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[IPIP] is a very simple method of tunneling [IP] packets over an IP connection. !! Kernel Requirements You need to have ip over ip routing support compiled in or compiled as a module Networking Options -> IP Tunneling (CONFIG_NET_IPIP) !! Userspace Requirements You will also need /sbin/ip (see iproute(8)). This usually comes in a package called iproute (eg [Debian]) or iproute2 depending on your distribution. !! Example Network There are two machines that we want to create a ip over ip link between for some reason. Lets call them Router A and Router B. These routers are both connected to the internet, you will also need a network to use on the tunnel. In the example below Router A and B have addreses in the same subnet, this is not a requirement, you can create a tunnel to a host on the other side of the internet if you want. | Tunnel Network | 192.168.1.0/24 | Router A - IP | 192.0.2.34 | Router A - Tunnel IF | 192.168.1.1 | Router B - IP | 192.0.2.69 | Router B - Tunnel IF | 192.168.1.254 !! iproute sample setup You can call your tunnel whatever you like, substitute <name> for something more descriptive in the examples below !Router A ip tunnel add <name> mode ipip remote 192.0.2.69 local 192.0.2.34 ip link set <name> up ip addr add 192.168.1.1/24 dev <name> !Router B ip tunnel add <name> mode ipip remote 192.0.2.34 local 192.0.2.69 ip link set <name> up ip addr add 192.168.1.254/24 dev <name> !! Debian sample setup !Router A Edit /etc/network/interfaces auto <name> iface <name> inet static address 192.168.1.1 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 pre-up /sbin/ip tunnel add <name> mode ipip remote 192.0.2.69 local 192.0.2.34 post-down /sbin/ip tunnel del <name> Then execute ifup <name> ! Router B Edit /etc/network/interfaces auto <name> iface <name> inet static address 192.168.1.254 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 pre-up /sbin/ip tunnel add <name> mode ipip remote 192.0.2.34 local 192.0.2.69 post-down /sbin/ip tunnel del <name> Then execute ifup <name> !!Testing your tunnel After you have configured your tunnel via one of the examples above you should be able to ping the remote end !Router A ping 192.168.1.254 !Router B ping 192.168.1.1 Both pings should succeed without problems. !!Using your tunnel * You can now use your tunnel - just pretend it's a peice of ethernet between the two computers. * Remember the [MTU] on the tunnel will be lower than normal because of the extra IP header. * You can setup routing and whatever you like over the tunnel. * If you lose your route to the tunnel endpoint, the tunnel will not work either ! See also: [IPIPHowto] ---- CategoryNetworking
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IPIP
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TunnelNotes
IPIPNotes