Why do i have to accept 0.0.0.0/0 when i want that ips behind Router B can access the internet trough Tunnel B<>A <>Internet ?! if i just make separate IP Adresses for each that should have access to the internet that wont work…
Your question is confusing because I have no idea
A. what your network diagram looks like
B. what your c onfig looks like.
Suggesting start a new/own thread.