What is the best configuration of P2P ?

What are the best settings for configuring a P2P connection?

Hi every body;)
I hope you are very well.
I own two pieces of the device mentioned below:

RouterBOARD LHG 5nD

With its latest software update, version:

mipsbe-6.46.2

And I made a P2P connection between them,
Where I made the first Master and the second Slave,
For the purpose of withdrawing the internet from the service provider,
Then it is transmitted via the TP-Link home router type:

TP-Link Touch P5

You have adjusted their settings on this basis above.
So, let me ask you about the following:

What are the best settings for configuring a P2P connection?

With one being a Master and a Slave,
Then the internet is transmitted via a TP-Link home router.

I hope everyone helps me to do this as fully as possible.
thank you very much...

Note: The backup files for Master and Slave devices are attached below,
So I ask you to review it and make adjustments to it.
Or notify me of any adjustments that need to be made.

Note that:
1- The results of the process of ( Ping ) examination of sites
according to the current settings, give the next result ( TimeOut ) !!?

2- I can not automatically updated that devices from the inside it by ( Check For Updates ) !!?
and this error has shown: ( ERROR: bad HTTP response ) !!?
or this error has shown: ( ERROR: could not resolve dns name ) !!?
master fullbackup.rsc (2.71 KB)
slave fullbackup.rsc (2.49 KB)
Regards.

Feras Temimi