in some cases to do docker builds within a dind container I need to set mtu, how to know the right mtu value to set for a k3s cluster created with k3d

Never used that... I guess the easiest would be to pre-create a docker network with the correct MTU and then create the k3d cluster using that network. I think docker defaults to 1500? 🤔 Not sure about anything here though.

thanks @wide-garage-9465