resolution problem

[Thomas Schulz]

>>>>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
> 
>>In article <mailman.812.1463666011.73610.bind-users at lists.isc.org>,
>> Matus UHLAR - fantomas <uhlar at fantomas.sk> wrote:
>>> often a problem of invalid NS delegation, or bad TTL (A record for a server
>>> expires before NS record).
> 
> On 19.05.16 15:31, Sam Wilson wrote:
>>Glue A records for the nameservers have 172800 TTL, authoritative A
>>records have 1200.
> 
> that's it!
> 
> ;; ANSWER SECTION:
> colostate.edu.          3600    IN      NS      dns3.colostate.edu.
> colostate.edu.          3600    IN      NS      dns1.colostate.edu.
> 
> ;; ADDITIONAL SECTION:
> dns3.colostate.edu.     1200    IN      A       129.82.103.111
> dns1.colostate.edu.     1200    IN      A       129.82.103.121
> 
> after 1200 seconds, the A records expire, but the NS records don't.
> 
> Next 2400 seconds you know that you have to ask dns3.colostate.edu and
> dns1.colostate.edu, but you can't find their IPs, because ...  you don't
> know their IPs.
> 
> while some DNS servers can cope with that, it's still broken setup.

Our server here running BIND 9.10.3-P4 seems to handle it OK. Do some
versions of Bind work with this broken setup while other versions do
not? I wonder what versions of Bind are running on the two servers
that do work and what versions on the two that do not.

> -- 
> Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
> Warning: I wish NOT to receive e-mail advertising to this address.
> Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
> I feel like I'm diagonally parked in a parallel universe. 

Tom Schulz
Applied Dynamics Intl.
schulz at adi.com