Creating IP Tunnels in Linux with iproute2

Tue, 04 Feb 2020 07:40:31 +0000

Creating IP Tunnels in Linux with iproute2

In this post we’ll use iproute2 to create tunnels between two unix hosts. This will be the simplest form of an IP-in-IP tunnel.

How the Tunnels will work

In this example we have two Unix hosts with IP addresses 10.255.254.96 and 10.255.254.196 on a 10.255.254.0/24 network and a gateway address of 10.255.254.2. These two hosts are on the same network. For this tunnel example we are going to add dummy interfaces to each of our hosts and assign addresses 192.168.2.111 and 192.168.2.222 addresses to each of them respectively. Once the tunnels are up we will be able to send a ping from the first tunnel to the second tunnel as if the hosts are on the same network. This is known as encapsulation, since inside an IPv4 packet with a source of 10.255.254.96 and destination of 10.255.254.196 we have another IPv4 packet encapsulated inside with a source of 192.168.2.111 and destination of 192.168.2.222.

Iproute2 on Lloyd Rochester's Geek Blog

Creating IP Tunnels in Linux with iproute2

Creating IP Tunnels in Linux with iproute2

How the Tunnels will work