RE: Firewall and DMZ topology

["David Gillett" <gillettdavid () fhda edu>]

> -----Original Message-----
> From: Chris Berry [mailto:compjma () hotmail com]
> I'm afraid I don't see how that:
>
> internet --> Firewall --> Lan
>
> internet --> Firewall --> DMZ

  Actually, it's

internet <-- Firewall <-- LAN
 
internet --> Firewall --> DMZ

> would be any more secure than this:
>
> internet --> Outer Firewall --> DMZ --> Inner Firewall --> LAN

internet <--> Outer Firewall <--> DMZ <-- Inner Firewall <-- LAN

(no more secure, and slightly inefficient

 
> or this:
>
> internet -->  Firewall --> LAN
>                              --> DMZ

internet <-->  Firewall <-- LAN
                  |
                  V
                 DMZ

which uses a single (3-legged) firewall box and doesn't force
traffic from LAN to DMZ to transit the Internet (or vice versa)
as the alternatives above do.

  (The arrowheads, as I've indicated them above, reflect directions
of allowed session initiation.)

David Gillett

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