Hi,
looking for the answer to this problem, I searched the web and this
mailing list, but I still couldn't find a definitive answer to the
question that I have.
In my setup I need to a UDP packet sent to the external IP of my router
to trigger a broadcast UDP packet on the local network and relay back
the answers to this packet.
It looks like this should do the trick:
iptables -t nat -I PREROUTING -i ppp0 -p udp --dport 3333 -j DNAT --to 192.168.0.255
Of course, as I write this e-mail, this does not work. I can see the
packets entering the INPUT chain, but I see no packets on the OUTPUT
chain. I speculate that this is because braodcast addresses are not
routable and thus the packet gets lost somewhere.
Is there any method to solve this with netfilter or do I need to write a
bi-directional UDP proxy in userspace?
Thanks
Detlev
--
(3) With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly overhead.
-- The Twelve Networking Truths (RFC 1925)
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