Router

simpler router

wlan0 ist die schnittstelle die ins internet geht ip: 1.2.3.4 eth0 geht ins intranet

ifconfig eth0 down
ifconfig wlan0 down
dhclient wlan0
#route add -net default gw 1.2.3.4 dev wlan0
ifconfig eth0 192.168.1.1 up
iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward

static netzwerk router

router.sh

ifconfig eth0 192.168.1.50
ifconfig wwan0 192.168.0.50
route add -net default gw 192.168.0.1
iptables -t nat -A POSTROUTING -o wwan0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward

automatisches starten

startet automatisch wenn kabel eingesteckt wird (ruft einfach nur router.sh auf, sollte noch optimiert werden)

apt-get install netplug

/etc/netplug/netplugd.conf

eth0
wwan0

/etc/netplug/netplug

PATH=/usr/bin:/bin:/usr/sbin:/sbin
export PATH

dev="$1"
action="$2"

case "$action" in
in)
echo "netplug $dev $action" >> /var/log/netplug.log
/home/pi/router.sh >> /var/log/netplug.log
    if [ -x /sbin/ifup ]; then
        exec /sbin/ifup "$dev"
    else
        echo "Please teach me how to plug in an interface!" 1>&2
        exit 1
    fi
    ;;
out)
echo "netplug $dev $action" >> /var/log/netplug.log
    if [ -x /sbin/ifdown ]; then
        # At least on Fedora Core 1, the call to ip addr flush infloops
        # /sbin/ifdown $dev && exec /sbin/ip addr flush $dev
        exec /sbin/ifdown "$dev"
    else
        echo "Please teach me how to unplug an interface!" 1>&2
        exit 1
    fi
    ;;
probe)
echo "netplug $dev $action" >> /var/log/netplug.log

    exec /sbin/ip link set "$dev" up >/dev/null 2>&1
    ;;
*)
echo "netplug $dev $action" >> /var/log/netplug.log
    echo "I have been called with a funny action of '%s'!" 1>&2
    exit 1
    ;;
esac

http://superuser.com/questions/332968/how-to-configure-eth0-to-retry-dhclient-when-unplugged-and-replugged