Osiris wrote:

> Hi,
> I'd like to know if there is a way to know whether the cable is connected
> to my interface. The aim is to detect it at startup so as to know if I
> need eth0 set up or not (on a laptop), in which case (if not needed) only
> the wifi card is set up.
>
> In fact the problem is that if the wifi card AND the eth0 interface are
> both set up, I cannot use the wifi card, even if the cable is not plugged
> to the eth0 interface.
>
> My route says that the default gw is wlan0, but eth0 is set first.
> Any idea ?

You could write a script to turn down one interface and bring up the other.
Another possibility, is to use profiles. You'd create a profile for each
configuration. You can then switch profiles at any time, or even at boot
up.