Duplicate IP error when there is no Duplicate IP

Windows Server 2003, Active Directory, no DHCP, one 100 card and one Gigabit
card.

The gigabit used to have a different ip scheme, for connecting to the
clients old system. The 100 card was configured with the new IP scheme.
(10.0.0.5). We wanted to switch, so the Gigabit card was serving the new
network instead. Disabled the 100 card, and gave 10.0.0.5 to the GB card. Got
a duplicate IP error. Tried uninstalling the 100 card. Same duplicate IP
errors.

We have scanned the network, and there is no other 10.0.0.5 on. This only
happens with the GB card.

Any Ideas greatly appreciated!

 

In Device Manager, click View and select Show hidden devices. Perhaps the
old adapter is still listed.

Doug Sherman
MCSE Win2k/NT4.0, MCSA, MCP+I, MVP

 

Thanks, but that didn't help. I just tried removing and reinstalling both
network cards. After I rebooted, they were automatically detected and
installed, with DHCP enabled. I set a static address for the GB card
10.0.0.5, and got the confilict again. I checked event viewer and found that
the MAC address of the offending 'device' matched the 100 card, which was
currently listed as having an ip of 0.0.0.0. Noting i do seems to be able to
cause the 100 card to release this address...

Another problem that may or me not be related, is this: Every computer on
the local network can ping internet ip addresses BUT this server. All IP
settings are the same on the server as the clients. We ruled out routing
problems at the firewall (Cisco firewall appliance), since the clients aren't
having this problem.

I'm also apparently having DNS problems... Sorry I don't know if this stuff
is related...

*** Can't find server name for address 10.0.0.5: No response from server
Default Server: UnKnown
Address: 10.0.0.5

Thanks,

acorn

 

If you go to regedit - HKLM\system\currentcontrolset\control\network, is the
old NIC still showing up in there? Dig around....

Sounds indeed like it is.

 

Have you found answer about your questions?
i have had the same.

 

I have not yet found a solution for the duplicate ip's.. However, as far as
pinging the internet, there was, indeed a problem with the firewall routing
tables. There was a static route set to allow RDP from an external address to
the W2k3 server. Taking this route out solved that problem. It also, at least
partially, solved my DNS problems.

 

I see entries for "Local Area Connection". 8 or 9 of them. So apparently,
this may be where it's getting stuck.. However I don't see anywhere in the
registry referring to the 10.0.0.5 address. Is it safe to delete the keys for
all "Local Area Connection"s I know i'm not using?

Thanks again,

acorn

 

Yes - I'd back them up first to a reg file, tho. And uninstall the card
first, then do this. Then reinstall the card.