Question : Problem: ATT DSL troubles with DNS

Hello, We have posted about this issue before but have progressed forward and done some troubleshooting to try and isolate the issue.

Basic rundown of what our history is with this one client: They originally had ATT DSL running into the office with a Windows 2003 server. The problem is that DSL would cut out many times during the day for them on all machines. We did many thngs, like clean all the machines and install NOD32 on each one, redo the bad network wiring, update and secure the server, etc.

We had ATT put in a new line, entirely new run from outside, and the problem is still occurring. SO we had the ladies in the office perform the following tests via scripts off the desktop, and they gave us the results.

TEST 1: ping the router in office
TEST 2: ping the server
TEST 3: ping ATT DNS servers

The results are in, and while TEST 3 failed once or twice, now they tell us that all three tests work fine but internet still cannot be used - no web sites off any client machines can be reached.

We are going to have them run a tracert test to further see if we can isolate this issue when the internet drops out, but does anyone have any ideas as to what the culprit can be? THis ordeal has been a 2 month hell ride and we want to get down to the bottom of it.

DNS not configured right? ATT DNS not routing properly? Please any suggestions would be nice.

Answer : Problem: ATT DSL troubles with DNS

These screenshots does not give any detail about the functioning of the DNS server. check this out
http://www.petri.co.il/install_and_configure_windows_2003_dns_server.htm

Make sure that in the NIC's propertires, the DNS server is pointed to itself.
Make sure you have forwarders setted up correctly. ( use att dns server as forwarders)