[931] in resnet
DNS Issues - Random EDU lookup failures
daemon@ATHENA.MIT.EDU (Forseth, Clint G.)
Fri Mar 1 16:47:16 2002
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Message-ID: <A17AA9D6C953D640B218FCB1EB21619614E9EB@EXCHANGE.campus.stcloudstate.edu>
Date: Fri, 1 Mar 2002 15:34:07 -0600
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: "Forseth, Clint G." <cforseth@STCLOUDSTATE.EDU>
To: RESNET-L@listserv.nd.edu
We have been getting reports from several off site persons who are experiencing email delays or inabilities to get to our domain stcloudstate.edu. The problems appear to have started sometime around 2pm yesterday(that we are aware of).
Myself and another systems administrator have been banging our heads against a wall searching for the cause. Since it appears random and nothing has changed on our site (DNS settings wise) we started looking to the root servers. We noticed that the root servers J-M do not appear to resolve the NS servers for our domain or any EDU domain. The others appear to be resolving the EDU domain just fine.
In theory, it seems that the root servers J-M are not aware of the EDU domain site NS servers. We gathered that theory based on that the others A through I are resolving the name servers for our domain and for other EDU(s). There appears to be no problem with A through I resolving our ns servers and then for our servers to respond to external requests. Just with J through M.
Is anyone else experiencing anything like this or have any better theories or ideas? I'm not totally up-to-speed on how the round robin works for the root servers (which one a site checks and how often). The local cable modem users on Charter were unable to reach us last night and today and we've seen similar problems on other ISPs and with email from multiple sites being delayed. I've connected to some other known DNS servers out there doing nslookups and was unable to resolve EDU(s) on some them that I was testing on.
Any sound ideas or knowledge into this would be appreciated.
Thanks in advance,
Clint Forseth
Systems Administrator
St. Cloud State University - Go Huskies Hockey! (okay, shameless plug, but I get excited easy this time of the hockey season).
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