I have the same problem, the mac of my ethernet card are switching between
00:1B:FC:AB:CA:A6 and a6:ca:ab:fc:1b:00 every time I suspend my system. I made
a workarround defining both macs for eth0. editing the file:
/etc/udev/rules.d/70-persistent-net.rules
You should see something like this:
---
# This file maintains persistent names for network interfaces.
# See udev(7) for syntax.
#
# Entries are automatically added by the 75-persistent-net-generator.rules
# file; however you are also free to add your own entries.
# PCI device 0x10de:0x0057 (forcedeth)
SUBSYSTEM==net, DRIVERS==?*, ATTRS{address}==00:1b:fc:ab:ca:a6,
NAME=eth0
# PCI device 0x10de:0x0057 (forcedeth)
SUBSYSTEM==net, DRIVERS==?*, ATTRS{address}==a6:ca:ab:fc:1b:00,
NAME=eth1
---
You can see how the system are detecting two macs for same card (I have
not other one) So In order to avoid the switching I have changed the
eth1 to eth0 and seems Its working for me.
--
eth0 is rename to ethX after sleep
https://bugs.launchpad.net/bugs/205827
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