Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!ut-emx!rick
From: rick@ut-emx.uucp (Rick Watson)
Newsgroups: comp.unix.ultrix
Subject: Re: Ultrix resolver question
Message-ID: <45129@ut-emx.uucp>
Date: 5 Mar 91 21:38:33 GMT
References: <1991Mar4.193821@Valinor.Stanford.EDU>
Organization: The University of Texas at Austin; Austin, Texas
Lines: 25

I think that netstat opens tcp/domain sockets to the nameserver.
Were you using netstat to look at your system?  You might try
"netstat -n", though I don't know if this really prevents it
from opening the connection.

Rick Watson 
The University of Texas Computation Center, 512/471-3241
   internet: rick@digate.cc.utexas.edu       bitnet: watson@utadnx
   uucp:     ...!cs.utexas.edu!ut-emx!rick   span:   utspan::utadnx::watson


In article <1991Mar4.193821@Valinor.Stanford.EDU>, vaf@Valinor.Stanford.EDU (Vince Fuller) writes:
> We recently (today) started running a DS5000/Ultrix 4.1(55) system as
> one of our primary servers for handling mail and domain service. While
> looking at the system this evening, I noticed that along with lots of
> outgoing TCP/SMTP connections, there also seem to be a lot of TCP/DOMAIN
> connections to the local domain server port. Is it the case that Ultrix
> domain requests use TCP instead of UDP by default? Alternatively, is it
> possible that sendmail 5.65 requests this? It seems like overkill to
> setup TCP/DOMAIN (instead of light-weight UDP/DOMAIN requets) for every
> simple name lookup that is done.
> 
> 	Thanks,
> 	--Vince
>