Resolving problems

[Mark_Andrews at isc.org]

> 
> We observe similar problems trying to resolve mx-records for
> mma-architects.co.uk (involving same authoritative name servers as
> were mentioned in this thread already).
> Strangely enough (for me) bind version 8.2.3 deals ok with that
> map?.dns.gxn.net servers.
> 
> Simon Waters <Simon at wretched.demon.co.uk> wrote in message news:<a6sq8m$dcu@
> pub3.rc.vix.com>...
> > Re: Problems e-mailing anchorvans.co.uk
> > 
> > Nate Campi wrote:
> >  
> > > It doesn't look like corrupted cache, but BIND tossing the oversized
> > > response entirely:
> > 
> > I was guessing as he said it worked first time, then failed.
> >  
> > >  $ dig  @map1.dns.gxn.net anchorvans.co.uk any
> > > 
> > >  ; <<>> DiG 8.3 <<>> @map1.dns.gxn.net anchorvans.co.uk any
> > 
> > The problem I saw with "dig" showing a packet dump is fixed in
> > 9.2.1rc1.
> > 
> > Now it spits an error saying the truncated packet looks suspect,
> > and succeeds in retrieving the packet using TCP. This is
> > consistent with the changelog for BIND 9.2.1rc1.
> > 
> > Didn't Dan comment on the format of the truncation not being
> > well defined in the standards.
> > 
> > > It would appear that an MTA doing ANY queries to get the MX info for
> > > anchorvans.co.uk would be out of luck. Since this is standard for MTAs,
> > > I'd say anchorvans.co.uk is missing out on a lot of mail.
> > 
> > Hmm, well it can't be helping the reliability of their e-mail,
> > especially given the number of people who mistakenly block TCP
> > on port 53.
> 
> --
> Andrey Alekseyev.  Zenon N.S.P., Moscow, Russian Federation
> Senior Unix systems administrator
> 

	It really would help if the server didn't *lie* when it gets
	a EDNS style query.  The answer below says that there are
	no MX records for mma-architects.co.uk.

	Mark

; <<>> DiG 9.2.1rc2 <<>> mx mma-architects.co.uk @map4.dns.gxn.net +bufsize=2049
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 666
;; flags: qr aa rd; QUERY: 0, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; Query time: 366 msec
;; SERVER: 195.224.255.34#53(map4.dns.gxn.net)
;; WHEN: Thu Apr  4 16:06:35 2002
;; MSG SIZE  rcvd: 12

--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org