Tips & Tricks

How do I do local multicast?

Using IP multicast on a local machine is not a good idea. OS stacks that forward multicast packets on a local machine tend to be inefficient and cause a lot of packets to be dropped. Thus, to implement a mutlicast server publishing data to both network clients and local clients, you should use combination of pgm and ipc transports:

void *s = zmq_socket (ctx, ZMQ_PUB);
zmq_bind (s, "pgm://eth1;239.192.1.1:5555");
zmq_bind (s, "icp:///tmp/mypub");

Afterwards you can connect the local clients via ipc and network clients via pgm.

How do I pass my multicast traffic through the public Internet?

Public Internet is for most …