Hi ,
I have a query regarding the interface initialization process for an ipv6
enabled interface.
As per the RFC4861, the node has to join
a. All-node multicast address{FE02::1}
b. Solicited multicast address {FF02::1:ff00:<last 24 bits of
ipaddress>}
I have tried capturing packets for one of the switch while configuring an
ipv6 address. I could see IPv6 node (Ipv6 address) joining ‘All node
multicast address’ and ‘Solicited multicast address’. Apart from that I am
seeing an extra join request from the Link Local address to the ‘All node
multicast address’. Any specific reason for this? Is this a correct
behaviour ?or is there any requirement for joining link local address on the
all node multicast node while creating an ipv6 address on the interface? why
it is required? if it is required, then this message will repeat for each &
every ipv6 address created on an interface since it has only one link-local
address.
I havent seen anywhere RFC taking about this. please help me to understand
this behaviour.
RFC 4861 Statement:- 7.2.1.Interface Initialization
“When a multicast-capable interface becomes enabled, the node MUST join the
all-nodes multicast address on that interface, as well as the solicited-
node multicast address corresponding to each of the IP addresses assigned
to the interface.”
Thnaks & Regards,
Niviya
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