On Ubuntu, using network-manager, I am able to acces my local LAN while at the same time using a VPN to access internet.
On android 4.4.4, I am using the app of my VPN provider (PIA), and there is no route to the local LAN when the VPN connexion is active. The official openVPN app seems to behave the same way, although I don't recall clearly my test when using it.
Using a non rooted android, possibly reverting back to openVPN app, will I be able to cast to my chromecast while using my VPN ? how ?