Chapter 5. GRE and other tunnels

Table of Contents

5.1. A few general remarks about tunnels:

5.2. IP in IP tunneling

5.3. GRE tunneling

5.3.1. IPv4 Tunneling

5.3.2. IPv6 Tunneling

5.4. Userland tunnels

There are 3 kinds of tunnels in Linux. There's IP in IP tunneling, GRE tunneling and tunnels that live outside the kernel (like, for example PPTP).