ipfw fwd doesn't handle ipv6 addresses

[gumbo at bsdmail.org]

I'm running freebsd 7.2 and trying to find a way to forward a packet based on it's source address.
The following command works fine for ipv4 addresses but fails for ipv6 addresses.
ipfw add 101 fwd nextaddr ip from myaddr to any out
This works fine if nextaddr and myaddr are ipv4 but fails to work if they are ipv6.
Is this not yet supported or is there another way to accomplish the same thing ?

Thanks for any insight,
Rick