config as an exit of "IPv6 over IPv4 tunnel"

[Hashimoto]

Can I configure FreeBSD as an exit of "IPv6 over IPv4 tunnel"?

Let me explain it in detail.
Both hostA and hostB have global IPv4 address.
And hostA has global IPv6 address.
I have installed FreeBSD 7.0 on both hostA and hostB.
Then, I want to config "IPv6 over IPv4 tunnel" from hostB to hostA.
Is it possible?

-- 
Hashimoto Kouki
hsmtkk at gmail.com