Great Circle Associates Firewalls
(April 1994)
 

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Subject: Re: X3270 through firewall
From: sangster @ reston . ans . net (Paul Sangster)
Date: Mon, 11 Apr 1994 11:08:06 +0500
To: firewalls @ greatcircle . com

Yves .
 Dherbecourt @
 der .
 edf .
 fr (Yves Dherbecourt) writes:

|> 
|> Did somebody get X3270 work through a firewall WITH authentication set on
|> this firewall ? and How ?
 
Yes, the current version of the InterLock gateways 3270 over a telnet connection
for clients that follow the RFCs.  However some clients seem to come up and 
by default insist upon 3270 data stream formats which makes it tougher.  The
next version of the InterLock will also support these types of clients.
 
|> 
|> X3270 works on the telnet port, but it doesn't seem fair 
|> enough to handle properly the authentication dialog with the firewall 
|> before launching the real X3270 session. (Tn3270 does).
 
The problem is that in order for your gateway to talk to a 3270 client that
is emulating 3270, you will need to have the gateway properly negotiate the 
appropriate telnet options (eg. EOR, Term Type).  Then your gateway has to be
able to send and receive properly formatted 3270 data streams for displaying 
and retrieving information.
 
|> 
|> #---------------------------------------------------------------------------#
|> # Yves Dherbecourt                    |  Tel : (1) 47 65 37 90              #
|> # Electricite de France               |  Fax : (1) 47 65 35 23              #
|> # DER / IMA / ICI / ASR               |  Tlx : 631576                       #
|> # 1, avenue du General de Gaulle      |                                     #
|> # 92141 CLAMART Cedex                 | Email : Yves .
 Dherbecourt @
 der .
 edf .
 fr #
|> # France                              |                                     #
|> #---------------------------------------------------------------------------#
 
____________________________________________________________________________
                                Paul Sangster 
Advanced Network & Services                          Software Engineer
1875 Campus Commons Dr.                              sangster @
 reston .
 ans .
 net
Suite 220,  Reston VA 22091                          (703) 758-7706
____________________________________________________________________________

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