resolution problem

[Sam Wilson]

In article <mailman.812.1463666011.73610.bind-users at lists.isc.org>,
 Matus UHLAR - fantomas <uhlar at fantomas.sk> wrote:

> On 18.05.16 14:10, Con Wieland wrote:
> >I am having an issue resolving www.cloudsat.cira.colostate.edu from 2 of my
> > name servers.  I have 2 others with identical configs that resolve
> > correctly.  A normal lookup shows a server fail but a +trace looks ok. 
> > Any ideas how to better troubleshoot the issue?
> 
> tried web dns checkers? Some of them use to provide useful results.
> 
> >dig www.cloudsat.cira.colostate.edu @ns1.service.uci.edu
> [...]
> >;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 1057
> 
> 
> >colostate.edu.          172800  IN      NS      dns1.colostate.edu.
> >colostate.edu.          172800  IN      NS      dns3.colostate.edu.
> >;; Received 119 bytes from 192.41.162.30#53(l.edu-servers.net) in 78 ms
> >
> >www.cloudsat.cira.colostate.edu. 3600 IN CNAME  dpc.cira.colostate.edu.
> >dpc.cira.colostate.edu. 3600    IN      A       129.82.109.62
> >;; Received 83 bytes from 129.82.103.121#53(dns1.colostate.edu) in 36 ms
> 
> often a problem of invalid NS delegation, or bad TTL (A record for a server
> expires before NS record).

Glue A records for the nameservers have 172800 TTL, authoritative A 
records have 1200.  

Sam

-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.