[OT] Interesting Windows IP issue

[Mark Komarinski]

On 1/22/2011 10:30 AM, Jerry Feldman wrote:
> Yesterday at work, one of my coworkers wanted to make a presentation
> from his company laptop (Windows XP). For some reason his IP address was
> showing 192.168.x.x, not the internal company 10. address. I used my
> Ubuntu netbook to make sure the CAT5E cable was ok, and I certainly got
> a valid 10. address. We moved to another office because the lighting was
> better, and the same thing. We even rebooted his computer. Somehow it
> wanted to remain at 192.168. Our cables are plugged directly into a
> switch that plugs into our firewall. After a while we finally got the
> thing up and running on the corporate network. Note that I had even done
> a IPCONFIG /release and IPCONFIG /renew. I've seen this before on his
> previous laptop. Apparently he does something at home, but when I look
> at properties it shows DHCP.
>
Use ipconfig /all to verify that a lease is actually getting assigned.  
If it is, you may have a rogue DHCP server on your hands.

-Mark