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NOTES.md

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  • Link aggregation :

    • Aggregating LAN ports of the modem to make it Gbps ???

  • For bridging EoIP ( ehternet over IP ) can be used, it encapsulates L2 packets with overhead of 42 bytes.

Tunnels

  • Tunnels in the kernel:
    • IPIP
      • Incapsulate only IPv4 unicast. No multicast
      • Less overhead in performance
      • Can setup only 1 tunnel for one endpoint pair
      • Overhead of 20 bytes
      • Contain 2 IP headers
      • Packet acknnowledgement available like TCP
      • Less secure
    • GRE
      • Incapsulate IPv4/IPv6 unicast and multicast.
      • de-facto tunnel used for dynamic routed networks
      • 64K tunnels for a unique tunnel endpoint
      • overhead of 24 bytes
      • No packet acknowledgement, behaves like raw socket/ UDP.
      • More secure but not much secure, uses checksum only.
    • SIT
      • IPv6 over IPv6
      • Not much interested in this

IMPORTANT : Since tunneling involves overhead, MTU size is affected so for that MSS has to be reeduced to prevent IP fragmentation that causes network issues, its better to use security mechanism like IPSec together with it.

  • Userland Kernels: