selecting connection clobbers default connection for all interfaces

[dronus]

Affecting Ubuntu 12.04.

If more then one wired interface is available (eg. more then one ethernet port, or virtual ports as made by USB ethernet devices), selecting a connection on one device is setting the default for ALL wired interfaces.

For example:

I connect my mobile phone to provide internet via USB. I connect another PC to eth0 to provide a local network. The PC needs a internet sharing connection providing a DHCP server. The mobile phone needs a normal dhcp client connection.

When unpugging either the phone or other PC, and replug it again, the last manual established connection is selected for this interface. This is arkward.

So I have to select the correct connection everytime again, as the automatic connection assigned almost never fits both interfaces.