ipforward cmd

gistfile1.txt

#!/bin/bash

# broadcasting interface
BROADCAST="wlan0"

# receiving interface broadcast is connected to
RECEIVE="eth0"

if [[ $1 == "-0" || $1 == "--start" ]]
 then
 ## start hostapd
 echo "Starting hostapd"
 echo "    You can view the log at /var/log/hostapd.log"

 # launch hostapd daemon
 hostapd -d /etc/hostapd/hostapd.conf > /var/log/hostapd.log &

 ## start dhcp server
 echo "Starting dnsmasq"

 # set IP address
 ifconfig $BROADCAST 192.168.0.1
 sleep 2

 # launch dhcpd3 daemon
 # echo "INTERFACES=$BROADCAST" > /etc/default/dhcp
 # dhcpd3 $BROADCAST &
 dnsmasq

elif [[ $1 == "-1" || $1 == "--stop" ]]
 then
 # send signal 2 to hostapd and dhcpd3
 killall -2 hostapd  dnsmasq

elif [[ $1 == "-2" || $1 == "--ics" ]]
 then
 # create iptables rules
 iptables -A FORWARD -i $RECEIVE -o $BROADCAST -s 192.168.0.1/24 -m conntrack --ctstate NEW -j ACCEPT
 iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
 iptables -A POSTROUTING -t nat -j MASQUERADE

 # set kernel variable(s)
 echo 1 > /proc/sys/net/ipv4/conf/all/forwarding

 # edit kernel configuration
 cp /etc/sysctl.conf /etc/sysctl.conf.ap_ctl
 echo "net.ipv4.conf.default.forwarding=1" >> /etc/sysctl.conf
 echo "net.ipv4.conf.all.forwarding=1" >> /etc/sysctl.conf

 # restart networking
 /etc/init.d/networking restart

elif [[ $1 == "-3" || $1 == "--noics" ]]
 then
 # remove iptables rules
 iptables -D FORWARD 1
 iptables -D FORWARD 1

 # set kernel variable(s)
 echo 0 > /proc/sys/net/ipv4/conf/all/forwarding

 # revert kernel configuration
 mv -i /etc/sysctl.conf.ap_ctl /etc/sysctl.conf

 # restart networking
 /etc/init.d/networking restart

else
 echo $0
 echo "A tool to manage hostapd and dhcpd3"
 echo "Usage:"
 echo "    -0 --start    Start hostapd and dhcpd3"
 echo "    -1 --stop    Stop hostapd and dhcpd3 with signal 2"
 echo "    -2 --ics    Activate internet connection sharing"
 echo "            between specified interfaces"
 echo "    -3 --noics    Undo internet connection sharing settings"
fi

exit 0