YvEs2005

topology :

    Site A                                                                                          Site B

 Lan(192.168.2.100/24)-----Wan(2001::20) ----------- wan (2001::21)-------Lan(192.168.3.10/24)

Site A:

4in6 insert module:
cd /lib/modules/`uname -r`
cd kernel/net/ipv6
insmod tunnel6.ko
insmod ip6_tunnel.ko

ds-lite command:
ip -6 tunnel add tun0 mode ipip6 local 2001::20 remote 2001::21

ip link set dev tun0 up

route -A inet add -net 192.168.3.0/24 dev tun0

Site B:

4in6 insert module:
cd /lib/modules/`uname -r`
cd kernel/net/ipv6
insmod tunnel6.ko
insmod ip6_tunnel.ko

ds-lite command:
ip -6 tunnel add tun0 mode ipip6 local 2001::21 remote 2001::20

ip link set dev tun0 up

route -A inet add -net 192.168.2.0/24 dev tun0

Test:

Site A : ping -I 192.168.2.100  192.168.3.10