP Session Modification Response
2022-10-09T02:06:20+09:00 [INFO][SMF][CTX] [SMF] Add PSA success
2022-10-09T02:06:20+09:00 [INFO][SMF][GIN] | 200 |       127.0.0.1 | POST    | /nsmf-pdusession/v1/sm-contexts/urn:uuid:f320a1e5-01e0-4916-a7aa-2d134219f713/modify |

The free5GC U-Plane (I-UPF) log when executed is as follows.

2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805] handleSessionEstablishmentRequest
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805][rNodeID:192.168.0.141][SEID:L(0x1),R(0x1)] New session
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805] handleSessionModificationRequest
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805] handleSessionModificationRequest
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805] handleSessionModificationRequest
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.142:8805] handleSessionModificationRequest

The free5GC U-Plane (PSA-UPF1) log when executed is as follows.

2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.143:8805] handleSessionEstablishmentRequest
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.143:8805][rNodeID:192.168.0.141][SEID:L(0x1),R(0x2)] New session
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.143:8805] handleSessionModificationRequest

The free5GC U-Plane (PSA-UPF2) log when executed is as follows.

2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.144:8805] handleSessionEstablishmentRequest
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.144:8805][rNodeID:192.168.0.141][SEID:L(0x1),R(0x3)] New session
2022-10-09T02:06:20+09:00 [INFO][UPF][Pfcp][192.168.0.144:8805] handleSessionModificationRequest

The TUNnel interface uesimtun0 is created as follows.

# ip addr show
...
6: uesimtun0: <POINTOPOINT,PROMISC,NOTRAILERS,UP,LOWER_UP> mtu 1400 qdisc fq_codel state UNKNOWN group default qlen 500
    link/none 
    inet 10.60.0.1/32 scope global uesimtun0
       valid_lft forever preferred_lft forever
    inet6 fe80::dfd9:7b95:b219:ebbb/64 scope link stable-privacy 
       valid_lft forever preferred_lft forever
...

Ping google.com going through PSA-UPF1

Confirm by using tcpdump that the packet goes through if=upfgtp on U-Plane (PSA-UPF1).

# ping google.com -I uesimtun0 -n
PING google.com (142.251.42.206) from 10.60.0.1 uesimtun0: 56(84) bytes of data.
64 bytes from 142.251.42.206: icmp_seq=1 ttl=61 time=20.6 ms
64 bytes from 142.251.42.206: icmp_seq=2 ttl=61 time=19.5 ms
64 bytes from 142.251.42.206: icmp_seq=3 ttl=61 time=20.0 ms

The tcpdump log on U-Plane (PSA-UPF1) is as follows.

02:13:30.649127 IP 10.60.0.1 > 142.251.42.206: ICMP echo request, id 10, seq 1, length 64
02:13:30.666817 IP 142.251.42.206 > 10.60.0.1: ICMP echo reply, id 10, seq 1, length 64
02:13:31.650460 IP 10.60.0.1 > 142.251.42.206: ICMP echo request, id 10, seq 2, length 64
02:13:31.667513 IP 142.251.42.206 > 10.60.0.1: ICMP echo reply, id 10, seq 2, length 64
02:13:32.652233 IP 10.60.0.1 > 142.251.42.206: ICMP echo request, id 10, seq 3, length 64
02:13:32.669327 IP 142.251.42.206 > 10.60.0.1: ICMP echo reply, id 10, seq 3, length 64

Note. Make sure that the packets are not routed from I-UPF & PSA-UPF2 to the Internet.

Ping 8.8.8.8 going through I-UPF

Confirm by using tcpdump that the packet goes through if=upfgtp on U-Plane (I-UPF).

# ping 8.8.8.8 -I uesimtun0 -n
PING 8.8.8.8 (8.8.8.8) from 10.60.0.1 uesimtun0: 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=61 time=14.7 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=61 time=10.9 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=61 time=11.1 ms

The tcpdump log on U-Plane (I-UPF) is as follows.

02:16:32.390218 IP 10.60.0.1 > 8.8.8.8: ICMP echo request, id 11, seq 1, length 64
02:16:32.402865 IP 8.8.8.8 > 10.60.0.1: ICMP echo reply, id 11, seq 1, length 64
02:16:33.392243 IP 10.60.0.1 > 8.8.8.8: ICMP echo request, id 11, seq 2, length 64
02:16:33.401159 IP 8.8.8.8 > 10.60.0.1: ICMP echo reply, id 11, seq 2, length 64
02:16:34.394279 IP 10.60.0.1 > 8.8.8.8: ICMP echo request, id 11, seq 3, length 64
02:16:34.403131 IP 8.8.8.8 > 10.60.0.1: ICMP echo reply, id 11, seq 3, length 64

Note. Make sure that the packets are not routed from PSA-UPFs to the Internet.

Ping 172.17.0.1 going through PSA-UPF1

Confirm by using tcpdump that the packet goes through if=upfgtp on U-Plane (PSA-UPF1).

# ping 172.17.0.1 -I uesimtun0 -n
PING 172.17.0.1 (172.17.0.1) from 10.60.0.1 uesimtun0: 56(84) bytes of data.
64 bytes from 172.17.0.1: icmp_seq=1 ttl=64 time=1.77 ms
64 bytes from 172.17.0.1: icmp_seq=2 ttl=64 time=2.59 ms
64 bytes from 172.17.0.1: icmp_seq=3 ttl=64 time=3.05 ms

The tcpdump log on U-Plane (PSA-UPF1) is as follows.

02:18:42.810150 IP 10.60.0.1 > 172.17.0.1: ICMP echo request, id 12, seq 1, length 64
02:18:42.810233 IP 172.17.0.1 > 10.60.0.1: ICMP echo reply, id 12, seq 1, length 64
02:18:43.811991 IP 10.60.0.1 > 172.17.0.1: ICMP echo request, id 12, seq 2, length 64
02:18:43.812076 IP 172.17.0.1 > 10.60.0.1: ICMP echo reply, id 12, seq 2, length 64
02:18:44.813490 IP 10.60.0.1 > 172.17.0.1: ICMP echo request, id 12, seq 3, length 64
02:18:44.813721 IP 172.17.0.1 > 10.60.0.1: ICMP echo reply, id 12, seq 3, length 64

Note. Make sure that the packets are not routed from I-UPF & PSA-UPF2 to anywhere.

Ping 172.18.0.1 going through PSA-UPF2

Confirm by using tcpdump that the packet goes through if=upfgtp on U-Plane (PSA-UPF2).

# ping 172.18.0.1 -I uesimtun0 -n
PING 172.18.0.1 (172.18.0.1) from 10.60.0.1 uesimtun0: 56(84) bytes of data.
64 bytes from 172.18.0.1: icmp_seq=1 ttl=64 time=1.91 ms
64 bytes from 172.18.0.1: icmp_seq=2 ttl=64 time=2.86 ms
64 bytes from 172.18.0.1: icmp_seq=3 ttl=64 time=2.59 ms

The tcpdump log on U-Plane (PSA-UPF2) is as follows.

02:22:00.557788 IP 10.60.0.1 > 172.18.0.1: ICMP echo request, id 13, seq 1, length 64
02:22:00.557875 IP 172.18.0.1 > 10.60.0.1: ICMP echo reply, id 13, seq 1, length 64
02:22:01.559519 IP 10.60.0.1 > 172.18.0.1: ICMP echo request, id 13, seq 2, length 64
02:22:01.559605 IP 172.18.0.1 > 10.60.0.1: ICMP echo reply, id 13, seq 2, length 64
02:22:02.561204 IP 10.60.0.1 > 172.18.0.1: ICMP echo request, id 13, seq 3, length 64
02:22:02.561292 IP 172.18.0.1 > 10.60.0.1: ICMP echo reply, id 13, seq 3, length 64

Note. Make sure that the packets are not routed from I-UPF & PSA-UPF1 to anywhere.

Using ULCL, I was able to confirm the very simple configuration for controlling the communication path to specific destination IP addresses. I would like to thank the excellent developers and all the contributors of free5GC and UERANSIM.

Changelog (summary)

  • [2022.10.09] Initial release.

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free5GC 5GC & UERANSIM UE / RAN Sample Configuration - ULCL with one I-UPF and two PSA-UPFs

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smf stand-alone amf upf 5g ue ran 5gc free5gc ueransim gnodeb ulcl

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