Great Circle Associates Firewalls
(December 1996)
 

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Subject: Re: Serially connected firewalls and FTP
From: Jim . Egan @ iai . com@scet.org.uk (Jim . Egan @ iai . com)
Organization: SCET
Date: Fri, 6 Dec 96 11:00:21 -0000
To: firewalls @ greatcircle . com

Mix, S.R. recently wrote:
> 
> 
> Hi:
> 
> We are attempting to determine how to get FTP sessions established 
> end-to-end  between multiple networks, each protected by a firewall:
> 
> +-----+               +------------+               +--------+
>   |   |                  |       |                  |    |
> +--+  |   +----------+   |       |   +----------+   |  +------------+
> |PC|  +---|FireWall a|---+       +---|FireWall b|---+  | FTP server |
> +--+      +----------+               +----------+      +------------+
> 
> FireWall b is a TIS Firewall Toolkit Version 2.0
> 
> FireWall a so far has been an Eagle Raptor or another TIS FWTK.
> 
> The question is:
> 
> how does a user on the "PC" (which might include a UNIX command line) 
> connect through the two firewalls to the FTP server?
> 
> Thanks,
> Scott R. Mix
> PJM Interconnection Association
> 

I do this all the time.  The procedure below assumes you are using weak
authentication and anonymous FTP is OK at Server.

>From PC do "ftp FW-a".
At the FW-a proxy prompt logon as "ftp @
 FW-b".
At the FW-b proxy prompt logon as "ftp @
 server".
At Server password use "user @
 PC".

/Jim/
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