Environment: (freebsd 9.0)
192.168.0.100/24 ------lan ----- wan (ipv6 :2001:238:300::200/64) --------Internet ------------wan (ipv6 : 2001:238:300::100/64) -----------------lan :192.168.4.100/24
1. ifconfig gif0 create
2. ifconfig gif0 inet6 tunnel 2001:238:300::200 2001:238:300::100 prefixlen 128
3. ifconfig gif0 up
4. route add -net 192.168.4.0/24 -interface gif0
test : from local use ping -S 192.168.0.100 192.168.4.100 , should get reply packet from remote lan site
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