connection limit with ipfw

Hello folks,

  I'm trying to set up a ruleset that limits every user to X tcp 
connections, since I have 300 active users on each server. I've been trying 
to work it out with the ipfw limit but I really don't know how effective it 
is.

For example:

  ipfw -q add 15 allow tcp from me to any 80 limit dst-port X keep-state out 
setup

Will this limit the whole machine to X connections that match the rule? I 
wanted to build somehting that would limit every user to X conns without 
having one rule for each user using the "uid" directive.

Thanks for your precious help.
Regards,
Carl

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