[BLU] ssh delays

[chy at genuity.com (Chuck Young)]

Try 'dig' (domain information groper)

dig -x <IP> to verify reverse lookups.  However, this will only query your
resolvers (/etc/resolv.conf servers).  Find out the authoritatitive NS for
your in-addr.arpa domain and query it:

dig -x <IP> @<authserver>

try dig -soa 0.Z.Y.X.in-addr.arpa to find the server responsible for your
block and put its IP in <authserver> above (no spaces after @sign).

HTH

----------------------
Chuck Young
Internet Systems Engineer
E-Services Consulting
Genuity Solutions
-----------------------------

> -----Original Message-----
> From: owner-discuss at Blu.Org [mailto:owner-discuss at Blu.Org]On Behalf Of
> Chris Janicki
> Sent: Friday, September 21, 2001 12:23 PM
> To: John Chambers
> Cc: discuss at Blu.Org
> Subject: Re: [BLU] ssh delays
>
>
>
> > Hmmm ...  I did some checking with nslookup on both ends of  a  link,
> > and  in  all  cases,  it  found  a name for the IP addresses within a
> > second. I also tried all the known host names with nslookup, and they
> > all got an address within a second.  This would seem to say that DNS,
> > forward and reverse, is working fine.
>
> 2-cents... I've read that nslookup does not use the same networking
> libraries/kernel routines/whatever that are used by applications (such as
> SSH).  So there is a possibility that nslookup may work, but yous
> application can still fail to reverse lookup.
>
> I've seen this happen before, where nslookup works, but my Java app
> stalls for 5-min, then continues merrily along.  It's a long shot, but if
> all else fails, try to write a small app to double-check the reverse
> lookup.  (I could write a small Java version of nslookup If you'd like.)
> -
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