What are different approaches for address translations and which approach in your opinion should be preferred and why?
closed as not a real question by EEAA, John Gardeniers, Ward, splattne♦ Apr 19 '10 at 6:49
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"Address Restricted Cone" and its bretheren were names given to theoretical types of NAT that were described in the STUN protocol. As far as I'm aware none of them made it past a piece of paper.
Everything (and more) you can learn about NAT is currently on the wikipedia artical. Normally I hate linking to Wikipedia, but in this case it's probably going to be far more educational than here.