#!/bin/sh

#$1 == Net device
#$4 == Assigned VPN IP
#$5 == VPN Gateway IP


ip route flush table vpn
ip route add default dev $1 via $5 src $4 table vpn
ip rule add from all fwmark 1 table vpn

iptables -t mangle -A INPUT -i $1 -j MARK --set-mark 1
iptables -t mangle -A INPUT -i $1 -j CONNMARK --save-mark

iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark

iptables -t nat -A POSTROUTING -o $1 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward

ip route flush cache