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Packet loss in VPN Ipsec Site 2 site

hello

I would like to know what could be causing packet loss when I try to access a server located in a branch office through VPN IPSEC site 2 site used as a backup.
The problem is when I have to turn on the VPN tunnel that is intended for backup, since when accessing the web server it takes several seconds before showing the main page, and if I do a constant ping while accessing the server I see that some packets are lost until the server page is shown and the ping responds again.
This problem does not happen when the VPN Main tunnel is active, the server response is fluid and the ping does not lose packets at any time.

What configurations or logs could I check to detect the problem?



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