[Dnsmasq-discuss] server forwarding all traffic to parents after a successful PTR query of itself

Alberto Cuesta-Canada alberto.cuesta at excelian.com
Wed Feb 17 09:50:36 GMT 2010


Hi Simon,
 
2.47
 
Cheers,
 
Alberto Cuesta-Canada
GaaS Team Lead
Excelian Ltd.
+44 (0) 7942633361

________________________________

From: Simon Kelley [mailto:simon at thekelleys.org.uk]
Sent: Wed 17/02/2010 09:46
To: Alberto Cuesta-Canada
Cc: dnsmasq-discuss at lists.thekelleys.org.uk; Grid Support
Subject: Re: [Dnsmasq-discuss] server forwarding all traffic to parents after a successful PTR query of itself



Alberto Cuesta-Canada wrote:
> Hi guys,
> 
> I saw a weird scenario in one of our dnsmasq servers yesterday. As the
> logs below show, the server was all happy doing its thing, until a set
> of PTR queries came from normal servers in our network. The last of it
> would ask for the hostname of the dns server giving the IP, and from
> that point dnsmasq would route all traffic to the parents. Restarting
> the dnsmasq service would restore the server to normal operations. This
> has happened 4 times in the last 10 days, always with the same pattern.
> 
>
> Feb 17 01:35:51 dnsmasq[28538]: query[A] grdvpm3.dselgrid.local from
> 172.30.158.98
>
> Feb 17 01:35:51 dnsmasq[28538]: /etc/hosts grdvpm3.dselgrid.local is
> 172.30.158.93
>
> Feb 17 01:35:51 dnsmasq[28538]: query[PTR] 93.158.30.172.in-addr.arpa
> from 172.30.158.98
>
> Feb 17 01:35:51 dnsmasq[28538]: /etc/hosts 172.30.158.93 is
> grdvpm3.dselgrid.local
>
> Feb 17 01:35:51 dnsmasq[28538]: query[A] grdvpm3.dselgrid.local from
> 172.30.158.98
>
> Feb 17 01:35:51 dnsmasq[28538]: /etc/hosts grdvpm3.dselgrid.local is
> 172.30.158.93
>
> Feb 17 01:37:16 dnsmasq[28538]: query[MX] smtpmail.daiwaeurope.local
> from 127.0.0.1
>
> Feb 17 01:37:16 dnsmasq[28538]: forwarded smtpmail.daiwaeurope.local to
> 172.30.48.192
>
> Feb 17 01:37:16 dnsmasq[28538]: query[MX] vsmtpmail.daiwaeurope.local
> from 127.0.0.1
>
> Feb 17 01:37:16 dnsmasq[28538]: forwarded vsmtpmail.daiwaeurope.local to
> 172.30.48.192
>
> Feb 17 01:37:16 dnsmasq[28538]: query[A] smtpmail.daiwaeurope.local from
> 127.0.0.1
>
> Feb 17 01:37:16 dnsmasq[28538]: forwarded smtpmail.daiwaeurope.local to
> 172.30.48.192
>
> Feb 17 01:37:16 dnsmasq[28538]: reply smtpmail.daiwaeurope.local is <CNAME>
>
> Feb 17 01:37:16 dnsmasq[28538]: reply vsmtpmail.daiwaeurope.local is
> 172.30.19.221
>
> Feb 17 01:37:52 dnsmasq[28538]: query[PTR] 250.158.30.172.in-addr.arpa
> from 172.30.158.94
>
> Feb 17 01:37:52 dnsmasq[28538]: /etc/hosts 172.30.158.250 is
> grdxk-mgmt1.dselgrid.local
>
> Feb 17 01:37:52 dnsmasq[28538]: forwarded query to 172.30.48.192
>
> Feb 17 01:37:52 dnsmasq[28538]: forwarded query to 172.30.48.192
>
> Feb 17 01:37:52 dnsmasq[28538]: forwarded query to 172.30.48.192
>
> Feb 17 01:37:52 dnsmasq[28538]: forwarded query to 172.30.48.192
>
> Feb 17 01:37:52 dnsmasq[28538]: forwarded query to 172.30.48.192
>
> Any idea what would be going on? Is that PTR query a signal that some
> other service could be asking the DNS server to stop reading the hosts file?
> 

Which version of dnsmasq are you using?

Simon.



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