forward udp broadcast packets on same subnet /interface with diff source

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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



		
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