#!/bin/bash

iniciar(){
/etc/init.d/network-manager stop
iwconfig wlan0 mode ad-hoc
iwconfig wlan0 essid Rede_3G
iwconfig wlan0 key restricted XXXXXXXXXX
ifconfig wlan0 192.168.1.XX netmask 255.255.255.0
/sbin/modprobe ip_nat_ftp
echo 1 > /proc/sys/net/ipv4/ip_forward
/etc/init.d/dhcp3-server start
/sbin/iptables -t nat -F
/sbin/iptables -t nat -A POSTROUTING -s 192.168.1.0/255.255.255.0 -o ppp0 -j MASQUERADE
}

parar(){
/etc/init.d/dhcp3-server stop
/sbin/iptables -t nat -F
/etc/init.d/network-manager start
}

case "$1" in
"start") iniciar ;;
"stop") parar ;;
"restart") parar; iniciar ;;
*) echo "Use os parâmetros start ou stop"
esac