server with fixed IP keeps showing up in dns with dhcp address

[bookouri]

I have a server with a network card configured with a fixed IP address. About an hour after I configured the card i couldnt get to the server. I checked DNS and found a host record for the server showing it with one of our dhcp addresses. The server NIC has not been reconfigured. I checked it and it was still set with the proper fixed address. I then went to each of our dns servers and manually deleted the incorrect host record, and manually added the correct host/ip address record, but after a while the host had once again been changed to a dhcp address. Anybody have any idea what might be going on here? It should be pretty simple, I have one nic connected and it is configured for a static IP. Where is DNS getting this bogus IP address??

thanks for any suggestions

 

[58sniper]

Maybe you have another host on the network that's got the same name? I'd think you'd see more issues that just what you have, though.

Pat Richard MVP
Plan for performance, and capacity takes care of itself. Plan for capacity, and suffer poor performance.

http://www.ucblogs.net/blogs/exchange/

 

[bookouri]

nope no other host with the same name.

 

[Lemon13]

take it of the domain, delete the computer account in ad, rejoin

M. Knorr

MCSE, MCTS, MCSA, CCNA

 

[bookouri]

Im hesitant to try too much of that at this point. This is a production server configured as an application server and uses some applications that i dont know much about. The applications were installed and configured by a vendor. If I break their apps somehow, it might take a couple of days to get them out to get it fixed.

Best I can tell right now, about every hour the correct ip settings in DNS are overwritten by the incorrect ip address.

 

[itsp1965]

A shot in the dark but can I ask if this server was running the DHCP server service at one time? I recall seeing this on a Win2K server that previously had this role and was re-used for another purpose without the re-installation of the OS. If so remove the DHCP server component

 

[SkreeM]

You also may want to check the RRAS role isn't installed as that gets DHCP address for clients and can cause a bit of a nightmare]

skr

 

[bookouri]

neither one of those things applies to this server. I did find one thing out. We have a trust with another forest and checking with the guys who run that forest there were multiple dns entries for several of our servers. We have a trust with this forest and my dns has forwarders to the other forest's dns servers, but would it be possible for the other forest's DNS servers to somehow update my dns servers wiping out my "good" records with outdated records from their dns?

 

[Zelandakh]

Quite possibly.

 

[bookouri]

What settings do i need to look at to try to protect my dns from being modified by the other forest?

 

[Trevoke]

You tell the other forest it's not allowed to replicate data on yours, just to read from yours.

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