[dns-operations] Inconsistent NS records for ARPA zones at OpenDNS

[Sebastian Castro]

On 23/01/12 15:21, Frank Bulk wrote:
> I tried Ulevitch yesterday at his private email address, but didn't get a
> response, so I'm reaching out here.  Both yesterday and today our automated
> DNS checks (which check NS records for domains we host, both the forward and
> reverse ones) show inconsistent results at resolver1.opendns.com and
> resolver2.opendns.com.
> 
> Inconsistent in the sense that it doesn't match up with that we've
> configured, as well as resolver1 and resolver2 don't match up for some of
> the ARPA zones.  Here's some examples; the output from Google is correct.

Hi Frank,

It seems the inconsistency can be explained by comparing what's on the
parent against what you are publishing.

ARIN nameservers indicate the nameservers for 10.31.96.in-addr.arpa are

10.31.96.in-addr.arpa.	86400	IN	NS	NS1.NETINS.NET.
10.31.96.in-addr.arpa.	86400	IN	NS	NS1.MTCNET.NET.


While the auth nameservers themselves report

10.31.96.in-addr.arpa.	86400	IN	NS	ns1.netins.net.
10.31.96.in-addr.arpa.	86400	IN	NS	ns1.mtcnet.net.
10.31.96.in-addr.arpa.	86400	IN	NS	ns2.mtcnet.net.

Perhaps resolver2.opendns.com is not updating the cache based on the
authoritative answer? Would be fixed if you try to add ns2.mtcnet.net to
ARIN?

Cheers,

> 
> nagios:/home/fbulk# dig NS 10.31.96.in-addr.arpa @resolver1.opendns.com
> +short
> NS1.MTCNET.NET.
> NS1.NETINS.NET.
> nagios:/home/fbulk# dig NS 10.31.96.in-addr.arpa @resolver2.opendns.com
> +short
> NS1.MTCNET.NET.
> NS1.NETINS.NET.
> nagios:/home/fbulk# dig NS 10.31.96.in-addr.arpa @8.8.8.8 +short
> ns1.netins.net.
> ns2.mtcnet.net.
> ns1.mtcnet.net.
> 
> 
> nagios:/home/fbulk# dig NS 7.31.96.in-addr.arpa @resolver1.opendns.com
> +short
> ns2.mtcnet.net.
> ns1.mtcnet.net.
> ns1.netins.net.
> nagios:/home/fbulk# dig NS 7.31.96.in-addr.arpa @resolver2.opendns.com
> +short
> NS1.NETINS.NET.
> NS1.MTCNET.NET.
> nagios:/home/fbulk# dig NS 7.31.96.in-addr.arpa @8.8.8.8 +short
> ns1.mtcnet.net.
> ns2.mtcnet.net.
> ns1.netins.net.
> nagios:/home/fbulk#
> 
> 
> 
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-- 
Sebastian Castro
DNS Specialist
.nz Registry Services (New Zealand Domain Name Registry Limited)
desk: +64 4 495 2337
mobile: +64 21 400535