Ghost IP Address

Unanswered Question
Apr 26th, 2005

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)

Eth0: 10.0.0.1

Serial1/1: 10.0.5.2 <<---PPP to 10.0.5.1

Remote Office:(c1601)

Eth0:10.0.6.1

Serial0: 10.0.5.1 <----PPP to 10.0.5.2

Starting in the main office's subnet, I'm pinging:

10.0.0.1

10.0.5.2

10.0.5.1

10.0.5.3 <---where is this coming from?!?!??

10.0.6.1

However, when doing a tracroute to an IP in the

10.0.6.0, the 10.0.5.3 IP does not show up.

If I telnet to this address (10.0.5.3), I get the

logon prompt for the main router.

Why is this happening?

TIA,

Mark

I have this problem too.
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tekha Wed, 04/27/2005 - 05:18

Is the WAN subneted? if yoy have subneted 10.0.5.0 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

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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Posted April 26, 2005 at 11:59 PM
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