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How do I fix bad MAC address for server in ARP cache?

The Windows 7 machines in my office have been losing connectivity with the server for the last few days. ChiefIT brilliantly suggested that ARP resolution might be the issue. Sure enough, when one of my Windows 7 machines can ping the server, the MAC address it has for the server in its ARP cache is correct. And sure enough, when one of my Windows 7 machines cannot ping the server, the MAC address it has for the server in its ARP cache is wrong. In fact, the MAC address it shows in the ARP cache is the MAC address for the gateway. Suggestions on how to fix this?

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Subhashish Laha

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SOLUTION

BCipollone

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jdana

ASKER

Okay subhashishlaha,

I did a flush (netsh interface ip delete arpcache) on the Windows 7 client and pinged the server again. The client's ARP cache again filled with MAC address of the gateway instead of the MAC address of the server.

I then did a flush on both client and server. This time, the ping from client to server was successful and ping from server to client was successful. I check both ARP caches at this point and the values were correct.

So, did I resolve the issue? Or is there something else lurking out there that's going to make the issue rear up again?

J

Subhashish Laha

I dont think at this point this should come up again.

If it is in future, we are here to assist you :)

jdana

ASKER

I flushed the cache on the problem server and computers, and all seemed well for about an hour. Then inexplicably, the bad MAC addresses started creeping back in. What is causing this. Ahhhg!

SOLUTION