Great Circle Associates Firewalls
(December 1997)

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Subject: RE: FireWall for Dial-In Users
From: David Lang <dlang @ diginsite . com>
Date: Mon, 22 Dec 1997 16:19:34 -0800 (PST)
To: mht @ clark . net
Cc: "Stackpole, Bill" <BSTACKPO @ sla . com>, "'otaibi @ sapic . com'" <otaibi @ sapic . com>, "'firewalls'" <firewalls @ GreatCircle . COM>
In-reply-to: <3 . 0 . 3 . 32 . 19971222131953 . 00b90c90 @ pop3 . clark . net>

linux lets you setup filters based on the interface name (i.e. ppp0, ppp1,
etc) so you can firewall a modem port just as you would a ethernet port.

David Lang

On Mon, 22 Dec 1997 mht @
 clark .
 net wrote:

> Another suggestion would be Livingston Enterprises (,
> RADIUS, Portmasters, and Routers.  
> /mht
> At 07:48 AM 12/22/97 -0800, Stackpole, Bill wrote:
> >I don't know of any firewall that support modems as interfaces but most
> >dial-in access servers support user authentication and have the ability
> >to limit the access of the caller.  Cisco using TACACS+ allows you to
> >assign a packet filter (access-list) based on the user ID.  Microsoft
> >also has some filters and security measures that can be applied but
> >nothing that would constitute a "firewall."  My suggestion would be a
> >separate segment off the your firewall for the dial-in server.  Assign a
> >set of unique IP addresses to the dial-in ports and management
> >separately through the firewall.

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