Round Robin iptables

rr.sh

#!/bin/bash

#FLUSH
iptables -F
iptables -t nat -F
iptables -F REGRAS_SNAT
iptables -X REGRAS_SNAT

echo 1 > /proc/sys/net/ipv4/ip_forward

iptables -t nat -I POSTROUTING -s 172.22.9.0/24 -o eth1 -j MASQUERADE

iptables -t nat -N REGRAS_SNAT
iptables -t nat -I POSTROUTING -j REGRAS_SNAT
iptables -t nat -A REGRAS_SNAT -d 172.22.9.0/24 -j RETURN

iptables -t nat -A REGRAS_SNAT -o eth1 -s 200.20.228.6/32 -p tcp --dport 25 -j SNAT --to 200.20.228.11-200.20.228.12