#! /bin/bash ip tunnel add 6to4_To_KH mode sit remote kkk local iii ip -6 addr add aaa/64 dev 6to4_To_KH ip link set 6to4_To_KH mtu mtu_kh ip link set 6to4_To_KH up ip -6 tunnel add GRE6Tun_To_KH mode ip6gre remote bbb local aaa ip addr add 172.20.20.1/30 dev GRE6Tun_To_KH ip link set GRE6Tun_To_KH mtu mtu_i ip link set GRE6Tun_To_KH up sysctl net.ipv4.ip_forward=1 iptables -t nat -A PREROUTING -p tcp --dport 22 -j DNAT --to-destination 172.20.20.1 iptables -t nat -A PREROUTING -j DNAT --to-destination 172.20.20.2 iptables -t nat -A POSTROUTING -j MASQUERADE exit 0 #! /bin/bash ip tunnel add 6to4_To_IR mode sit remote iii local kkk ip -6 addr add bbb/64 dev 6to4_To_IR ip link set 6to4_To_IR mtu mtu_kh ip link set 6to4_To_IR up ip -6 tunnel add GRE6Tun_To_IR mode ip6gre remote aaa local bbb ip addr add 172.20.20.2/30 dev GRE6Tun_To_IR ip link set GRE6Tun_To_IR mtu mtu_i ip link set GRE6Tun_To_IR up exit 0 sudo nano /etc/rc.local && sudo chmod +x /etc/rc.local