Eric, > Eric Rescorla wrote: > The fact that a large number of people have chosen > to use NAT is a strong argument that B>C. (Here's > where the invocation of revealed preference comes in). This is not the point. What you are saying is that since B>C it makes NAT OK. What I am saying (and possibly what Melinda was trying to say) is this: NAT is a necessary evil. I don't challenge the fact that it is necessary (for IPv4) and here to stay but the fact that it is necessary does not make it less evil. Michel.