Firewall Wizards: stealth firewalls

[Irwin Lazar <ILazar () burtongroup com>]

I'm reading up a bit on stealth mode firewalls and was wondering what the
industry view is toward these types of boxes.  From my research, stealth
mode firewalls act as LAN switches or bridges, and do not actively modify
the packets they process (such as decrementing TTL).  Is this correct?

It seems there are some obvious advantages to stealth mode firewalls since
they are completely hidden at the IP layer, but I'm wondering if there are
any significant drawbacks.  It seems that products are limited, only Sun's
SunScreen & BSD Linux support this functionality.

Any thoughts?

Irwin
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