I have noticed that when I use some p2p file sharing programs, Kazaa more specifically, that some udp traffic is able to slip back through my OpenBSD box running nat/pf. I was curious if this is because I use a "pass out on $Ext proto udp all keep state" rule, and traffic initiated by me is allowed to return, or is there is some other reason? I don't allow any incoming traffic other than ssh. Thanks for any info.
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