#!/usr/bin/env bash
#
#  - create GRE tunnel between two servers
#

####### FREEBSD #######

PATH="/bin:/usr/sbin:/usr/bin:/sbin:/usr/local/bin:/usr/local/sbin"
TUNNEL_IF=gre10

# exit node
LOCAL_ADDR_EXT=88.32.99.91
LOCAL_ADDR_INT=10.254.20.1

# entry node
REMOTE_ADDR_EXT=162.210.201.13
REMOTE_ADDR_INT=10.254.10.1

#######################

# create interface
ifconfig "$TUNNEL_IF" create

# setup internal address on interface
ifconfig "$TUNNEL_IF" "$LOCAL_ADDR_INT" "$REMOTE_ADDR_INT" link1

# up tunnel
ifconfig "$TUNNEL_IF" tunnel "$LOCAL_ADDR_EXT" "$REMOTE_ADDR_EXT"

# add route to entry node
route add -net "${REMOTE_ADDR_INT%.*}" -netmask 255.255.255.0 "$LOCAL_ADDR_INT"