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  • wow! I had wished for such a comprehensive answer, but didn't dare to expect it. Thank you very much! Commented Jul 20, 2018 at 9:04
  • By "...you must always mount /sys" does the "you" refer to the (inquiring) process trying to access /sys/class/net -- and not the process creating the network namespace, correct? Commented Jul 20, 2018 at 9:07
  • @TheDiveO I mean any process in the network namespace of the inquiring process (including this process itself). That seems to be enough. Commented Jul 20, 2018 at 9:51
  • @sourcejedi sure, I will change references to the specific commit. Commented Jul 20, 2018 at 9:52