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[OT] Interesting Windows IP issue

On 01/23/2011 02:23 AM, David Kramer wrote:
> On 01/22/2011 03:32 PM, Jerry Feldman wrote:
>> On 01/22/2011 03:21 PM, Mark Komarinski wrote:
>>> 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=
>>>> 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 =
>>>> a valid 10. address. We moved to another office because the lighting=
>>>> better, and the same thing. We even rebooted his computer. Somehow i=
>>>> 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 th=
>>>> thing up and running on the corporate network. Note that I had even =
>>>> a IPCONFIG /release and IPCONFIG /renew. I've seen this before on hi=
>>>> previous laptop. Apparently he does something at home, but when I lo=
>>>> at properties it shows DHCP.
>>> Use ipconfig /all to verify that a lease is actually getting assigned=
=2E =20
>>> If it is, you may have a rogue DHCP server on your hands.
>> This has happened before on his previous laptop. I think it has to do
>> with the way he configured it. No one else has the same problem.
> OK, here's a crazy theory.  Windows sometimes tries to "bridge" etherne=
> devices so they look as one device, whether you're using wireless or
> wired.  Maybe it does this via its own nat?
Could be. I didn't have the time to sit down any analyze.

Jerry Feldman <gaf-mNDKBlG2WHs at>
Boston Linux and Unix
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