Error logs in bind resolving

[Chris Buxton]

On Dec 30, 2013, at 2:29 AM, Gaurav Kansal <gaurav.kansal at nic.in> wrote:

> Dear All,
>  
> In my bind server logs, I am getting too much error logs of below mentioned type.
> Can anyone pl. explain me why I am getting these logs and how to get rid of those.
>  
> Although when I am doing dig for the domain (for which I am getting the error), I am getting the valid output.
>  
> Thanks.
>  
> Dec 30 15:54:18 IPV6-NKN-DNS named[13123]: error (FORMERR) resolving 'ib.sin1.geoadnxs.com/AAAA/IN': 64.208.141.10#53

I see an incorrect negative response. Could this be the problem? Here is the end of a dig trace:

geoadnxs.com.		172800	IN	NS	01.auth.nym1.appnexus.net.
geoadnxs.com.		172800	IN	NS	01.auth.nym2.appnexus.net.
geoadnxs.com.		172800	IN	NS	01.auth.lax1.appnexus.net.
geoadnxs.com.		172800	IN	NS	01.auth.ams1.appnexus.net.
;; Received 222 bytes from 192.33.14.30#53(192.33.14.30) in 123 ms

sin1.geoadnxs.com.	86400	IN	NS	ns2.apac.gslb-ns.net.
sin1.geoadnxs.com.	86400	IN	NS	ns1.apac.gslb-ns.net.
;; Received 122 bytes from 68.67.133.169#53(68.67.133.169) in 67 ms

geoadnxs.com.		30	IN	SOA	ns1.gslb.com. support.appnexus.net. 1 86400 30 86400 30
;; Received 103 bytes from 64.208.141.10#53(64.208.141.10) in 187 ms
_______________________________

My resolving name server complains as follows:

Dec 30 10:19:45 ubuntu named[1299]: DNS format error from 64.208.141.10#53 resolving ib.sin1.geoadnxs.com/AAAA for client ::1#60014: invalid response
Dec 30 10:19:45 ubuntu named[1299]: error (FORMERR) resolving 'ib.sin1.geoadnxs.com/AAAA/IN': 64.208.141.10#53
Dec 30 10:19:45 ubuntu named[1299]: DNS format error from 64.208.141.11#53 resolving ib.sin1.geoadnxs.com/AAAA for client ::1#60014: invalid response
Dec 30 10:19:45 ubuntu named[1299]: error (FORMERR) resolving 'ib.sin1.geoadnxs.com/AAAA/IN': 64.208.141.11#53
_______________________________

I believe the problem is that when asked for an AAAA record, the load balancer gives an otherwise-proper-looking negative response that claims to be from the wrong zone.

Regards,
Chris Buxton