#!/bin/sh 
# dual gateway using 3 nic and 4 ips with one alias
# isp1 on eth0
# isp2 on eth1
# eth2 = for LAN group1
# eth2:1= for LAN group2
#
# Created by mambang 2007
#
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
IFCONFIG=/sbin/ifconfig
NETWORK=/etc/init.d/networking
IP=/sbin/ip
IPTABLES=/sbin/iptables

NAME="MULTI-GATEWAY"
DESC1="ROUTING TABLE"
GATEWAY1=192.168.1.1
GATEWAY2=192.168.2.1
NET1=192.168.1.11  #ip eth0
NET2=192.168.2.22  #ip eth1
LAN1=10.0.0.1  #ip LAN1 = eth2
LAN2=176.16.0.1 #ip LAN2 = eth2:1
SUB1=192.168.1.0/24  #sub local
SUB2=192.168.2.0/24  #sub local
SUB3=10.0.0.0/24 #subnet client LAN1
SUB4=176.16.0.0/24 #subnet client LAN2
DEV1=eth0
DEV2=eth1
DEV3=eth2
DEV4=eth2 #walaupun kita guna eth2:1 tetapi in real world eth2 yg dibaca


case "$1" in
  start)
	echo -n "Memulakan $DESC1: "
	# Setup source IP routing rules for DSL 1 and DSL 2
	# anda perlu masukkan table ke iproute2 sebelun run script ini
	# echo "1 T1" >> /etc/iproute2/rt_tables
	# echo "2 T2" >> /etc/iproute2/rt_tables

	#Set routing tables for dev and router
	$IP route add $SUB1 dev $DEV1 src $NET1 table T1
	$IP route add default via $GATEWAY1 table T1
	$IP route add $SUB2 dev $DEV2 src $NET2 table T2
	$IP route add default via $GATEWAY2 table T2

	$IP route add $SUB1 dev $DEV1 src $NET1
	$IP route add $SUB2 dev $DEV2 src $NET2

	$IP route add default $GATEWAY1
	$IP route add default $GATEWAY2

	$IP rule add from $NET1 table T1
	$IP rule add from $NET2 table T2

	#Set routing for LAN
	$IP route add $SUB3 dev $DEV3 table T1
	$IP route add $SUB2 dev $DEV2 table T1
	$IP route add 127.0.0.0/8 dev lo table T1
	$IP route add $SUB4 dev $DEV4 table T2
	$IP route add $SUB1 dev $DEV1 table T2
	$IP route add 127.0.0.0/8 dev lo table T2

	# Load balancing
	$IP route replace default equalize \
		nexthop via $GATEWAY1 dev $DEV1 \
		nexthop via $GATEWAY2 dev $DEV2

	#route add -net $NETMASK1 10.0.0.0 gw $GATEWAY1
	#route add -net $NETMASK2 172.16.0.0 gw $GATEWAY2
	#route del default gw $GATEWAY1
	#Flush routing cache
	$IP route flush cache

	#Load balancing
        #$IP route replace default equalize \
      	#  nexthop via $MULTIROUTE_EXT_ROUTER1 dev $MULTIROUTE_EXT_IF1 \
      	#  nexthop via $MULTIROUTE_EXT_ROUTER2 dev $MULTIROUTE_EXT_IF2
        #$IP route add default nexthop via $GATEWAY1 dev $DEV1 #untuk load balancing 
        #$IP route add nexthop via $GATEWAY2 dev $DEV2 #untuk load balancing
	#$IPTABLES -t nat -A POSTROUTING -s $LAN1 -o $DEV1 -j SNAT --to $GATEWAY1
	#$IPTABLES -t nat -A POSTROUTING -s $LAN2 -o $DEV2 -j SNAT --to $GATEWAY2
	#$IPTABLES -t nat -A POSTROUTING -o eth0 -j MASQUERADE
	#$IPTABLES -t nat -A POSTROUTING -o eth1 -j MASQUERADE
	#$IPTABLES -A FORWARD -i eth0 -o eth2 -m state --state RELATED,ESTABLISHED -j ACCEPT
	#$IPTABLES -A FORWARD -i eth0 -o eth3 -m state --state RELATED,ESTABLISHED -j ACCEPT
	#$IPTABLES -A FORWARD -i eth2 -o eth0 -j ACCEPT
	#$IPTABLES -A FORWARD -i eth3 -o eth1 -j ACCEPT
	echo "$NAME"
	;;
  stop)
	echo "Menghentikan $DESC1 $NAME ... "
	$IP route flush all
	$IFCONFIG $NET1 down
	$IFCONFIG $NET2 down
	$IFCONFIG $LAN1 down
	$IFCONFIG $LAN2 down
	$NETWORK restart
	echo "Default routing table restored"
	;;
  *)
	N=/etc/init.d/splitgateway
	echo "Cara Guna: $N {start|stop}" >&2
	exit 1
	;;
esac

exit 0