Advanced API (2)

• Additional

  • PMTU discovery
    • IPV6_USE_MIN_MTU (like IPV6_MTU)
      • disable for multicast (default) / always / disable
  • Fragmentation
    • IPV6_DONTFRAG
  • PMTU notification / query
    • IPV6_RECVPMTU, IPV6_PMTU
    • sockets w/ IPV6_RECVPMTU receives PMTU information for all destinations
    • check current PMTU by IPV6_PMTU (connected socket)