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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"