My 2821 router has an arp table with the wrong ip to Mac mappings. The impact is that I can reach any host in the 10.1.1.1 subnet. I can reach hosts in the 192.168.35.0 just fine.
Ip address 10.1.1.1 255.255.255.0
Ip address 192.168.35.2 255.255.255.0 secondary
The router arp table has this info
10.1.1.1 Mac d43d
192.168.35.2 Mac bb33
192.168.35.1 Mac 78ab
10.1.1.2 Mac 78ab
10.1.1.3 Mac 78ab
10.1.1.4 Mac 78ab
10.1.1.5 Mac 78ab
10.1.1.21 Mac 78ab
Any ideas what is going on? It is as if the 192.168.35.1 device is answering all arp requests as a proxy arp or something.
Clear arp-cache nor clear ip arp on my 2821 have any affect.
I ended up working around the problem by creating a separate vlan for both subnets and not having secondary addressing. Now things seem to work as expected.
Sent from Cisco Technical Support iPad App
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: