 |  |
yeah, well "ns2" is out of commission because of the WTC
Re: weird dns error resolving "www"
From: andrew kagan
Date: Saturday, September 22, 2001
Time: 3:47:22 pm
bombing...ns.idt.net is only a secondary...does DNS Expert's info indicat=
e
it doesn't hold the zone data, or it's just "nonauthoritative"?
Also, if the primary NS _is_ responding, why would it make the resolution
any slower if one of the NS's in non-operational?
Lastly, why is it more desirable to have 2 A records pointing to an IP
instead of an A record and a CNAME?
Thanks for the feedback.
----- Original Message -----
From: "Len Conrad" <LenConrad@MenAndMice.com>
To: "QuickDNS Talk" <quickdns-talk@lists.menandmice.com>
Sent: Saturday, September 22, 2001 3:17 PM
Subject: Re: weird dns error resolving "www"
>
> >Hi All: I have a domain I've been hosting for over a
year...."gas2001.com"
> >
> >I have an A record for the domain pointing to the webserver.
> >
> >I have a CNAME record for "www" pointing to the root A record
>
> replace the CNAME with a A.
>
> >suddenly browsers trying to connect to www.gas2001.com can't resolve t=
his
> >address.
>
> ; <<>> DiG 8.3 <<>> www.gas2001.com a
> ;; res options: init recurs defnam dnsrch
> ;; got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 3, ADDITIONAL: 3
> ;; QUERY SECTION:
> ;; www.gas2001.com, type =3D A, class =3D IN
>
> ;; ANSWER SECTION:
> www.gas2001.com. 1D IN CNAME gas2001.com.
> gas2001.com. 1D IN A 206.20.122.72
>
> ;; AUTHORITY SECTION:
> gas2001.com. 1D IN NS ns.idt.net.
> gas2001.com. 1D IN NS ns1.ardentmicro.com.
> gas2001.com. 1D IN NS ns2.ardentmicro.com.
>
> ;; ADDITIONAL SECTION:
> ns.idt.net. 1d22h32m4s IN A 198.4.75.100
> ns1.ardentmicro.com. 1D IN A 206.20.122.11
> ns2.ardentmicro.com. 1D IN A 206.20.122.12
>
> ;; Total query time: 3974 msec
>
> It took nearly 4 secs to resolve, queried from NJ, maybe there=B4s a
> connectivity pb that is causing long delays that cause resolvers to
timeout.
>
> traceroute is fast enough to the www:
>
> Lists# traceroute 206.20.122.72
> traceroute to 206.20.122.72 (206.20.122.72), 30 hops max, 40 byte packe=
ts
> 1 host-66-40-138-41.flashhost.com (66.40.138.41) 0.221 ms 0.198
> ms 0.332 ms
> 2 VLAN7.FMT6509-2.hostcentric.com (209.25.128.71) 0.795 ms 0.741
> ms 0.677 ms
> 3 GigE4-2.FMT-2.hostcentric.com (66.40.24.101) 0.370 ms 0.293 ms
0.327 ms
> 4 GigE6-0.FMT-2.hostcentric.com (66.40.24.110) 0.829 ms 1.037 ms
0.781 ms
> 5 vlan5.paix-1.hostcentric.com (216.65.0.5) 0.915 ms 0.811 ms 0.8=
23
ms
> 6 64.124.50.162.maxim.com (64.124.50.162) 1.122 ms 0.827 ms 0.857=
ms
> 7 sjc2-pao1-oc48-2.sjc2.above.net (208.185.175.161) 1.273 ms 1.339
> ms 1.319 ms
> 8 core1-core4-oc48.sjc2.above.net (208.184.102.201) 1.422 ms 1.284
> ms 1.610 ms
> 9 core6-sjc2-oc48.sjc1.above.net (216.200.0.177) 1.484 ms 1.397
> ms 1.449 ms
> 10 core2-sjc1-oc3.sjc6.above.net (207.126.96.106) 1.849 ms 1.735
> ms 1.966 ms
> 11 idt-above-10Mbps.maew.above.net (209.133.31.210) 2.980 ms 2.783
> ms 2.708 ms
> 12 54-core-1-oc3-2-0.hck.idt.net (169.132.147.50) 71.787 ms 72.131
> ms 72.584 ms
> 13 colo-1-fe-0-0.hck.idt.net (169.132.190.150) 72.037 ms 72.464
> ms 72.074 ms
> 14 www.buvalue.com (206.20.122.72) 71.673 ms 71.580 ms 72.292 ms
>
> but one of the DNS's isn=B4t responding:
>
> traceroute to 206.20.122.12 (206.20.122.12), 30 hops max, 40 byte packe=
ts
> 1 host-66-40-138-41.flashhost.com (66.40.138.41) 0.222 ms 0.326
> ms 0.155 ms
> 2 VLAN7.FMT6509-2.hostcentric.com (209.25.128.71) 0.922 ms 0.865
> ms 0.567 ms
> 3 GigE4-2.FMT-2.hostcentric.com (66.40.24.101) 0.459 ms 0.430 ms
0.384 ms
> 4 GigE6-0.FMT-2.hostcentric.com (66.40.24.110) 0.959 ms 0.836 ms
0.781 ms
> 5 vlan5.paix-1.hostcentric.com (216.65.0.5) 0.918 ms 0.968 ms 0.8=
90
ms
> 6 64.124.50.162.maxim.com (64.124.50.162) 0.885 ms 0.855 ms 1.045=
ms
> 7 sjc2-pao1-oc48-2.sjc2.above.net (208.185.175.161) 1.358 ms 1.418
> ms 1.316 ms
> 8 core3-core4-oc48.sjc2.above.net (208.184.102.197) 1.864 ms 1.504
> ms 1.415 ms
> 9 core6-sjc2-oc48-2.sjc1.above.net (208.184.102.205) 1.511 ms 1.40=
5
> ms 1.443 ms
> 10 core2-sjc1-oc3.sjc6.above.net (207.126.96.106) 1.898 ms 1.802
> ms 2.090 ms
> 11 idt-above-10Mbps.maew.above.net (209.133.31.210) 2.739 ms 3.294
> ms 3.028 ms
> 12 54-core-1-oc3-2-0.hck.idt.net (169.132.147.50) 72.472 ms 71.831
> ms 72.123 ms
> 13 colo-1-fe-0-0.hck.idt.net (169.132.190.150) 72.561 ms 71.993
> ms 72.144 ms
> 14 * * *
> 15 * * *
> 16 * * *
> 17 * * *
>
> >Is there something wrong with my DNS config?
>
> it sure looks like it:
>
> Errors
> ----------------------------------------------------------------------
> o The server "ns2.ardentmicro.com." did not reply
> The server "ns2.ardentmicro.com." did not reply when it was
> queried for the name "gas2001.com.". This indicates that the
> server is not running, or it is currently unreachable.
>
> o Non-authoritative data received from the server "ns.idt.net."
> The server "ns.idt.net." is listed as being authoritative for the
> domain, but it does not contain authoritative data for it.
>
> o Only one of your name servers has autoritative data for the zone.
> The server "ns1.ardentmicro.com." is the only server that has
> authoritaive data for the zone. If this server becomes
> unavailable, your domain will become inacessible.
>
> Len
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