tcp/ip port address

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From: Jeff Liebermann <jeffl@comix.santa-cruz.ca.us>
Newsgroups: comp.unix.sco.misc
Subject: Re: Can I get the TCP port as well as the address for Telnet session
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On Tue, 14 Mar 2000 17:04:49 +0000, simon at ccomms dot demon dot co
dot uk (Simon Hobson) wrote:

>I know I can get the client address for a login with 'who -xu' or 'who
>-mxu', does anyone know if it is possible to get the TCP port number of the
>client end ?
>
>The reason I ask is that we use a number of terminal servers (Bay Annex),
>and so a number of users will appear at one address. BUT it is possible to
>differentiate them by the port number the terminal server uses when
>connecting - eg a user attached to physical port 7 on these servers will
>connect from TCP port 10700 for the first session (then 10701, 10702 etc if
>they use multiple sessions).
>
>I have in mind writing a login script to restrict some users to only use a
>specified terminal and/or restrict some terminals to only certain users.
>Obviously I need to uniquely identify each terminal for this to work.
>
>System is Openserver 5.0.5a

3.2v5.0.5a?  Get some updates from:
        http://www.caldera.com/support/ftplists/osr5list.html
        http://www.caldera.com/support/toolbox/patch.html#osr505
        
Use SNMP for the purpose.  It works from the command line (which is
handy for a shell script) as well as works for your unspecified model
Bay Networks Annex terminal server.

Drivel:  Would you know the secret location of the old Synoptics and
Bay Networks web pages that Nortel conveniently buried when they
bought Bay Networks?

Anyway, read:
        http://www.cruzio.com/~jeffl/sco/snmp_install.txt
for how to install and run SNMP on OSR5.  You do not need Hostmib
installed for this.

Then run:
        snmpstat -nt | grep "ESTABLISHED"
which currently belches:

tcp    192.168.111.5.23       192.168.111.9.1146     ESTABLISHED
tcp    192.168.111.5.23       192.168.111.88.1076    ESTABLISHED  

showing two telnets (port 23) from 192.168.111.9 (my Windoze box) that
is coming from port 1146, and another telnet session from
192.168.111.88 (my RH6.1 box) on port 1076.

You can get the same information from:
        netstat -an | grep "ESTABLISHED"
tcp  0  4  192.168.111.5.23       192.168.111.9.1146     ESTABLISHED
tcp  0  0  192.168.111.5.23       192.168.111.88.1076    ESTABLISHED

I guess using:
        netstat -An | grep "ESTABLISHED"
looks somewhat cleaner.

Using SNMP, you should be able to get the same information directly
from the Annex terminal server.  I need the MIB to determine which
OID's to monitor.

If you want to monitor and graph traffic, user count, etc on your
Annex Terminal server, also see:
        http://ee-staff.ethz.ch/~oetiker/webtools/mrtg/mrtg.html
for MRTG.

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