[HowTo] reassign internet connection to the containers after connection drop

[Bazzu85]

Hi,
I'm pretty new to docker container but so far I'm understanding what I'm doing (I thing)
I have a docker compose with you openvpn-client and 2 other containers depending on his network.
I'm trying to figure out if and how the killswitch works but openvpn doesn't have a "disconnect" command so I tried to "kill" the network adapter with ifconfig tun0 down. first question: is this a valid method to test it?
Doing the ifconfig tun0 down and trying to do a google ping in a dependant container the connection is ko (good).

At this point how to restore the connection? are there something that restore it under the hood or I have to restart the entire compose?
thx for your time