Debugging nat. it's, well, unpleasant. ipv6 has a whole lot more address space than ipv4. it obviates the need for nat. i think the standard deal is a /64 for your router. you can roll addresses every half hour forever, if you want to.

nat is just a bunch of glued together heuristics about how things should work. it's not fun to debug. i mean, you have 2^32 internets worth of space to assign to machines. everything is so much simpler without nat.

i dunno. maybe i'm an idiot. maybe nat is super cool, and i'm just jaded. imho it makes things very difficult. but i'll defer to the majority. whether i want to or not.

One of the hopes for IPv6 was that it'd deliver us from IP address scarcity and hence the need for NAT and all the associated difficulty of NAT traversal.

This is what I thought -- why would you neet Network Address Translation (NAT) when the address space is big enough to have everyone have an individual address? No need to traverse a router, it just becomes another hop in the chain.

Another positive (unintended) consequence of needing NAT everywhere is that it means most devices end up behind some sort of firewall by default.