Strange resolver behavior

[Edwin Groothuis]

On Tue, Feb 12, 2008 at 06:42:37PM -0800, Xin LI wrote:
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> Edwin Groothuis wrote:
> > On Tue, Feb 12, 2008 at 05:31:57PM -0800, Xin LI wrote:
> >> Received 127 bytes from 127.0.0.1#53 in 0 ms
> >> [delphij at charlie] ~> host ps_other.a.shifen.com
> >> ps_other.a.shifen.com has address 202.108.22.46
> >> Host ps_other.a.shifen.com not found: 3(NXDOMAIN)
> > 
> > 12:49:45.620015 IP 10.251.1.18.51852 > 202.108.22.102.53:  18450 MX? ps_other.a.shifen.com. (39)
> > 12:49:46.086227 IP 202.108.22.102.53 > 10.251.1.18.51852:  18450 NotImp*- 0/0/0 (39)
> > 
> > That's the one it is complaining about, not about the hostname
> > itself.
> > 
> > Yes, the warning/error message could be a little bit smarter.
> 
> Em...  That's fine I think, it does not seem to be the MX to cause the
> problem, though.  I have tried to visit 'dict.baidu.com' in Firefox and
> it told me that the name can not resolve.  tcpdump indicates that the
> server has respond the A RR but resolver still queries AAAA...

Yes, but it is the MX record querying it is complaining about.

Edwin

-- 
Edwin Groothuis      |            Personal website: http://www.mavetju.org
edwin at mavetju.org    |              Weblog: http://www.mavetju.org/weblog/