Hopefully you are not saying that you plan to disable firewall once you all in on IPv6. This is pretty reckless and bad security practice. And even if your mach

Hopefully you are not saying that you plan to disable firewall once you all in on IPv6. This is pretty reckless and bad security practice. And even if your machines are secure _today_, who says there will not be insecure device tomorrow. So UPnP (or its equivalent) will still be very relevant in IPv6 world. Probably even more as you no longer have stable internal addresses, the prefix comes from your ISP.