Q: transform unicast to multicast with iptables?

Antony Stone Antony@Soft-Solutions.co.uk
Wed, 2 Oct 2002 08:39:43 +0100


On Wednesday 02 October 2002 8:16 am, Karasik, Vitaly wrote:

> Is is possible to transform unicast UDP stream to multicast output with
> iptables NAT?

I don't see why not, so long as the original packets are not being created on 
the netfilter machine itself.

Just put a rule in the PREROUTING chain like so:

iptables -A PREROUTING -t nat -d a.b.c.d -j DNAT --to w.x.y.z

where a.b.c.d is the unicast address your application was sending to, and 
w.x.y.z is the mutlicast address you want to broadcast to.

Antony.

-- 

There are two possible outcomes.

If the result confirms the hypothesis, then you've made a measurement.
If the result is contrary to the hypothesis, then you've made a discovery.

 - Enrico Fermi