#!/bin/sh
#
# /scripts/dualwanrouting.sh
# This script is to add dualwan capability on a dual wan"ed linux box.



WAN1IP=x.x.x.74
WAN1GW=x.x.x.73
WAN1NET=x.x.x.74\/30
WAN1ETH=eth0
WAN1TABLENAME=NE

WAN2IP=x.x.x.20
WAN2GW=x.x.x.21
WAN2NET=.20\/30
WAN2ETH=eth2
WAN2TABLENAME=SW

LAN1IP=192.168.20.1
LAN1NET=192.168.20.0\/24
LAN1ETH=eth0


echo "delete the default route"
ip route del default

echo "Adding routes to default table"
ip route add $WAN2NET dev $WAN2ETH src $WAN2IP
ip route add $WAN1NET dev $WAN1ETH src $WAN1IP
ip route add $LAN1NET dev $LAN1ETH src $LAN1IP
ip route add 127.0.0.0/8 dev lo src 127.0.0.1

echo "Setup source IP routing rules for SW (WAN2)"
ip rule add from $WAN2IP2 lookup $WAN2TABLENAME
ip route add $LAN1NET via $LAN1IP table $WAN2TABLENAME
ip route add 0/0 via $WAN2GW table $WAN2TABLENAME

echo "Setup source IP routing rules for NE (WAN1)"
ip rule add from $WAN1IP lookup $WAN1TABLENAME
ip route add $LAN1NET via $LAN1IP table $WAN1TABLENAME
ip route add 0/0 via $WAN1GW table $WAN1TABLENAME

echo "Balancing the outgoing"
ip route add default equalize \
nexthop via $WAN1GW dev $WAN1ETH \
nexthop via $WAN2GW dev $WAN2ETH