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Re: Internet Edge and Defense in Depth
From: Robert Brockway <robert () timetraveller org>
Date: Wed, 7 Dec 2011 09:20:05 +1000 (EST)

On Tue, 6 Dec 2011, Holmes,David A wrote:

Some firewall vendors are proposing to collapse all Internet edge functions into a single device (border router, firewall, IPS, caching engine, proxy, etc.). A general Internet edge design principle has been the "defense in depth" concept. Is anyone collapsing all Internet edge functions into one device?

Hi David. A principle of network firewall design has long been that you want to minimise services (proxy, etc) running there as they can be a vector for attack against the firewall itself.

In the end this is about risk analysis. In most cases I would recommend against loading the firewall with additional functionality, for a variety of reasons. In some cases it may make sense to do so.

This is completely separate to whether servers should even have a firewall or IPS in front of them. That's another (interesting) discussion :)

Cheers,

Rob

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