I have a cisco 6500 that i configured a /64 on int1/39 that has a linux server connected to it and supressed RAs. On this server i assigned a static ip,
2001:x:77:4::2. i can ping to/from the server with no issues. However when doing a show ipv6 neighbors i still see the auto config ipv6 on fast1/39.
ip address x.x.x.33 255.255.255.240
ip flow ingress
ipv6 address 2001:x:77:4::1/64
ipv6 nd ra suppress
spanning-tree portfast edge
My question why is that attached server getting an auto config ipv6 address when i have the supress command under interface. Also is it correct to assign a /64 to an int/vlan and statically assign ips instead or should i move to a /56. I'm not really sure if what im doing is common or if it create issues.
Deepak, while i assigned a static ip to the server doing a show ipv6 neighbor shows this static ip and it also shows the auto config ip. Again based on my config above shouldnt it jsut show the static ip. Why is SLAAC in play here if i have
ipv6 nd ra suppress on the interface, will this setup cause issues.
sh ipv6 neighbors
IPv6 Address Age Link-layer Addr State Interface
2001:x:77:4::2 1 0019.b9e6.5647 STALE Fa1/39
2001:x:77:4:219:B9FF:FEE6:x 49 0019.b9e6.5647 STALE Fa1/39
FE80::219:B9FF:FEE6:5647 1 0019.b9e6.5647 STALE Fa1/39
note i can ping the static and auto config ip and the server lists both of them.
Paul, this behaviour is not normal. Both IP's are from the same subnet though. We are not sure if this autoip is assigned out of SLAAC. The only way is to find this out by removing the server IP address and assign the static IP again using "debug ipv6 nd" / "debug ipv6 packet" to capture the packets.
I am trying to set this in the lab and let you know the results soon.
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