Great Circle Associates Firewalls
(January 1994)
 

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Subject: Re: TALK - any known problems with allowing access from the outside
From: Sean . Bennett @ UK . Sun . COM (Sean Bennett - Sun UK - CS Hotline Engineer)
Date: Wed, 26 Jan 94 09:28:06 GMT
To: Firewalls @ GreatCircle . COM, mwblas @ nicsn1 . monsanto . com

{}  
{}  	Currently, we have TALK blocked, but I have a user who needs/wants
{}  	to be able to use talk to communicate with a collegue outside
{}  	of our network.  Any big problems with allowing this access?
{}  

If someone wants to be a pain they can send username field that holds
control codes that act on xterms to segv them (X11R5) and find out that
root/firewall/etc. is not logged in.

A possibly better soloution is irc - that way your machines still hide behined
a fire wall but the server processes on your gateway machine passes the 
application specific packets - also the Client to Client protocol (the only 
real danger with irc) is blocked by your existing firewall. IRC is PD with
source available.


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