Network and IPC namespacing are just two different ways of communicating using namespaces. I can't imagine that the overhead of either is significant. I can se

Network and IPC namespacing are just two different ways of communicating using namespaces. I can't imagine that the overhead of either is significant. I can see, from a design perspective, that network namespacing is likely more scalable. Network addresses can be local or WAN while unix sockets would tie you to a single node. That implies a very different and slightly more rigid scaling strategy with IPC based communication.