#!/bin/bash
#
R1="\-A POSTROUTING -d ! 192.168.1.0/24"
R2="\-A POSTROUTING -d 127.0.0.1"

RES_NOT_LAN=$( iptables -t mangle -S POSTROUTING -v | grep "$R1" )
RES_LO=$( iptables -t mangle -S POSTROUTING -v | grep "$R2" )
TOTAL_NOT_LAN=$( echo "$RES_NOT_LAN" | awk '{ print $NF }')
TOTAL_LO=$( echo "$RES_LO" | awk '{ print $NF }')

TOTAL=$(( $TOTAL_NOT_LAN - $TOTAL_LO ))

echo $TOTAL