Site-to-Site Split Tunnel accessible from both sides

Hi dear Forum

I want to create a tunnel from my official-office (SiteA) to my homeoffice (SiteB). Both are connected via Cable. Office 75/10 mbit and home-office 125/12,5 mbit. All external traffic (Internet) should be accessible without tunneling, direct through the respective modem (Split tunnel?). Internal traffic should be possible in both directions. The tunnel should connect automatically after disconnections.

When on the road i want to be able to connect to both sites via...

Site-to-Site Split Tunnel accessible from both sides