gif + ipfw + dummynet for IPv6

[Hideki Yamamoto]

Hi,

I am trying to build test environment for IPv6 enable terminal 
by using of several FreeBSD boxes as follows:

 {server]--<ipv6>--[FreeBSD box]--<IPv4>--[FreeBSD box]-<IPv6>--[Term]

We plan to use gif interface to transfer IPv6 packet and 
shape the trafic by dummynet on IPv4 interface of FreeBSD box.

Before building the environment and testing, I would like to
search for information about feasibility of this test.

I appreciate if anyone try this type of test environment and 
inform us of the experience.

Best regards,

Hideki Yamamoto