How to Control the Source IP Address in ZeroMQ?

Controlling IP Source Address in ZeroMQ

ZeroMQ differs from conventional sockets in its hierarchical approach to communication. It introduces the concept of "engines" (Contexts) and "Access Points" (sockets) with predefined behavioral archetypes.

To control the source IP address for a ZeroMQ packet, you need to bind the Access Point using a fully qualified address specification:

.bind("{ tcp | pgm | epgm }://<ip>:<port#>" )

Example

Consider a machine with multiple IP addresses:

• 192.168.0.1
• 192.168.0.2

To bind an Access Point to the first IP address, use:

access_point.bind("tcp://192.168.0.1:5555")

Similarly, to bind to the second IP address:

access_point.bind("tcp://192.168.0.2:5555")

This ensures that outgoing packets from the Access Point will have the specified IP address as their source address.

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