Ghost IP Address

Unanswered Question
Apr 26th, 2005
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I just took over a LAN/WAN structure and this is

something that I've never seen before.

When pinging across these two subnets, I'm getting

an extra IP address for the main router:

Main Office: (c3620)


Serial1/1: <<---PPP to

Remote Office:(c1601)


Serial0: <----PPP to

Starting in the main office's subnet, I'm pinging: <---where is this coming from?!?!??

However, when doing a tracroute to an IP in the, the IP does not show up.

If I telnet to this address (, I get the

logon prompt for the main router.

Why is this happening?



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tekha Wed, 04/27/2005 - 05:18
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Is the WAN subneted? if yoy have subneted to /30, then .3 is your broadcast address, that might explain my you receive an answer on that ping.

stephtchoko Wed, 04/27/2005 - 05:36
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I have a same problem in my network.One ip address which is assigned to pix, are localised to switch and create a conflict and disturb our network.When we reboot the switch it disappear and after it appear again.

I think it is a ghorst ip address.How we can resovl it ?

Best regards.


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