nslookup-non existent host/domain

Barry Margolin barmar at bbnplanet.com
Wed Mar 22 16:55:24 UTC 2000

In article < at dvs.nuphase.com>,
Maria Teresa Pineda  <mariap at digitalvideosystems.net> wrote:
>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 

Often the domain doesn't have an address of its own.  Since it's just used
for mail, it will only have NS, SOA, and MX records.  nslookup has a bug:
it says "nonexistent host/domain" even though it means "the name exists, it
just doesn't have any records of the type you requested".  That's why you
should use dig rather than nslookup -- you can tell the difference by
whether it says "status: NOERROR" or "status: NXDOMAIN" (the latter means
that the name doesn't exist at all).

>try "dig -x" (which is one of psi.com's name server) I get answer, 
>but if I try ping  I get " ICMP net unreachable".
>The same problem happen with akamaitech.net , exenet.com , shellwilcox.com 

Make sure your Internet router has "ip classless" configured on it.  If
not, you may have trouble communicating with external addresses that begin
with 38.

Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.

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