A quick test during lunch tio show that m0n0wall 1.3b doesn't even boot my actual generic pc, that run pfSense … Bummer, I tested it on VMWare and yes there is place to configure the IPv6 Tunnel in the WAN configuration, than you have the option to enable radvd on the LAN and this actually works pretty well, all my test IPv6 clients Workstation got their IPv6 address within the range instantly ...Since my VMWare test was behind a router that doesn't support IPv6-to-IPv4 Protocol 41 (the test was conducted at work) I could not test actual connectivity to my broker, but I was gettin a reply from m0n0 then nothing obviously blocked by the work router.
If m0n0 did it, it should be very hard to port their setup into pfSense...
MageMinds