>> But I seem to have trouble getting them to receive anything at all. > > That's a little vague. Does "trouble" mean "it sometimes works" or > "never works"? >
Sorry - yes, it was very vague! Never works. If I run wiresahrk I can see udp packets addressed to 224.0.0.4, port 901, flying past, however when I run my python script it does not appear to ever receive anything. The scritp I am running is almost identical to an exampel I found here: http://code.activestate.com/recipes/425975-simple-udp-multicast-client- server-using-twisted/ >> >> I have managed to use tshark to display the packets : >> >> tshark -i eth0 -x -l -f udp >> > Can you post a complete example that isn't working for you? > > When your code is running, have a look "/sbin/ip maddr" to ensure the > group has been added to the socket listen filter 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 That's interesting.... eth1 is the wrong interface! In fact, it isn't connected to anything at all. eth0 is the interface that should be being used. I will try to swap them around, but presumably this is something I can specify somwhere... As I said, the code I am using is taken from the above link, but the exact listing is given below: from twisted.internet.protocol import DatagramProtocol from twisted.internet import reactor from twisted.application.internet import MulticastServer class MulticastServerUDP(DatagramProtocol): def startProtocol(self): print 'Started Listening' # Join a specific multicast group, which is the IP we will respond to self.transport.joinGroup('224.0.0.4') def datagramReceived(self, datagram, address): print "Server Received:" + repr(datagram) reactor.listenMulticast(901, MulticastServerUDP()) reactor.run() > _______________________________________________ > Twisted-Python mailing list > [email protected] > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > _______________________________________________ Twisted-Python mailing list [email protected] http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
