com nameserver caching
rh
rhashemian at hotmail.com
Wed Jun 18 21:22:15 UTC 2008
hi all,
if you lookup www.1and1.com, most queries come back with:
217.160.226.203.
but i started noticing that a couple of my dns servers were returning
a wrong ip: 217.160.232.1
after some digging, i noticed that the com namesavers actually have
this RR cached like so:
[~]$ dig +norec @h.GTLD-SERVERS.NET www.1and1.com
; <<>> DiG 9.2.4 <<>> +norec @h.GTLD-SERVERS.NET www.1and1.com
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29492
;; flags: qr; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
;; QUESTION SECTION:
;www.1and1.com. IN A
;; ANSWER SECTION:
www.1and1.com. 172800 IN A 217.160.232.1
;; AUTHORITY SECTION:
1and1.com. 172800 IN NS ns27.1and1.com.
1and1.com. 172800 IN NS ns28.1and1.com.
;; ADDITIONAL SECTION:
ns27.1and1.com. 172800 IN A 74.208.2.3
ns28.1and1.com. 172800 IN A 74.208.3.3
---------------------------------------------------------------
is this normal? i don't see any other RR's for major companies in
these nameservers. i assume because of this the iterative query stops
at this point and returns this bad ip without going further to the
authoritative nameservers for 1and1.com.
opinions?
thanks
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