New Socket Options

• IPV6_UNICAST_HOPS

  • Controls the hop limit used in outgoing unicast IPv6 packets

• IPV6_MULTICAST_IF

  • Set the interface to use for outgoing multicast packets

• IPV6_MULTICAST_HOP

  • Set the hop limit to use for outgoing multicast packets
  • Default: 1

• IPV6_MULTICAST_LOOP

  • Loopback a copy of the datagram if the host itself joins the destination group of the outgoing multicast packet.
  • Default: 1

• IPV6_JOIN_GROUP / IPV6_LEAVE_GROUP

  • Joint / Leave a multicast group on a specified local interface
  • Note: New IGMPv3/MLDv2 Interface is also available

• IPV6_V6ONLY

  • Restricts AF_INET6 sockets to IPv6 communication only
  • Default: 0
    • Note: on some systems, default is 1.

Notes: