#!/bin/bash
A=0
IP4=$(/sbin/iptables -L -x -v | grep -e ^Chain | sed 's/.* \([0-9]*\) bytes)$/\1/' | ( while read n ; do A=$(( $A + $n )) ; done ; echo $A))

A=0
IP6=$(/sbin/ip6tables -L -x -v | grep -e ^Chain | sed 's/.* \([0-9]*\) bytes)$/\1/' | ( while read n ; do A=$(( $A + $n )) ; done ; echo $A))

echo $IP4
echo $IP6
echo 0
echo unknown