Hi,
I'm curious to find out what goes on as far as communications between a local host and a router is concerned when the arp cache of a router has two instances of the same MAC address but different IP address. What would happen to local hosts wanting to go out to the internet?
sho arp
...
Internet 172.20.20.2 2 0001.64ff.ce99 ARPA
Internet 172.20.20.3 3 0001.64ff.ce99 ARPA
Recently i replaced a faulty primary firewall (172.20.20.2) with the backup firewall (172.20.20.3). The backup firewall, after rebooting, assumed the primary role which resulted in a new IP address of 172.20.20.2 (but new MAC). This resulted in the anomaly of the arp cache. Right now no traffic is allowed in or out of the new PIX. I assume it's because of the above arp problem. Hopefully a clear arp-cache will resolve the issue.
Thanks,
Mavin