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New Member

bogus arp table contents

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 subnet. I can reach hosts in the just fine.

Int g0/0

Ip address

Ip address secondary

The router arp table has this info Mac d43d 32da Mac bb33 Mac 78ab Mac 78ab Mac 78ab Mac 78ab Mac 78ab

... Mac 78ab

Any ideas what is going on? It is as if the 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.

  • LAN Switching and Routing
New Member

Re: bogus arp table contents

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.

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