Hi All, I have a system setup where i want to send ipv4 packets over ipv6 n/w. I suppose this feature has been recently added in 2.6.22. So iam using that kernel. My setup: (eth0) (eth1) (eth1) (eth0) ----| RT1 |------------| RT 2 |---- RT1 : eth0 192.168.1.1 eth1: 3001:470:1f00:ffff::190 RT2: eth0: 172.16.15.1 eth1: 3001:470:1f00:ffff::189 I created a tunnel using ip6_tunnel, which i believe has this support. RT 1: #ip -6 tunnel add mytun remote 3001:470:1f00:ffff::189 local 3001:470:1f00:ffff::190 dev eth1 #ip link set dev mytun up #ip -6 addr add 4001:470:1f00:ffff::190 dev mytun #route add -net 192.168.1.0/24 mytun RT2: #ip -6 tunnel add mytun remote 3001:470:1f00:ffff::190 local 3001:470:1f00:ffff::189 dev eth1 #ip link set dev mytun up #ip -6 addr add 5001:470:1f00:ffff::190 dev mytun #route add -net 172.16.15.0/24 mytun With this i thought i can ping from 192.x.x.x to 172.x.x.x and vice versa. But its not happening :(. Iam not sure why. When i capture packets on the eth1 interface, i dont see packets coming out. Please help. btw, i have enabled fwd for ipv6 and ipv4 also and flushed all ip6tables and iptables rules just in case. Regards, Varun - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html