07-04-2001
On my systems, <B>netstat -en </B> provides the kernel level user of the sockets (tcp, unix) , not the application level user (i.e john, harry, sally, root).
Working to automatically set the X display parameter is normally not performed with shell utilities such as netstat; but passed as environmental varialble during remote login. This is a function of the remote login protocol.
Some versions of telnet automatically set the DISPLAY variable, so that when you login remotely, DISPLAY is set and exported for X to use. However, your problem seems to be that this works for you already, but you have DNS issues.
I think it is possible to have the remote login session pass the IP| address in the DISPLAY environment variable. There is no reason to only pass the FQDN to $DISPLAY.
As a matter of fact, if you have your remote users set the IP address in their HOSTNAME environment variable before remote login (or do this is the login script); then you will not have to worry about the DNS issues.
HOSTNAME = 111.222.333.444
DISPLAY = $HOSTNAME:0.0
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XON(1) General Commands Manual XON(1)
NAME
xon - start an X program on a remote machine
SYNOPSIS
xon remote-host [-access] [-debug] [-name window-name] [-nols] [-screen screen-no] [-user user-name] [command ...]
DESCRIPTION
Xon runs the specified command (default xterm -ls) on the remote machine using rsh, remsh, or rcmd. Xon passes the DISPLAY, XAUTHORITY and
XUSERFILESEARCHPATH environment variables to the remote command.
When no command is specified, xon runs 'xterm -ls'. It additionally specifies the application name to be 'xterm-remote-host' and the win-
dow title to be '-fIremote-host'.
Xon can only work when the remote host will allow you to log in without a password, by having an entry in the .rhosts file permitting
access.
OPTIONS
Note that the options follow the remote host name (as they do with rlogin).
-access
Runs xhost locally to add the remote host to the host access list in the X server. This won't work unless xhost is given permission
to modify the access list.
-debug Normally, xon disconnects the remote process from stdin, stdout and stderr to eliminate the daemon processes which usually connect
them across the network. Specifying the -debug option leaves them connected so that error messages from the remote execution are
sent back to the originating host.
-name window-name
This specifies a different application name and window title for the default command (xterm).
-nols Normally xon passes the -ls option to the remote xterm; this option suspends that behaviour.
-screen screen-no
This changes the screen number of the DISPLAY variable passed to the remote command.
-user user-name
By default, xon simply uses rsh/remsh/rcmd to connect to the remote machine using the same user name as on the local machine. This
option cause xon to specify an alternative user name. This will not work unless you have authorization to access the remote
account, by placing an appropriate entry in the remote users .rhosts file.
BUGS
Xon can get easily confused when the remote-host, user-name or various environment variable values contain white space.
Xon has no way to send the appropriate X authorization information to the remote host.
XFree86 Version 4.7.0 XON(1)