I am wondering if you have planed to support some IPv6 features of FreeBSD
I think that the following features could be interesting:
- regular IPv6 address on the interfaces and IPv6 autoconf (rtadvd support)
- XinY ( IPv6 or IPv4 configured tunnel over IPv6 or IPv4 -> gif support)
- 6to4 (stf)
- IPv6 IPSec (supported by Racoon)
All of them are already supported by FreeBSD since the 4.x releases.