what's wrong in userland natd?
Performance. With userland natd, every packet that passes through natd
must pass from kernel to userland (causing one context switch) and back
again (causing another context switch). This will be slower and use more
CPU than doing it all inside the kernel, without any context switches.
true, anyway for my two 2Mbps symmetric connection (all for nat), and
three 4/0.5Mbit connections (part for nat, mostly for squid) all natd
processes takes at most 3 percent of single core (core2duo).
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