Answering my own question: The way I tried to reproduce the issue is missing setting an external gw network on the router, that's why there's no default route in the first place. Will add that and re-try in a dvr environment.
Answering my own question: The way I tried to reproduce the issue is missing setting an external gw network on the router, that's why there's no default route in the first place. Will add that and re-try in a dvr environment.