Task #5345
open
Add or document methodology for natively creating sockets in node network namespaces
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Description
There is currently no obvious method of creating Python sockets native to a node's network namespace from the main application; either it does not exist or is extremely poorly documented. This leads to awkward coding patterns and is one of the most obvious blockers for the usage of Python-NDN applications on nodes without needing to manage additional processes. We either need to document and potentially add helper methods for this if the functionality exists already, or otherwise attempt to implement this. For the latter, we should likely try and merge this to Mininet directly.
Updated by Junxiao Shi 3 months ago
Mininet's interaction with network namespaces is through mnexec.c.
It supports starting a new process in a new/existing network namespace, but does not directly support passing back a network namespace.
You could use it to invoke a program that creates a socket of requested type in the target netns and then pass it back via Unix socket ancillary data.
ns-3 has a pair of sender and receiver for your reference.