Question

Intermittent lose of connection to a remote domain controller - remote domain controller Gateway IP address changes to Main Office gateway Address

Asked by: intellica

1. Have a main office setup with an SBS 2003 AD integrated domain controller. Main office network is 192.168.0.0, with a gateway address of 192.168.0.1
2. Have a remote office setup with a second domain controller that is a member server of the SBS 2003 domain. Remote office network is 192.168.1.0, with a gateway address of 192.168.1.1
3. Main office and remote site are connected via a point to point vpn using Sonicwall devices (TZ 180).
4. Intermittently, the remote server will not respond (ping), while other devices on the remote network do. The VPN tunnel is still active in this scenario since I can still ping other devices on the remote network. When I can't ping the remote server, I'm finding that the gateway address for the remote server gets changed from 192.168.1.1 (remote gateway), to 192.168.0.1 (main office gateway). If I manually change gw address back to 192.168.1.1, can now ping the remote server. However, after some period of time, will lose connection to the remote server, and once again find the gw address has changed!
This one has me baffled - any help greatly appreciated.

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Asked On
2008-01-17 at 12:38:17ID23091493
Tags

domain

,

controller

,

connection

,

lose

Topics

Miscellaneous Networking

,

SBS Small Business Server

Participating Experts
2
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Comments
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Answers

 

by: LilshooterPosted on 2008-01-17 at 18:40:31ID: 20687489

How about using the persistent setting to see if the gateway remains there?

route add 192.168.1.0 mask 255.255.255.0 192.168.1.1 -p


Cheers,

Shooter

 

by: intellicaPosted on 2008-01-18 at 07:23:25ID: 20690939

Thanks for the prompt reply.
I thought about that, but the thing is is that the change occurs while the system is running, not after a restart.
I just noticed what might be an association between the gateway address getting changed and AD replication. The connection to the remote server was working fine all yesterday evening and night. This morning, I added a user on the Main office server. Just a few minutes after that, couldn't ping the remote office server. When I checked it, sure enough the GW address had changed from 192.168.1.1 to 192.168.0.1. Any idea why AD replication would cause this to happen?

 

by: intellicaPosted on 2008-01-18 at 14:03:24ID: 20694626

More information. I've found that the gateway address changes whenever I log onto the remote server as a domain administrator.

 

by: intellicaPosted on 2008-01-18 at 14:24:29ID: 20694759

Following up on the fact that logging results in the change to the gateway address - it appears to be directly related to the running of the SBS_LOGIN_SCRIPT.bat file. I was able to run ping right up to the point when the script started, but as soon as the script completed, no more ping to the remote server, and the remote server gateway address had changed. Any idea what this script is doing, and why it would affect the gateway address?

 

by: intellicaPosted on 2008-01-20 at 08:32:34ID: 20701621

Finally figured out what is going on.
The default gateway address of the remote server would change whenever I logged onto the remote server. Found that the profile all domain users was running a login script called SBS_LOGIN_SCRIPT.bat. As soon as I removed the reference to the login sscript from a test admin user, no longer had the problem. The login script is running a program called setup.exe. In the folder containing this setup program is a file called config.dat. Appears to be an xml script, but anyway it contains a tag for "defaultgateway 192.168.0.1" (gateway address for the main office).
I'd love to know why this is needed, but couldn't find any information.

Hopefully this will help someone else who runs into the same thing.

Since I figured this out, do I get to assign the points to myself? :)

 

by: Vee_ModPosted on 2008-01-29 at 04:13:17ID: 20767034

Closed, 500 points refunded.
Vee_Mod
Community Support Moderator

20120131-EE-VQP-002

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