VPN Monitoring

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Hello;

I have this issue in our client company where they have 2 ISPs.

Lets call it: ISP 1 and ISP2

When using ISP1. the VPN configuration is working well. When using ISP2. the VPN traffic is having intermittent connection.

Is there any possible way to monitor the VPN traffic on what is happening on ISP2? Because I don't know which side will work to solve it whether its ISP or the Client-IT.

Thank you all;