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Default gateway changes automatically

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bpinter

MIS
Nov 21, 2002
15
AU
Hi everyone. I've been banging my head against the wall with this one for some time now. I'am not sure if this is a Watchguard issue or a Windows issue, so I am posting it in both forums.

I have a Watchguard X500 with a LAN and a DMZ network. The Watchguard has a public IP and there is a webserver on the DMZ and a MS SBS 2K3 server on the LAN. The servers are:

SBS:
IP: 192.168.1.1/24
Gateway: 192.168.1.100 (the LAN port of the Watchguard)

Web Server:
IP: 192.168.2.1/24
Gateway: 192.168.2.100 (the DMZ port of the Watchguard)

Now the issue is that when a remote desktop connection is used to connect from the LAN to the webserver from an XP machine on the LAN the following happens: The connection is made, the logon screen is presented, but after logging in successfully, the connection drops out. Checking the server from the console then shows that the default gateway setting on the Webserver's NIC has changed to 192.168.1.100 (the LAN default gateway.) What the...? Changing this back to 192.168.2.100 then restores the connection and it can be used without any problems. The connection is not used every day but next time same problem.

It's driving me nuts! Any ideas anyone?
 
to me this sounbds like an XP bug. I would make sure that you are to date on your patches and then delete all IP info and then add it again and see what happens. does this server only have one NIC enabled?
 
Thank coladmin. The problem has been solved. It was due to the domain admin login running the SBS logon script which apparently sets the default gateway when it runs !?
 
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