Hi all,
Sitting next to Luca in Debconf, I wanted to automate the DNS
forwarding for the Freerunner when it runs on USB networking. So we
merged our scripts into one, and here's the result. I stored in in
/usr/local/sbin/freerunner-net, and symlinked it into
/etc/network/if-up.d and /etc/network/if-down.d. And now it works :-)
I'd store it in the wiki, but I don't have my identifiers at hand.
Feel free to use, enhance and share.
Roland.
--
Roland Mas
...sur un portable, quelque part dans le monde...
...on a laptop, somewhere in the world...
#! /bin/sh
if [ "$IFACE" != usb0 ] ; then
exit 0
fi
case "$MODE" in
start)
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -A POSTROUTING -t nat -o eth0 -j MASQUERADE
iptables -A POSTROUTING -t nat -o eth1 -j MASQUERADE
iptables -A FORWARD -i usb0 -j ACCEPT
iptables -A FORWARD -o usb0 -j ACCEPT
iptables -t nat -s 192.168.0.202 -A PREROUTING -j DNAT \
-d 192.168.0.200 -p udp --dport 53 \
--to-destination $(grep -m 1 nameserver /etc/resolv.conf | cut -d ' ' -f 2)
iptables -t nat -s 192.168.0.202 -A PREROUTING -j DNAT \
-d 192.168.0.200 -p tcp --dport 53 \
--to-destination $(grep -m 1 nameserver /etc/resolv.conf | cut -d ' ' -f 2)
;;
stop)
echo 0 > /proc/sys/net/ipv4/ip_forward
iptables -D POSTROUTING -t nat -o eth0 -j MASQUERADE
iptables -D POSTROUTING -t nat -o eth1 -j MASQUERADE
iptables -D FORWARD -i usb0 -j ACCEPT
iptables -D FORWARD -o usb0 -j ACCEPT
iptables -t nat -s 192.168.0.202 -D PREROUTING -j DNAT \
-d 192.168.0.200 -p udp --dport 53 \
--to-destination $(grep -m 1 nameserver /etc/resolv.conf | cut -d ' ' -f 2)
iptables -t nat -s 192.168.0.202 -D PREROUTING -j DNAT \
-d 192.168.0.200 -p tcp --dport 53 \
--to-destination $(grep -m 1 nameserver /etc/resolv.conf | cut -d ' ' -f 2)
;;
*)
echo "Usage: $0 [up|down]"
exit 1
;;
esac
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