problems with ARP

Unanswered Question
Aug 31st, 2008


I have a cisco 1720 - C1700-NO3SY7-M), Version 12.2(8)T10 - in which Ethernet port I have a wireless Ethernet connection to get a server in a remote site.

The problem is that I have to do "clear arp" in the router sometimes because the server cannot communicate to the external site.

Do you know what can I do to solve this problem?

I have this problem too.
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Giuseppe Larosa Sun, 08/31/2008 - 21:51

Hello William,

you should provide some more details.

Post a filtered version of your router configuration.

However, if you want you can try to add a static ARP in your router for the server's MAC address and IP to see if this fixes your problem.

the command should be:

arp 001d.1234.5678 arpa

However, if the arp entry in the router gets corrupted it can be a sign that some other device is on the wireless lan and can be sending gratuitos ARPs or be acting as a proxy-arp.

Hope to help


william.tituana Mon, 09/01/2008 - 11:16

Thanks Giuseppe,

I did what you suggested, but the problem is still present.

I'm trying now using the comand "arp timeout 1200" to avoid doing a "clear arp" manually.

I'll tell you if this works.



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