Firewall Wizards: Multiple firewalls from different manufactureres

["Shimon Silberschlag" <shimons () bll co il>]

Hello Group,

In the past, I used to hear the recommendation that an internet facing 
firewall setup should include at least 2 firewalls from different 
manufacturers. The reasoning behind it was that if you had a fatal 
vulnerability in one of them, one that could enable an attacker to "own" the 
first, the second one will resist a similar attack.
Today, when attacks are shifting towards using the already open ports on the 
firewall, at the application level, do you think that such a setup is still 
mandatory and/or recommended? Do you see such setups implemented? Or does 
most setups include a single FW with multiple DMZs, connected directly to 
the internal network? Perhaps the screened subnet variety with 2 FW, but the 
same brand, is the most popular?
TIA,

Shimon Silberschlag

+972-3-9351572
+972-50-7207130

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