Great Circle Associates Firewalls
(November 1996)
 

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Subject: Re: Firewall & Masquerading
From: Rens Schipper <Rens . Schipper @ rivm . nl>
Date: Tue, 12 Nov 1996 08:16:19 +0200
To: tech @ cic . qc . ca
Cc: Firewalls @ GreatCircle . com


  If your firewall has no daemons listening how can it know when to pass a
  packet?
  You have to have some daemons running but run only the one you can check
  and
  understand.

  If there is no server behind your "firewall", why don't you just use a
  packet screen (in a
  already used router?) and block everything except packets that belong to
  outgoing sessions?

  Firewalls are evented (amongst other things) to protect inside server
  deamons and as
  you don't have these there is no need to use a firewall.
  Save you a lot of money and headbreaking on configuring one!

  Just my 2 cents,

  Rens


                                                                    
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  To:   Firewalls @ GreatCircle.COM
  cc:    (bcc: Rens Schipper/NOTES4/NL)
  Subject:  Firewall & Masquerading


  Hi,
  I'll be setting up a firewall soon, and I have a few questions

  First of all, inside the firewall there will be no server, so there's no
  reason for any incoming connection. But we don't want to limit anybody on
  the inside (everybody is trusted).

  In this case, can a Unix box with IP Masquerading which blocks IP
  source routing secure ?
  The firewall itself should be secure : no daemon listening to any
  port....

  Any comment ?


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