Comment 4 for bug 92567

And here is the temporary fix:

1. Disable network connections via the panel icon of the network manager otherwise you will run into problems
2.
sudo ifdown eth1 && sudo ifdown eth0

3.
sudo ifup eth1 && sudo ifup eth0

The normal network settings will then be read out from /etc/network/interfaces.

It seems to work full speed, haven't tested it extensively tho.