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#1
January 8th, 2004, 04:57 PM
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Strange (and wrong) NXDOMAIN replies
From two hosts inside my firewall, one gets correct responses when doing dns lookups, and the other gets NXDOMAIN replies.
I'm assuming it has something to do perhaps with reverse lookups on the requesting machines, but I'm not sure there's a) anything wrong there, b) that that is indeed where the problem might lie. Same name servers, same requests (hostnames masked to protect the...): Good Request: [root@itsgood etc]$ dig mail.****.com ; <<>> DiG 9.2.1 <<>> mail.****.com ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50540 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;mail.****.com. IN A ;; ANSWER SECTION: mail.****.com. 4630 IN A ***.***.***.*** ;; Query time: 3 msec ;; SERVER: 10.10.10.35#53(10.10.10.35) ;; WHEN: Thu Jan 8 16:17:32 2004 ;; MSG SIZE rcvd: 55 Bad Request: [root@notgood root]# dig mail.****.com ; <<>> DiG 9.2.1 <<>> mail.****.com ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 57753 ;; flags: qr aa; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;mail.****.com. IN A ;; AUTHORITY SECTION: com. 172800 IN SOA a.gtld-servers.net. nstld.verisign-grs.com. 2004010800 1800 900 604800 86400 ;; Query time: 205 msec ;; SERVER: 10.50.20.10#53(10.50.20.10) ;; WHEN: Thu Jan 8 14:55:18 2004 ;; MSG SIZE rcvd: 111
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#2
January 8th, 2004, 08:40 PM
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They are not the same name servers. One is "10.10.10.35" and the other is "10.50.20.10". The first is a caching server the other is an authoritative server (at least it seems to be).
__________________
Send me a private message if you would like me to setup your DNS for you for a price of your choosing. This is the preferred method if your DNS needs to be fixed/setup fast and you don't have the time to bounce messages back and forth on a forum. Also, check out these links: Whois Direct | DNS Crawler | NS Trace | Compare Free DNS Hosts Last edited by SilentRage : January 8th, 2004 at 08:42 PM.
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#3
January 9th, 2004, 10:38 AM
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It did the same thing when I specified the same server with hte dig command.
And I figured out, I'm an idiot... there was an extra character in the domain name from the failing lookup. But because each time I did it, I used the command history to reselect the proper dig command, I kept getting the same results. Sometimes you stare at something too long, and you miss the obvious prob. Now I can get back to the real problem, which is sendmail not being able to deliver messages to the mail.****.com server. (which after all this hunting down a dead end, seems to be simply they're offline more often than not) Thanks again though!
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