How to do dynamic port forwarding?

Question

Network administration

Greetings.
There is a network based on Keenetic Extra
A smartphone with the address 192.168.1.10 is connected via Wi-Fi The
smartphone is used as an SMS gateway using https://play.google.com/store/apps/details?id=pier... The
SMS gateway is linked to port 5554, port forwarding is configured in the router Now the smartphone leaves the network and connects through its provider to the Keenetic
Extra VPN server and receives the address for the VPN client 172.20.
IP which is connected at the moment?

Answer 1

Is it possible on the router to reserve the address that is allocated to the client (specifically this mobile)?
If there is, then it’s better that way, otherwise dancing with a tambourine.