Because i am not used with this mailing list, the message that follows was sent before the ip_forward thingy, but arrived to tom only. And one thing, you can always change routes for all sort of packets, like DNAT of packets hich aparently rached theyr destination ---------- Forwarded message ---------- From: George Alexandru Dragoi <waruiinu@xxxxxxxxx> Date: Wed, 14 Jul 2004 07:31:47 +0200 Subject: Re: forward udp broadcast packets on same subnet /interface with diff source To: Tom Thumb <tomthumb888@xxxxxxxxx> Take a loot here: http://www.netfilter.org/patch-o-matic/pom-extra.html#pom-extra-ROUTE My ideea (not tested) si to do an iptables -t mangle -A PREROUTING -p udp -d 192.168.1.255 -s 192.168.1.6 -j ROUTE --gw 192.168.1.5 --continue iptables -t mangle -A PREROUTING -p udp -d 192.168.1.255 -s 192.168.1.6 -j MARK --set-mark 0x1 then: iptables -t nat -A POSTROUTING -m mark --mark 0x1 -j SNAT --to 192.168.1.7 On Tue, 13 Jul 2004 22:02:47 -0700 (PDT), Tom Thumb <tomthumb888@xxxxxxxxx> wrote: > Hi, > > Can I use iptables to forward UDP broadcast packets on > the same subnet and interface but just change the > source IP? > > That is, the forwarding machine is 192.168.1.5, with > mask 255.255.255.0 and has a single NIC. > > A machine with IP 192.168.1.6 with the same mask sends > a UDP broadcast to 192.168.1.255. > > The forwarding machine receives this packet. Can it be > configured to resend it out on the same interface that > it received it on (its only interface) and just change > the source IP to be a 3rd address, like 192.168.1.7, > but also as a UDP broadcast to 192.168.1.255? > > Is there any way to do this without adding a physical > NIC? Do I need to add a "virtual" NIC to do it? How? > > Thanks > > > __________________________________ > Do you Yahoo!? > Yahoo! Mail Address AutoComplete - You start. We finish. > http://promotions.yahoo.com/new_mail > >
