Transparent FW: PF+briging mode

[Jordi Espasa Clofent]

Hi all,

I'm planning to build a transparent FW using PF+bridging mode; the 
network arquitecture will be:

[Internet] <-> ( xl0 ) <bridge> ( xl2 ) <-> ( switchs ) <-> (clients 
with /23 public IPs )

I've read a lot in this list and other places about some problems with 
bridging mode and PF; but I don't understand exactly where is the 
problem. Maybe it's an old problem solved at present moment, because 
these post were is 2004/2005 and related to 5.x:

http://lists.freebsd.org/mailman/htdig/freebsd-pf/2005-August/001369.html
http://lists.freebsd.org/mailman/htdig/freebsd-pf/2005-January/000745.html
http://lists.freebsd.org/pipermail/freebsd-pf/2005-November/001697.html

My questions are:

¿Is possible to build the commented arquitecture with _ALL_ pf features 
available?
¿Can the FW (pf) inspect and act on the packets which pass through the 
bridge with clients as final destination?
¿Are there differences related to this problem in using 6.x or 7.x branches?


-- 
Thanks
Jordi Espasa Clofent