Ah - I have now sorted the interface problem.

I run the code I listed earlier, but it sites at the command line
saying "listening" without every dumping anything to screen.

/sbin/ip maddr now shows:

eth1
        link  01:00:5e:00:00:04
        link  33:33:ff:7a:7e:4e
        link  01:00:5e:00:00:fb
        link  01:00:5e:00:00:01
        link  33:33:00:00:00:01
        inet  224.0.0.4
        inet  224.0.0.251
        inet  224.0.0.1
        inet6 ff02::1:ff7a:7e4e
        inet6 ff02::1


And this is the same intterface on which I would expect to see the
multicast udp packets.




On Wed, Mar 10, 2010 at 1:28 PM, Itamar Turner-Trauring
<ita...@itamarst.org> wrote:
> On Wed, 2010-03-10 at 10:35 +0000, Ben Barker wrote:
>
>> I have been looking at the examples here:
>>
>> http://code.activestate.com/recipes/425975-simple-udp-multicast-client-server-using-twisted/
>>
>> But I seem to have trouble getting them to receive anything at all.
>
> Did you do the joinGroup()? One of the examples omits it, which means it
> won't receive multicast.
>
>
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