External DNS resolution

[WaferITMan]

We recently updated to windows 2003 active directory and I believe our DNS is not configured correctly. Internal DNS resolves perfect. We upgraded from a WINS configuration to DNS. The problem we have is resolving against outside IP addresses. We currently have 3 DNS servers, 2 internal and 1 in the DMZ. The internal DNS have a forwarder set to point to the DMZ DNS. The DMZ DNS is forwarding to our external DNS. Do you have any ideas to where this problem can be? Any input would be greatly appreciated.

Thanks.

 

[Serbtastic]

Try running an nslookup against the DNS server in the DMZ and see if it resolves the name correctly.

 

[WaferITMan]

Thank you for the response. I they can both communicate with each other. When I run a nslookup on the DMZ server it give ms a DNS request timed out.

Any other suggestions?

Thanks.

G

 

[ChrisAC]

If your DMZ DNS server had a forwarder to an external DNS server but it still can't resolve DNS then there is either a problem with the server that you are forwarding to or a communication issue between the two.

Sick a laptop or PC in the DMZ and query the external DNS server to see if it accepts DNS requests and resolves them.

Chris.


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Chris A.C, CCNA, CCSA
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[ChrisAC]

Sick? I meant stick ;-)

Chris.

**********************
Chris A.C, CCNA, CCSA
**********************

 

[WaferITMan]

Thanks for the help. Issue resolved. The DNS server was improperly configured. The forwarding rule was in place but no zone was configured.

G