Instant gateway
I've written a script that will turn my laptop into an instant gateway if I have a connection on the lan port. It uses dnsmasq for dns forwarding and DHCP while iptables provides the forwarding/masquerading for ip.
I use this for providing my Nokia 770 a link when I only have a wired connection, or when I want to ssh into my Nokia 770.
#!/bin/sh
#
# Requires: dnsmasq, iptables debian packages
function start () {
ifdown --force eth1
ifconfig eth1 10.2.5.2 netmask 255.255.255.0
iwconfig eth1 mode ad-hoc
iwconfig eth1 essid maemo
/etc/acpi/ibm-wireless.sh on
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
/etc/init.d/dnsmasq start
}
function stop () {
/etc/acpi/ibm-wireless.sh off
ifdown --force eth1
iptables -F
iptables -t nat -F
iptables -t mangle -F
echo 0 > /proc/sys/net/ipv4/ip_forward
/etc/init.d/dnsmasq stop
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
*)
echo "Usage: maemo {start|stop|restart}" >&2
exit 1
;;
esac
exit 0
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