Re: IDS: X-Term ports

Robert Graham (robert_david_grahamyahoo.com)
Fri, 24 Sep 1999 13:06:02 -0700 (PDT)

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--- Tim Knox <TimKnoxDynaMark.com> wrote:
> Hey All,
> 
> 	Does anyone know what ports X-Term uses? Does it differ from
> implementation to implementation or is it a standard? Does anyone have any
> experience having to open ports on a firewall to allow X-Term traffic
> between two VPNs?
1. 6000 (plus more, see below)
2. Tt goes in the reverse direction than you think. If I telnet to a HOST, I
connect to port 23 on the HOST. If I start an xterm session on the HOST, the
xterm program itself connects to port 6000 on my CLIENT.
3. Because of (2) above, you generally need to open no ports on your firewall.
Firewalls typically block incoming connections, but allow outgoing ones. The
xterm connection is outgoing.
4. Related to (2) above, how do you plan on launching 'xterm' on the HOST? With
telnet, there is already a 'telnetd' running in the background waiting to
accept connections. With 'xterm', nothing is running. You must first get to the
host (often with telnet :-) and launch 'xterm'.
5. In short, you almost certainly to not want to use 'xterm'. You probably want
to run an 'xterm' on your local UNIX machine, then within the 'xterm' run
telnet/rlogin/ssh.
Rob.
=====
Robert Graham
"Anxiously awaiting the millenium so I can start programming
dates with 2-digits again."
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