How to remotely connect to a wi-fi network without having access to a wifi router?

Question

VPN

The bottom line is this: there is a local area network of office A. I have access to this network only in the wi-fi coverage area. Having connected to the wireless network of office A (having received an internal ip), it becomes possible to access the remote server of office B via RDP.
There is no access to device administration in any of these networks.

Is it possible to remotely connect to the wifi network of office A in order to get access to rdp network B?

The simplest thing that comes to mind is to physically place, for example, a laptop in the area of ​​\u200b\u200bwifi network A. Connect to this beech through a teamviewer and then run rdp on this beech.
But I would like to find a more competent solution, it may be possible to use some kind of autonomous mobile router + vpn.

Answer 1

A smart solution is to ask the system administrator to set up VPN access for you.
The rest of the solutions are crutches, the option with the team weaver is working
Well, or "expand" the wifi network using wifi bridges ...

Answer 2

Take 2 routers, Mikrotik Hap-Lite for example. 1st place at home and set up a VPN server. You need a white static IP. Place the 2nd one in the office and connect it to wifi, then set up a VPN client on it to your home.
Next, register routes to your RDP server on your home router and now you have round-the-clock access to the office. The best part is that you don't have to do anything all the time. Open RDP, write IP RDP and log in.