We found that after a resume / suspend cycle the interface goes back to
work if it is put in promiscuous mode. This was found by accident while
running tcpdump to see if there was traffic going through.

This can be tested afer resume with:

1.

ifconfig eth0 promisc
activate interface in Network Manager
.... will work

2. deactivate interface in Network Manager

3.

ifconfig eth0 -promsic
activate interface in Network Manager
... will fail

Therefore, the problem can be worked around by creating
/etc/pm/power.d/10_eth0_promisc  with

----------------------------------------
#!/bin/bash

ifconfig eth0 promisc
----------------------------------------

and give this file execution permissions.

This will ensure that after resume the interface comes up in promiscuous
mode.

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https://bugs.launchpad.net/bugs/771857

Title:
  Realtek 8168B (r8169) interface not working following suspend

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