#!/bin/bash
#echo 1 > /proc/sys/net/ipv4/ip_forward

iptables -F
iptables -t nat -F

iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT

iptables -A FORWARD -p tcp --dport 80 -j REJECT
iptables -A FORWARD -p udp --dport 80 -j REJECT

iptables -t nat -A PREROUTING   -p tcp --dport 80 -j REDIRECT --to-port 3128

iptables -t nat -A POSTROUTING -j MASQUERADE

ip.sh