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README.md
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config.boot.erl
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config.boot.poe
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config.gateway.json
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README.md

Comcast Xfinity Dual Stack (IPv4 + IPv6) EdgeRouter Example config.boot Files

These files are example config.boot configuration files that can be be loaded on a factory-default Ubiquiti EdgeRouter Lite (ERLite-3) or EdgeRouter POE (ERPOE-5) to enable dual-stack IPv4 & IPv6 networking on residential Comcast Xfinity networks.

  • config.boot.erl - Comcast Xfinity configuration file for EdgeRouter Lite
  • config.boot.erx - Comcast Xfinity configuration file for EdgeRouter X
  • config.boot.poe - Comcast Xfinity configuration file for EdgeRouter POE
  • config.gateway.json - JSON-formatted file for UniFi Security Gateway (runs EdgeOS)

Port Settings

The default port/interface settings for each version of the example Comcast Xfinity config.boot files are:

###Comcast config.boot.erl####

  • eth0 = WAN (Cable Modem)
  • eth1 = Local Config Port
  • eth2 = LAN

###Comcast Fiber config.boot.erx####

  • eth0 = WAN (Cable Modem)
  • eth1, eth2, eth3, & eth4 = LAN (combined as switch0)

###Comcast config.boot.poe####

  • eth0 = WAN (Cable Modem)
  • eth1 = Local Config Port
  • eth2, eth3, eth4 = LAN (combined as switch0)

###Comcast config.gateway.json####

  • eth0 = WAN (Cable Modem)
  • eth2 = LAN

For all the files, eth0 is always the WAN interface and eth2 is always a valid LAN port to use during testing.

Usage

Copy the raw contents of the appropriate config.boot file into your local clipboard. Then create a blank config.boot file in /home/ubnt with:

$ sudo vi /home/ubnt/config.boot

Once inside the vi editor, turn off the auto-indenting feature before you paste by typing

:set noai

and pressing ENTER. If you’re not familiar with vi, make sure you type the : whenever they’re shown in this guide.

Now enter “insert” mode by pressing lowercase i (you don’t need ENTER after the i command).

Paste the copied raw config.boot file from your local system’s clipboard using your terminal client’s Paste menu item or keyboard shortcut (usually CTRL-V on PC, Command-V on Mac, etc.). Now write and quit the file by typing:

:wq

and then ENTER.

Now you’re ready to copy your new config.boot file over the EdgeRouter’s default config.boot file with:

$ sudo cp /home/ubnt/config.boot /config/config.boot

You can apply the new config.boot file by rebooting the router with the reboot command, or with:

$ configure
# load
# commit
# save
# exit

UniFi Security Gateway (USG) Usage

Following the instructions in this guide to learn more about how to apply the settings in the included config.gateway.json file to a USG via the UniFi Controller:

https://help.ubnt.com/hc/en-us/articles/215458888-UniFi-How-to-further-customize-USG-configuration-with-config-gateway-json

Be extremely careful when creating or editing a config.gateway.json file, as including malformed configuration options in a config.gateway.json file can lead to a provisioning loop. This is considered an advanced configuration option.

Comcast Xfinity IPv6 Considerations

Based on the most recent IPv6 information from Comcast, residential customers should be requesting IPv6 addressing with a prefix length of /60 (which is what is used in these examples). Commercial customers should use a prefix length of /56.

If you edit the IPv6 settings in your config.boot and want to apply them immediately, do:

$ release dhcpv6-pd interface eth0
$ delete dhcpv6-pd duid 
$ renew dhcpv6-pd interface eth0

Change eth0 as needed to match your configuration's WAN interface.

Test IPv6 Connectivity

Test your connection for IPv6 support by visiting these websites: