[Solved]WireGuard Site to site : I need to wake up

[freegate]

Hello everyone,

 I configured two opnsense sites with Wireguard with separate LAN addresses 192.168.0.0/24 (site A) and 192.168.10.0/24 (site B).

It seems to work fine.

It seems to be working correctly.

However, machines at site B are having trouble connecting to site A in the morning. They can't ping machines from site A, until a machine from site A pings a machine from site B.

And every morning, it does the same thing again. It happens that for 3 days the problem disappears then returns randomly.

It seems that it is necessary to wake up the network, because once this operation is done, everything works fine until the next day.

I can't understand the origin of the problem.

Thanks for your help.

[freegate]

I found it 

the keep alive function was not configured between the two sites.