NAT performance tweaks

[Clement Laforet]

> 
> Would certainly be nice to make it as a sysctl. It's a pain in the ass
> to edit it manually everytime I cvsup. :/

Using a sysctl variable is a BAD idea for NAT table. If this variable is
if it can be) modified, all the NAT table must be reinitialized, because
of hash key. You should have a table size which minimizes hash
collisions, and then avoids loops and/or hypothetical race conditions.


clem