I do remember hearing in the past about a tool that can be used to "telnet" to a UDP port to see if it is alive. I can't remember what is the tool. (Maybe I was just dreaming.) Can anyone confirm or deny this. Thanks. Eric On Tue, Sep 18, 2001 at 03:46:39PM -0500, Nate Straz wrote: > On Tue, Sep 18, 2001 at 02:28:23PM -0500, Carl Wilhelm Soderstrom wrote: > > the simple way to check if there's a DNS server at least listening; is to > > telnet to port 53. > > That may work for DNS servers that are allowing zone transfers, but most > of DNS is run using UDP. How do you telnet to a UDP port? You don't. > > You could use dig and specify the server like so: > > # dig @1.2.3.4 host A > > Nate > _______________________________________________ > tclug-list mailing list > tclug-list at mn-linux.org > https://mailman.mn-linux.org/mailman/listinfo/tclug-list >