> Could be TCP window scaling. See
> http://en.wikipedia.org/wiki/TCP_window_scale_option
> Or the plain old PMTUD problem described in
> http://www.cisco.com/en/US/tech/tk870/tk877/tk880/technologies_tech_note09186a008011a218.shtml#backinfo
> =Adriaan=

Nothing helps.
I've tried to change client's mtu, even shrinked packets with ng_tcpmss - no effect. I don't understand why freebsd machines from internal network can't establish any TCP connection to external net too.
Can ipfw or netgraph detect client's OS type and allow only Windows XP ? =))
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