Great Circle Associates Firewalls
(January 1995)
 

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Subject: Re: PC using external service
From: Joe Provo <jprovo @ ultranet . com>
Date: Thu, 5 Jan 1995 19:49:43 -0500
To: firewalls @ greatcircle . com

jak @
 pot .
 hole .
 fi:
>        You have a closed 1200+ PC-machine LAN, connected to the Net thru
>      a BSDI+Firewall.  One PC-end user in his days of wisdom decides to
>      purchase a SLIP-connection to a local INet provider.  He enables "IP
>      Routing" from his Windows for Workgroups, and someone on the net "sees"
>      or hears about this, and decides to route himself into the "firewalled"
>      network thru this machine... Boom.
>      
>        I couldn't think of an easy way to disable this possibility, other
>      than telling the end user not to do this.  Any hints/ideas?
The answer, I think, would lie in 
	- only stocking your LAN with single-address/single-interface PCs
	- only responsible and competent providers existing

Unfortunately for the industry, the latter is not as likely as the the former.

[comments about those who would route arbitrary networks on their system
undermining their own security (and business) deleted]

Joe Provo

       Systems and Network Admin, UltraNet Communications Inc.
  508.229.8400(voice)      jprovo @
 ultra .
 net      508.229.8111(data)
  A network service provider in Marlboro, MA  mailto:info @
 ultra .
 net   

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