Its not NetworkManager.
According to the NetworkManager.conf manpage the no-auto-default has
nothing to do with it.
Doing a Google search for that specific MAC address aa:00:04:00:0a:04
tells a different story.
http://www.fantaghost.com/2010/06/eth0-mac-address-fixed-on-
aa0004000a04/
Apparentl
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: network-manager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/878188
Titl
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https://bugs.launchpad.net/bugs/878188
Title:
Network Manager assigns incorrect MAC address to eth devices
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