&gt; The amount of crap that needs done to get ip2ip communications working and other multiport protocols is stupid and introduces piles of security risks.<p>I&#x27;m sorry, but you are naive if you think that NATs will go away with IPv6 or that the absence of NATs would make it safer.  In fact, NATs have found a way back to IPv6 and any deployment I have seen with IPv6 that was not done by a university actually goes through a NAT.