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AT&T DNS issues on new DS3

Posted on 2007-11-14
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Last Modified: 2008-02-01
We recently moved from bonded T1's with MCI/Verizon to a DS3 with AT&T. Now every test we do in terms of file transfers, downloads, and uploads show great speeds. However, when we go to a web site, it seems to take much longer to load. I have AT&T DNS servers as my forwarders on the internal DNS server, in the firewall, and the router. They seem to only have 4 DNS IP addresses, where MCI had a large number of them. I have been doing searches and found some information about previousl AT&T DNS issues, but nothing recent. Is there anyone who has experience with their server and can provide some feedback. We were really hoping this would greatly improve the users experience, but even those of us in the IT department notice it. New routers and firewalls were purchased for the DS3, and the configurations have been double checked by support those manufacturers.
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Question by:Rodney Barnhardt
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by:DToolshed
ID: 20282633
You might want to run a DNS test tool to check response rate and time. Compare your current DNS server responsiveness with another providers, OpenDNS.org, etc.

I use OpenDNS and some other 3rd-party forwarders. Much better response than my ISP, and thoses servers are local to me!

There is a DNS test tool here you can try, if you don't mind .NET apps:
http://www.codeproject.com/cs/internet/DNSTester.asp?df=100&forumid=300027&exp=0&select=1471791

Many people use 4.2.2.1 and 4.2.2.2 as DNS servers, and they have great response times. However, I have found that they are too slow for where I am, because of UDP packet loss. I don't know what servers you are using on ATT.

DynDNS.com is another reliable DNS provider I have used.
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by:Rodney Barnhardt
ID: 20288555
This looks like it would do what I need, but maybe I have a bigger problem. I launched the program, hit start, it returns 2-3 IP addresses, then timesout with "no response for 5 seconds". I have tried several DNS servers, including the 4.2.2.1. Any ideas?
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by:DToolshed
ID: 20290021
The 4.2.2.1 servers have changed hands apparently, and I have found them to be less reliable than they used to be. It could be that (Those servers are 4.2.2.1 thru 4.2.2.5) Try OpenDNS servers.

Doe this happen on ALL servers you try? You could have packet loss, that can mess with DNS, as the queries are small. The responses are bigger, but any drops in UDP packets can mess it up, as they are not error checked and resent.

Are you finding this on ALL machines on your network, or just one test machine right now? If it's only from one machine, you could have TCP/IP stack corruption, or bad NIC drivers. It happens. If it's from ANY machine on your network, then it would be either servers, or transport.

Try continuous pings to several different servers and see if you get any dropped packets. Or you might want to try a bigger tool. I think Spiceworks has a monitoring module that might work, but I haven't looked at it in a long time, so don't quote me on that. ;)
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Rodney Barnhardt earned 0 total points
ID: 20579736
I finally contact tech support who determined the router was triggering thermals and essentially over heating in the closet where we have our circuit located. We addressed the environmental problem and that seems to have corrected the problem with the router slowness.
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by:DToolshed
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Resolution was not found here. I'm okay with close and refund. Glad it got fixed!
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Closed, 250 points refunded.
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