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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