Multicast Interfaces


How to identify a network interface for multicasting
IPv4 implementations use a unicast address.
natural because one and only one IPv4 address is assigned on each network interface.
Unicast addresses are not suitable for IPv6:
An IPv6-capable node may assign multiple addresses on a single interface.
Using addresses as interface identifiers tends to cause configuration mismatches.
Link-local addresses are not necessarily unique in a node.
KAME's approach: always use interface names or indices.
in the kernel, applications, APIs