Great Circle Associates Firewalls
(February 1997)
 

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Subject: Blocking modems
From: Steve Marak <SAMARAK @ UAFSYSB . UARK . EDU>
Date: Sat, 01 Feb 97 10:04:20 CST
To: Firewalls mailing list <firewalls @ GreatCircle . COM>

>Random thought: would it be possible to insert a (hardware) filter
>on incoming lines to block modem signalling frequencies? This would
>not disturb voice traffic but might be an effective solution. Modern
>modems

This occurred to me about 6 years ago and I've been trying ever since to
find a product/service/vendor who could implement it for me, with no
luck. I've asked a lot of people at conferences and such, too. Usually
their answer was that it seemed quite logical and surely someone *ought*
to provide something, but they didn't know specifically of anything.

Some of our AT&T contingent assured me that the newer high-end switches
could be configured to do this, but so far none of the technical people
seem to know how.

If someone out here does know of something along this line, please include
me in the reply if you don't post to the list.

Apologies to the list at large for continuing this (at best tangential)
topic - it's been a thorn in my side for a long time.

Steve


-- Steve Marak
-- SAMARAK @
 UAFSYSB .
 UARK .
 EDU

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