show all remote users

at your server type in:
who <enter>

is that show all connected users
thru telnet,x11 etc.
what about users that connected
to my server thru application.

tq

Well, you can use the following command to see the connetion between you server and the other machine:

netstat -a | grep `uname -n` | sort

This will give you an idea what machine is connet to your server and what ports are used. Some time is hard to tell who is using the application.

w, who, or rwho (if rhod is running) to show login sessions (telnet, rsh, ssh)
netstat -an|grep ESTABLISHED
  for any application

what about if somebody is accessing my machine through nfs ..?


msnr

msnr, NFS:
as long as the connection (means traffic) is established, you see connects to port 2049 (or whatever is configured).
The same problem applies to any connection controlled by the portmapper, you need to use tcp_wrapper to control it.

It is very hard to tell who is using NFS.

can fuser help us in this regard.?

msnr

fuser will, if at all, only report local users

another good tool for listing network connections to your machine is lsof.

show all (i)nternet network connections
lsof -i

show all ssh(port 22) connections
lsof -i :22

you can get it as a package from http://www.sunfreeware.com/

question is about users, not hosts

i think i'll use ahoffman suggestion
for the time being.

netstat -an|grep ESTABLISHED
 
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