Traffic wrotePlease see the Forum rules (top of page)
I saw them.
I have started with HOWTO, but I cannot find there my case.
Traffic wroteWhat do you need the VPS for ?
That is only machine with public IP that I can manage.
Traffic wroteBoth your local LANs use the extremely common subnet address 192.168.1.0/24 this will create a routing conflict ..
No, there won't be a conflict. The first one LAN uses subnet 192.168.1.0/24, the second one 10.1.1.0/24. With the red text on the picture I underline what IP I expect to get on 'Client' assigned by 'Router B'.
Traffic wroteDid you miss that ?
No, I didn't.