vaf@Valinor.Stanford.EDU (Vince Fuller) (03/05/91)
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
rick@ut-emx.uucp (Rick Watson) (03/06/91)
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 >