What's the "bridged" option in ipfw's man page ?

[Supote Leelasupphakorn]

Hi... lists,

  I've read the "ipfw" man page and in the "RULE OPTION"
There is "bridged" option there. I'm currently set the
bridge-base firewall so my question is what's the bridged
packets and how much I take advantage from this option ?

TIA,
pjn

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