#! /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