How to Configure IPv4 Over IPv4 Tunnels

1. Become Superuser.

2. Create the file /etc/hostname.ip.tunn. Use the values 0, 1, 2, and so on, for n. Then, add entries by following these steps.

   1. Add the tunnel source address. Then, add the tunnel destination address.

      tsrc IPv4-source-address tdst IPv4-destination-address tunnel-IPv4-source-address tunnel-IPv4-destination-address up

   2. (Optional) Add a logical interface for the source and destination IPv4 addresses.

      addif IPv4-source-address IPv4-destination-address up

When you finish configuring the tunnels, you must reboot.

You must perform the same steps at the other end of the tunnel for bidirectional communication to occur.

If your system is to be configured as a router, you must also configure your router to advertise over tunneling interfaces before rebooting. See How to Configure Your Router to Advertise Over Tunneling Interfaces.

Example—Entry in the IPv4 Configuration File to Create an IPv4 Over IPv4 Tunnel

This example shows the entry for an IPv4 over IPv4 tunnel.

tsrc 120.46.86.158 tdst 120.46.86.122
10.0.0.4 10.0.0.61 up