Great Circle Associates Firewalls
(August 1995)
 

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Subject: Re: Placement of WWW Server - any thoughts?
From: rg @ lim . com (Ron Gilmer)
Date: Thu, 31 Aug 95 09:24:46 CDT
To: ASHARPE @ bass . rssi . com
Cc: firewalls @ greatcircle . com

  > > 
  > > We are installing a Web Server that we want to give the world access to, but 
  > > are not sure of our security architecture yet.  We are kicking around 
  > > several ideas including the idea of only allowing HTTP to pass through our 
  > > FIREWALL if it is destined for the Web server.  We are considering doing 
  > > this by filtering on the Web Server's IP address and HTTP port number.
  > > 
  > > What do you think?  What are the residual risks?
  > > 
  > > Alex .
 Sharpe @
 rssi .
 com
  > > 
  > 
  > It depends on what it's going to be used for. This type of question
  > is somewhat subjective and likely to ignite a holy jihad of 'where
  > to place the web server' banter.  :-)
  > 
  > - paul
  > 
 

Correct on the Holy Jihad war...;>)

My preference has been to place the Web Server on a screened subnet so that
I have yet another defense against it.


 Internet
     \
      +  Router
       \
     ----------                   ------- 
    | Internet |                 |  WWW  |
    | Bastion  |                 |  FTP  | Public Access
    |   Host   |                 |  etc  |
     ----------                   -------
         |                           |
         |                           |
-----------------------------------------------------   Screened Subnet
                       |
                       |
                   ----------
                  | Internal |    Yet another Firewall 
                  | Bastion  |
                   ----------
                       |
                       |
------------------------------------------------------------  Internal Backbone




-rg-

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