From: Vladimir Sousa (vladrac@gmail.com)
Date: Thu Nov 22 2007 - 15:00:04 ART
Ive seen this on switches 3550s and 4506s already.
but Im not sure if this is IOS specific.
Vlad
On 11/19/07, Bob Sinclair <bob@bobsinclair.net> wrote:
>
> Group:
>
> When asked to discover the subnet on an attached FastEthernet Interface
> I usually guess an IP and turn on debug ip packet, hoping to see some
> broadcast traffic, or traffic for an enabled protocol.
>
> Lately I have seen the following technique, and could use your input:
>
> Guess an IP address, turn on debug arp, and ping 255.255.255.255. In a
> context using 2811s running 12.4 code, I saw an ARP "wrong wire"
> message with the source address of another router on the subnet.
>
> This would be cool in a lab situation because it would seem not to rely
> on any special configuration on either router.
>
> But I cannot get this to work on a 3640 with 12.4 code and no longer
> have access to the 2811s. Any ideas what is going on? Have you seen
> this arp "wrong wire" message sent? Is it IOS or platform specific? I
> checked Google and likely arp commands in the Doc CD, but didn't see
> anything helpful.
>
> Thanks!
> --
>
>
> Bob Sinclair CCIE 10427 CCSI 30427
> www.netmasterclass.net
>
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