pf nat & ipfw kernel nat & ng_nat - what uses less computer resources?

[Nikolay Dmukha]

Thanks for your reply. 
I think I`ll use ipfw kernel nat. But first I would like to test nat through
iptables in Linux to compare the results. I read that in iptables there is
some special option (config_ip_nf_conntract). It is very interesting for me
what is the difference in work with and without this option.
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