iptables='/usr/local/sbin/iptables'
$iptables -F
#$iptables -N POSTROUTING
$iptables -t nat -A POSTROUTING -s 192.168.4.0/24 -p tcp --dport 23 -j SNAT --to 194.44.79.114
$iptables -t nat -A POSTROUTING -s 192.168.15.0/24 -p tcp --dport 21 -j SNAT --to 194.44.79.114
#$iptables -A POSTROUTING -s 192.168.15.0/24 -p tcp --dport 21 -j SNAT --to 194.44.79.114
#$iptables -A POSTROUTING -s 192.168.15.0/24 -p tcp --dport 20 -j SNAT --to 194.44.79.114