#/bin/sh

iptables -t nat -A POSTROUTING -s 192.168.0.x/32 -j SNAT --to-source x.x.x.x

iptables -t nat -A POSTROUTING -d 192.168.0.x -s 192.168.0.0/24 -p tcp --dport 10002 -j SNAT --to 192.168.0.1 
iptables -t nat -A POSTROUTING -d 192.168.0.x -s 192.168.0.0/24 -p udp --dport 10002 -j SNAT --to 192.168.0.1 

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 10002 -j DNAT --to 192.168.0.x:10002 
iptables -t nat -A PREROUTING -i eth0 -p udp --dport 10002 -j DNAT --to 192.168.0.x:10002 

iptables -t nat -A PREROUTING -d x.x.x.x -p tcp --dport 10002 -i eth1 -j DNAT --to-destination 192.168.0.x:10002 
iptables -t nat -A PREROUTING -d x.x.x.x -p udp --dport 10002 -i eth1 -j DNAT --to-destination 192.168.0.x:10002 


## x.x.x.x = ip real 
## 192.168.0.1 = ip-ul interfetei dinspre retea 
## eth0 = interfata dinspre retea 
## 10002 = portul forwardat 
##192.168.0.x = ip-ul calc retea 
## La odc se seteaza ip=x.x.x.x si port 10002