Sam.Wilson at ed.ac.uk
Thu May 19 14:31:22 UTC 2016
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 184.108.40.206#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 220.127.116.11
> >;; Received 83 bytes from 18.104.22.168#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.
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