Bind sometimes SERVFAIL

[Luis Daniel Lucio Quiroz]

Le mercredi 11 novembre 2009 09:15:12, Matus UHLAR - fantomas a écrit :
> On 11.11.09 16:05, Pawel Rutkowski wrote:
> > Please look below, it's normal ? Sometime servfail, sometimes nxdomain.
> >
> > [root at linux ~]# host 209.85.255.187 ns1.isp
> > Using domain server:
> > Name: ns1.isp
> > Address: ns1.isp#53
> > Aliases:
> >
> > Host 187.255.85.209.in-addr.arpa not found: 2(SERVFAIL)
> > [root at linux ~]# host 209.85.255.187 ns1.isp
> > Using domain server:
> > Name: ns1.isp
> > Address: ns1.isp#53
> > Aliases:
> >
> > Host 187.255.85.209.in-addr.arpa not found: 3(NXDOMAIN)
> > [root at linux ~]# host 209.85.255.187 ns1.isp
> > Using domain server:
> > Name: ns1.isp
> > Address: ns1.isp#53
> > Aliases:
> >
> > Host 187.255.85.209.in-addr.arpa not found: 3(NXDOMAIN)
> 
> Use 'dig -x 209.85.255.187 @ns1.isp' and look at "NS" records and TTLs.
> Invalid delegations and inconsistent NS records (domain is delegated from
> parent to different servers than those listed in the domain) often cause
> these kinds of problems.
> 
I think I did have same problem
with 9.4.1p1, 9.5p2 and 9.6p1. Look

[dieu at brandmauer ~]$ host www.bbc.co.uk 127.0.0.1
Using domain server:
Name: 127.0.0.1
Address: 127.0.0.1#53
Aliases:

www.bbc.co.uk is an alias for www.bbc.net.uk.
www.bbc.net.uk has address 212.58.253.68
Host www.bbc.net.uk not found: 2(SERVFAIL)
[dieu at brandmauer ~]$


I did sniff connecction and It seems that the query that fails is a MX request 
of www.bbc.net.mx. Odd thing.

When I ask to a exchange dns server, query is okay.

Is this a bug?