Unusual traffic from your computer network

Hi,

First of all i don't know the thread is in correct session .

Users are often getting the message from google and they are forced to enter captcha "Unusual traffic from your computer network",

When i capture the traffic from the moment user hit google.com , the software captured around 500 frames in both directions .

So the questions from fortigate side ,how do i check which source is sending unwanted traffic to google .

and how to limit if they are sending huge amount of packets .

Please help

Thanks

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