nslookup-non existent host/domain

Chris Cell ccell at home.com
Wed Mar 22 14:43:05 UTC 2000


Make sure you are doing good reverse lookup. If you are leasing ip address
space form your isp make sure they are pointing your subnetted space to your
nameserver for the in-addr.arpa. This could be because of securities put in
place by some domains that will try a reverse lookup before responding or
sending/receiving email, etc.

Chris
----- Original Message -----
From: Maria Teresa Pineda <mariap at digitalvideosystems.net>
To: <bind-users at isc.org>
Sent: Wednesday, March 22, 2000 9:00 AM
Subject: nslookup-non existent host/domain


> Hi, I hope somebody can help me. I can not get answer for some external
> domains and for anothers ones I do. For example if I try with psi.com I
get
> "non existent host/domain" , if I change for another server (like
> a.root-servers.net) I get answer. If I try, with my server, the external
> domain ibm.net (for example) I get answer. Also I realize that if I ask
for
> psi.com using nslookup with q=any I get answer, the same happen with
> q=ns  but with q=a I do not get answer ("non existent host/domain"). If I
> try "dig -x 38.8.5.2" (which is one of psi.com's name server) I get
answer,
> but if I try ping 38.8.5.2  I get " ICMP net unreachable".
> The same problem happen with akamaitech.net , exenet.com , shellwilcox.com
> domains.
> Of course I can not access the "www.psi.com" and "www.exenet.com" web
> pages. And I can not send e-mail neither receive e-mail from their users.
> Any help will be appreciate......
>
> PD: my resolv.conf is ok, I checked with " nslookup set all"
> My root.hints files are update.
>
> The following is the exit to the command "dig -d2 psi.com":
>
> ;; res_mkquery(0, 220.161.253.38.in-addr.arpa, 1, 12)
> ------------
> SendRequest(), len 45
> HEADER:
> opcode = QUERY, id = 3751, rcode = NOERROR
> header flags: query, want recursion
> questions = 1, answers = 0, authority records = 0, additional = 0
> QUESTIONS:
> 220.161.253.38.in-addr.arpa, type = PTR, class = IN
> ------------
> ------------
> Got answer (214 bytes):
> HEADER:
> opcode = QUERY, id = 3751, rcode = NOERROR
> header flags: response, auth. answer, want recursion, recursion avail.
> questions = 1, answers = 1, authority records = 3, additional = 3
> QUESTIONS:
> 220.161.253.38.in-addr.arpa, type = PTR, class = IN
> ANSWERS:
> -> 220.161.253.38.in-addr.arpa
> type = PTR, class = IN, dlen = 17
> name = dvs.nuphase.com
> ttl = 86400 (1D)
> AUTHORITY RECORDS:
> -> 161.253.38.in-addr.arpa
> type = NS, class = IN, dlen = 8
> nameserver = gator.nuphase.com
> ttl = 86400 (1D)
> -> 161.253.38.in-addr.arpa
> type = NS, class = IN, dlen = 18
> nameserver = sec1.dns.psi.net
> ttl = 86400 (1D)
> -> 161.253.38.in-addr.arpa
> type = NS, class = IN, dlen = 7
> nameserver = sec2.dns.psi.net
> ttl = 86400 (1D)
> ADDITIONAL RECORDS:
> -> gator.nuphase.com
> type = A, class = IN, dlen = 4
> internet address = 38.253.161.130
> ttl = 86400 (1D)
> -> sec1.dns.psi.net
> type = A, class = IN, dlen = 4
> internet address = 38.8.92.2
> ttl = 94335 (1d2h12m15s)
> -> sec2.dns.psi.net
> type = A, class = IN, dlen = 4
> internet address = 38.8.93.2
> ttl = 94335 (1d2h12m15s)
> ------------
> Server: dvs.nuphase.com
> Address: 38.253.161.220
> ;; res_mkquery(0, psi.com, 1, 1)
> ------------
> SendRequest(), len 25
> HEADER:
> opcode = QUERY, id = 3752, rcode = NOERROR
> header flags: query, want recursion
> questions = 1, answers = 0, authority records = 0, additional = 0
> QUESTIONS:
> psi.com, type = A, class = IN
> ------------
> timeout
> timeout
> timeout
> timeout
> SendRequest failed
>
>
>
>
> Digital Video Systems - Miami
> a division of NuPhase Electronics, Inc.
> 3700 Northwest 114th Avenue
> Miami, Florida 33178-1843
> Tel: 786-331-2530
> Fax: 305-436-8802
> e-mail:mariap at digitalvideosystems.net
>
>
>
>
>




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