Question about this site web.da-us.citibank.com with ttl = 0

[Mark Andrews]

> Hi DNS experts,
> 
> This may not be bind related but I am seeing some strange things with
> this site:
> web.da-us.citibank.com.
> When going to http://www.citibankonline.com in the US, this is the URL
> it forwards to.
> 
> The strange thing is, everytime I try to go to the site from work,
> after a couple of minutes, the DNS servers at my work place stop
> resolving the host web.da-us.citibank.com. And if immediately I logon
> to my private isp machine offsite, and do a dig or nslookup, it won't
> resolve either.  I would get a SERVFAIL error from nslookup thereafter.
>  If I let it sits for 10 minutes or so, nslookup will start working
> fine. I never have any problem getting to the site from home.
> 
> I find from running dig/nslookup that this host has a tll of 0 . Is
> that a false result or if not, could be it causing problem like this?
> 
> I've talked to the network people briefly and they are not blocking
> access to the site. But since it's really not a work related site, I
> haven't really push them to debug their DNS server setup. But if I get
> more understanding of pausible cause, then I can talk to them.
> 
> THanks!

	They fail to respond to AAAA queries.

% dig www.citibank.com @wlbnj01.nsroot2.com +norec  aaaa

; <<>> DiG 9.3.2 <<>> www.citibank.com @wlbnj01.nsroot2.com +norec aaaa
; (1 server found)
;; global options:  printcmd
;; connection timed out; no servers could be reached
% 
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org