If you cannot telnet to the router, there is a possibility that a
"gratuitous arp" may do the trick. If the router recognizes these kinds of
arp packets it should update its cache. The broadcasted arp will have the
same source and destination Ip address and the new source MAC address. It is
used primarily to check if another node had the source's IP address. In fact
you might not have to do anything to change it. The act of putting the Ip on
a different NIC may generate the gratuitous arp. If not, try to find a way
to generate the special arp from the new station.
Winston.
-----Original Message-----
From: Fred Ingham [mailto:[EMAIL PROTECTED]]
Sent: Sunday, November 19, 2000 7:56 PM
To: Hinds, Jarrett (contractor); [EMAIL PROTECTED]
Subject: Re: Kinda OT - ARP Question
You could just enter "clear arp" this will force a refresh. If you
want to totally clear an entry shut/no shut the interface it was
learned on. Of course, make sure this isn't the interface you are using
for your telnet session |:)
Fred.
"Hinds, Jarrett (contractor)" wrote:
>
> I believe, by default, the timeout for ARP on a 3640 is four hours. I was
> wondering if there is anyway to force an update of this ARP table without
> having access to the router to manually clear the table. Would pinging
the
> router from a box with the same IP address, but different MAC do the
trick?
> Or do I have to wait the four hours for a timeout?
>
> Thanks,
>
> Jarrett
>
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