ipip

参考资料

• Tunnels over IP in Linux-2.2: http://linux-ip.net/gl/ip-tunnels/ip-tunnels.html

• Tunnel setup: basics: http://linux-ip.net/gl/ip-tunnels/ip-tunnels-node4.html

• IP in IP tunneling: http://www.tldp.org/HOWTO/Adv-Routing-HOWTO/lartc.tunnel.ip-ip.html