[dns-operations] problem reverse dns resolve 212.186.228.42

[Jeroen Massar]

On 2012-01-13 12:12 , Michael Monnerie wrote:
> Helo,
> 
> we have 2 DNS servers in 2 different datacenters, running since years 
> without problem. So I think it's not a problem from us, that both our 
> DNS cannot resolve a simple
> # dig -x 212.186.228.42
> 
> We just get a timeout, but when I try from different internet accesses, 
> I get a resolve:
> 42.228.186.212.in-addr.arpa. 86400 IN   PTR     vcoe-exchange.vcoe.at.
> 
> Can someone show me where to search for the problem?

Use +trace, and you will find it quickly enough that:

dig +trace -x 212.186.228.42
[...]

228.186.212.in-addr.arpa. 86400	IN	NS	chans01.chello.fr.
228.186.212.in-addr.arpa. 86400	IN	NS	chans00.chello.fr.
;; Received 98 bytes from 193.0.0.193#53(193.0.0.193) in 417 ms

;; connection timed out; no servers could be reached

There is your answer as those don't answer

Greets,
 Jeroen