Le 16/04/2010 17:11, Suresh Krishnan a écrit :
Hi Niviya,
On 10-04-16 04:18 AM, niviya vijayan wrote:
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.
It is very strange that you see a join for the all nodes multicast
address. Nodes don't have to send a MLD join for the link-local
all-nodes multicast address and I have never seen an implementation that
does this. What I would expect is 2 MLD (listener report) joins
1) MLD join for the solicited node multicast address from the
unspecified address (to test for the uniqueness of the tentative
link-local address).
2) MLD join for the solicited node multicast address from the link-local
address.
Strange, what I see is an exclude filter... I have to think what's left
if the excluded things go away.
Alex
Cheers
Suresh
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