Use OpenWRT to tunnel traffic to remote site

tunnel.sh

#!/bin/sh

REMOTE="tunnel-host -p 9099"
REMOTE_NET="192.168.1.0/24"
TUN=5
IF="tun$TUN"
SSH_OPT="-c arcfour256 -o Protocol=2 -o ServerAliveCountMax=2 -o ServerAliveInterval=5 -o ConnectTimeout=5"

echo $SSH_OPT
sleep 15 # Wait for device bootup

while [ 1 ]; do

        echo "Closing old connections"
        ssh $REMOTE $SSH_OPT -C "killall -9 sleep &"

        sleep 2 # Wait for old tunnels to close

        echo "Opening tunnel"
        ssh -w5:5 $REMOTE $SSH_OPT -C "ifconfig tun5 10.0.1.1 netmask 255.255.255.252 && sleep 999999999" &

        sleep 15 # Wait for tunnel to come up

        echo "Configure tunnel"
        ifconfig $IF 10.0.1.2 netmask 255.255.255.252
        route add -net $REMOTE_NET gw 10.0.1.1
        iptables -t nat -D POSTROUTING -o $IF -j MASQUERADE
        iptables -t nat -A POSTROUTING -o $IF -j MASQUERADE
        iptables -I FORWARD 1 -o $IF -j ACCEPT
        iptables -I FORWARD 1 -i $IF -j ACCEPT
        echo "Connection is up"

        # Wait until connection fails
        wait

        echo "Connection collapsed"
        killall ssh

done