From: Todd, Douglas M. (DTODD@PARTNERS.ORG)
Date: Wed Apr 11 2007 - 10:51:32 ART
Hello:
If you sniff on the cisco MAC of the hsrp address this will tell you what
devices are using that as the gw. The other ways:
ACL and log on only physical ip address.
sniff on the physical mac address only. Thus finding the devices that are using
the interface and not the hsrp address.
grab arp traffic (gives you roughly the same thing).
Depending on whether you can get a hard down time you could:
1) shutdown the other interface have hsrp transistion
2) change the ip address of the phyical interface
3) ping sweep and see what devices respond
4) activate the default gw ip
5) ping sweep and see what responds
6) repeat on the other router.
I would look at doing a trace..
DMT
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Ian
Blaney
Sent: Wednesday, April 11, 2007 9:37 AM
To: ccielab@groupstudy.com
Subject: HSRP - Default Gateway
Hello All
This is a real life question but is hopefully related to your studies.
I am looking for a way to find out what the clients PC default gateway address
is without physically going to each PC. Some clients are using the physical IP
address and not the virtual HSRP IP address. I would like to find out what
clients are using the physical IP address and change it to the virtual address.
Does anyone have an idea. I am thinking around the idea of a ping sweep of the
subnet and sniffing the replies but not sure if this would give me what I want.
Regards
Ian Blaney
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