Question about this site web.da-us.citibank.com with ttl = 0
Mark Andrews
Mark_Andrews at isc.org
Wed Mar 29 21:55:46 UTC 2006
> >> Is AAAA record mandatory?
>
> > No. But consistantly responding to queries other than A queries
> > is. RFC 1034 / RFC 1035 describe how to respond to queries for
> > types you don't know about or don't have. RFC 1034 / RFC 1035
> > are the base DNS specifications. There is no justifiable reason
> > for any DNS server to get this wrong.
> >
> > The nameserver for web.da-us.citibank.com is not RFC 1034 / RFC 1035
> > compliant.
>
> >> How does it cause problem like I described?
>
> > This will cause the server to be marked as lame.
> >
> >dig aaaa web.da-us.citibank.com @3dns-c.citibankonline.com +norec
> <<I have omitted the rest of the reply.>>
>
>
> When I query the nameserver
>
> 3dns-c.citibankonline.com
>
> for a version, the answer is
>
> VERSION.BIND. 0S CHAOS TXT "8.3.7-REL"
>
> I cannot tell if that nameserver is authoritative for the zone
>
> citibank.com
>
> The domain in question is
>
> citibank.com
> not
> citibankonline.com.
>
> But the WHOIS record for
>
> citibank.com
>
> lists these nameservers:
>
> NS1.NSROOT1.COM 192.193.214.1
> NS2.NSROOT2.COM 199.67.172.1
>
> and those servers respond:
>
> NS1: version.bind. 0S CHAOS TXT "nusnj19-edns01.nsroot2.com"
> NS2: version.bind. 0S CHAOS TXT "9.2.4"
>
> Of course, I have no idea if those CHAOS TXT records reflect reality.
> ----------------------------------------------------------------------
> Barry S. Finkel
> Computing and Information Systems Division
> Argonne National Laboratory Phone: +1 (630) 252-7277
> 9700 South Cass Avenue Facsimile:+1 (630) 252-4601
> Building 222, Room D209 Internet: BSFinkel at anl.gov
> Argonne, IL 60439-4828 IBMMAIL: I1004994
I heard back from citibank. It is a load balancer in front of
named. The load balancer handles the A queries the rest fall
through to named which is not correctly configured.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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