# GRE on FreeBSD

This page describes how to configure GRE tunnels on FreeBSD.

## Requirements

- Root access to a FreeBSD system.
- Loaded if_gre.ko or device gre
- A static IPv4 address on both ends if you would like to preserve your sanity.

## Create a temporary gre tunnel

    ifconfig gre$INDEX create
    ifconfig gre$INDEX tunnel $TUNNEL_SRC $TUNNEL_DST
    ifconfig gre$INDEX inet $LOCAL $REMOTE netmask 0xffffffff
    ifconfig gre$INDEX descr $DESCR

## Create a persistent gre tunnel

Add this to your `rc.conf`.

    cloned_interfaces="$cloned_interfaces gre0"
    ifconfig_gre0="10.0.0.1 10.0.0.2 netmask 0xffffffff tunnel 1.2.3.4 5.6.7.8 descr foo"