Comment 2 for bug 659872

Actually, there is a workaround, and that would be to use another 127.x.y.z address just for the aliases. Could you try setting up your aliases with say, 127.0.0.5 and letting us know whether it works fine for you (and doesn't get overwritten by NM).

This seems like a very valid use case though, and perhaps NetworkManager should be told to add hostname aliases as specified in a connection's settings. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.