DNS Server - ISP problems 4

[faadil]

Hi all. I have a small problem but a nagging one. I have both an Active Directory and DNS Server service running on one and same computer. Now when I get connected to my ISP using a second NIC, several problems start to crop up. First, I get loads of errors with event id 1000 and return
value 1722. I also get NTDS General error with event id 1126 which says unable to establish connection with global catalog. A simple nslookup command shows that it's the ISP's dns server that is being queried. How can I change that? I'm hoping it would solve the other errors also. When I'm not connected to the ISP, all runs well and no errors whatsoever are logged. Any ideas? Thanks. Faadil

 

[lhuegele]

Let me see if I understand, you have a server that is a DC and a DNS server. This server has 2 nics. One is on your internal network and the other is connected directly to your ISP's modem? Do you have a router in the mix or no?

 

[faadil]

Yes you're correct except that I don't have a router. I have a proxy service running on that same computer which provides net access to other pcs on the network. Everyone's able to connect to the net without any problems. The only bother seems to be with the errors which show up in event viewer. I forgot to mention that the both monitoring test in the DNS mmc pass when there is no net connection but fail when it's connected to the net...

 

[lhuegele]

Do you have a fixed IP address from your ISP? One way to get around this would be to set-up fixed IP information on your connection to your ISP if possible. What's happening is that the 2 nic's on that server have competing DNS settings, and it looks like DNS queries are being passed to your ISP instead of staying local.

If you had a fixed IP address, you chould manually set-up the IP information on the other nic to have the correct internal DNS setting.

Good luck

 

[faadil]

Thanks lhuegele. I did not have a fixed IP for the NIC connecting to the ISP. However, I scrapped the whole DNS and reconstructed it from scratch. All is working well now. Must've been some incorrect entries in there somewhere that cropped up. Thanks again.

 

[markdmac]

Make certain you have your system configured properly to ensure problems do no creep back.

DNS Settings

Set all static NIC TCP/IP properties to only list internal DNS servers.

In DHCP set the DNS setting to internal DNS servers.

In DNS, configure ISP DNS on the forwarders tab.

I hope you find this post helpful.

Regards,

Mark

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