Some problems of IP6FW on FreeBSD 8.0-RELEASE

[Bear]

hi all,
I am a newbie on IPv6. I wanna to build a IPv6 Gateway on FreeBSD 8.0-RELEASE. Thought this gateway need to do some limitations on its clients(It works in a university networks. At least, User Authentication and Bandwith Limitation must be implemented). I wanna to use a Captive Portal to do user authentication and use ip6fw and dummynet to do bandwith control. But in my GENERIC kernel, it seems that there is no ip6fw available.When I type in ip6fw, it told me this:

freebsd6# ip6fw
ip6fw: Command not found.
freebsd6#

So I wanna know is the ip6fw has been compiled into the GENERIC kernel? If not, how can I compile it into kernel or as a loadable kernel module? And what about the dummynet? If dummynet unavailable, can you give me some advises to limit bandwith?
thanks!

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Bear
2010-05-17