dhcpcd-discuss

Hi Martin

On 04/11/2020 16:10, Martin Bengsch wrote:
> Hello everybody,
> is it possible to use dhcpcd to put down an ethernet interface when it is unplugged and bring it back online, when it is connected. With "up" and "down" I mean the stated that result for example from "sudo ip link set eth0 down" and "sudo ip link set eth0 up".
> I tried using "nolink" and "noup" for the interface, however, it didn't helped.
>
> Does someone know how to achieve this behaviour? Thank you very much! :)

Unsure why you would want that behaviour, but with dhcpcd many things are 
possible :)

Please note that putting an interface down may affect the abiltity of the 
reported carrier state to function.

Anyway, you can put this in /etc/dhcpcd.exit-hook

case "$reason" in
CARRIER)	ip link set $interface up;;
NOCARRIER)	ip link set $interface down;;
esac

Roy