This script is help to set the NAT communicating with eth0(WAN) and eth1(LAN GW)

Example :
eth0: 203.123.123.123
eth1: 192.168.0.1

[root@~]# vi /root/natroute.sh
[root@~]# chmod 755 /root/natroute.sh 

## This script is help to set the NAT 
## communicating with eth0(WAN) and eth1(LAN GW)

## Set LAN subnet 192.168.0.0 route to gateway eth1 
route add -host 255.255.255.255 dev eth1
route add -net 192.168.0.0 netmask 255.255.255.0 gw 192.168.0.1

## NAT Routing communiucate with eth
echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -s 192.168.0.0/24 -j MASQUERADE
PS: You can add above code or "natroute.sh" in /etc/rc.local for automatic start NAT function after reboot.


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