IPFilter is the most powerful filter/nat tools in my opinion. Thanks to Mr. Darren Reed granted me to port and redistribute (in source and binary) IPFilter to QNX community.

If you don't know what is IPFilter, visit the offical site here. Current ported version is 3.4.6, a 3.4.23 port is ready for next version of RTP.

Both Source package and Binary package could be download here.

A patch of Builtin H323 Proxy is here, it could be apply to IPFilter 3.4.23 (I haven't tried it on any OS other then QNX RTP though).

Another patch of MSS Clamping also availabe. This is also a patch for IPFilter 3.4.23.