Question about robustness of auto-tunneling feature during network change

[ronandalton]

Hello, I was wondering about how dependable the auto-tunnel feature is, in terms of always applying the correct tunnel configuration, even during network changeovers.

Does the tunnel configuration apply after a network change is detected, or is there some mechanism whereby all traffic is blocked while a network change is taking place? Maybe Android allows apps to receive a callback before a network change, or provides some way for a socket to be bound to a particular network?

Interested to know your thoughts on this or if it's been tested. It's okay if the auto-tunneling feature is best effort because of limitations in Android, but I thought knowing it's guarantees or limitations would be helpful for someone looking to use this feature.

Thanks!