<> Firewall <> LAN
internet <> router
<> Firewall <> DMZThe other would have your firewall and then DMZ. You can then deny all traffic with a source add from the DMZ going to a dest of your LAN. This still wouldnt stop traffic originally coming from the LAN as im assuming you would be using NAT so the source address would be the routers external interface and it was initiated by the LAN. Hopefully this sugestion makes sense however routers with 2 10/100 network ports can be rather expensive.
Anyways thats my 2cents
Aaron
Des Ward wrote:
The first one does not have to use two separate firewalls, just have an extra NIC to segment the LAN and DMZ.
You bottom two examples are as follows:
The first one is far too complex and was how I thought a DMZ was supposed to be until I realised that it just wasn't needed.
The second means that all traffic has to traverse your LAN to get to the 'Unprotected' DMZ systems and also could leave your internal LAN open to attack.
The main thing to remember is that the DMZ is designed to be accessible to the outside world. You do want this segmented from the rest of the LAN in the easiest way possible.
Just my .002667 cents worth (After converting from the BRITISH and not ENGLISH pound)
-----Original Message-----
From: Chris Berry [mailto:[EMAIL PROTECTED] Sent: 10 June 2003 01:53
To: [EMAIL PROTECTED]
Subject: Re: Firewall and DMZ topology
From: Christopher Ingram <[EMAIL PROTECTED]>
So, the below setup is not decent for a corporate LAN. Ideally, the DMZ should sit on a seperate connection to the Internet from the rest of the network, using a different ISP and therefore, different IP block. This provides the most isolation.
I'm afraid I don't see how that:
internet --> Firewall --> Lan
internet --> Firewall --> DMZ
would be any more secure than this:
internet --> Outer Firewall --> DMZ --> Inner Firewall --> LAN
or this:
internet --> Firewall --> LAN --> DMZ
which are the setups that I've seen. Can you give some justification/explanation on why you think that would be better?
Chris Berry [EMAIL PROTECTED] Systems Administrator JM Associates
"All I want is a few minutes alone with the source code for the universe and
a quick recompile."
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