I have a Cisco router trying to communicate to a remote host on the Internet through our gateway Router. Both routers are on the same subnet. We kept having intermittent communication issues. During our troubleshooting, we noticed that the ARP table entry for the gateway router on the internal router kept showing it as "INCOMPLETE".
The only thing that would fix it would be performing a "CLEAR ARP" on the router.
Why would there be ARP issues between Routers on the same subnet? Is there a setting on the router that I need to verify/change on the interface of router ? Anyone else ever have this problem?