Take a look at https://github.com/ayourtch/nat46 https://github.com/ayourtch/nat46 - I've coded it primarily for OpenWRT (so it requires forwarding), but the co

Take a look at https://github.com/ayourtch/nat46 https://github.com/ayourtch/nat46 - I've coded it primarily for OpenWRT (so it requires forwarding), but the core portion is usable in userland as well - so I have this crude hack (https://github.com/ayourtch/example-nat46/ https://github.com/ayourtch/example-nat46/) to get something-of-a-CLAT running on OS X with zero changes to the nat46-core.[ch] code - I literally sync them between the two repos periodically.