cname chaining with bind8 and 9

[Mark.Andrews at nominum.com]

	fixed in 8.2.3

> 
> I know this bug existed in BIND 4, and maybe it's still in BIND 8.  In genera
> l,
> when BIND 4/8 recieves a reply from a some other nameserver, it retransmits
> that reply on to the requesting client, replacing the request IDs.  In the ca
> se
> where BIND has managed to chase some CNAMEs through cache before forwarding,
> the request forwarded to the other nameserver is different from the request
> sent by the client.  Yet, the response is still forwarded to the client, who
> looks at it as sees the query section doesn't match the question originally
> asked.  If the client drops the request and retransmits, it will likely get a
> good reply becuase BIND has now cached the entire CNAME chain.
> 
> Christophe Deleuze wrote:
> 
> > Barry Margolin <barmar at genuity.net> writes:
> >
> > > I tried to reproduce your problem, but I ran into the following problem:
> > > the world.activia-networks.com domain, which is part of your CNAME chain,
> > > is delegated to a private address:
> >
> > Yes indeed.  This is from a testbed in a private network.  By the way, when
> > I said bind8 it's more precisely bind8.2.2p5 (I haven't investigated on
> > other 8.x versions).
> >
> > > Christophe Deleuze  <deleuze at ActiVia.net> wrote:
> > > >If I use bind 8, this is what happens:
> > > >
> > > >bash# dig @bind8-dns www.francecast.com
> > > >
> > > >; <<>> DiG 8.2 <<>> @bind8-dns www.francecast.com
> > > >; (1 server found)
> > > >;; res options: init recurs defnam dnsrch
> > > >;; wrong query name:
> > > >;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
> > > >;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
> > > >;; QUERY SECTION:
> > > >;;      cov-l.map.cannes.example.com, type = A, class = IN
> >
> > Anyway, this "wrong query name" seems a bit strange uh?
> > The wrong query name is actually the target value of the first cname.
> >
> > --
> > Dr. Christophe Deleuze          Christophe.Deleuze at ActiVia.net
> > ActiVia Networks                http://www.activia.net
> 
> --
> =====================================================================
> Josh Littlefield                                  Cisco Systems, Inc.
> joshl at cisco.com                                      250 Apollo Drive
> tel: 978-244-8378  fax: same               Chelmsford, MA  01824-3627
> 
> 
> 
> 
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com