Hello,
following the IPSEC example on your site I succeeded to make work a VPN between two RUT950: a laptop between on RUT950 can ping the laptop connected to the remote RUT950. In this scenario a had 2 wired public IPs; no need for further settings (like static routes).
If one of the 2 sites become "cellular" (so I inserted a SIM) the VPN goes in "established" but the two laptop are not pinging each other.
What else is needed in this case?
Thank you