I want to show captcha for all visitors without search engine visitors. Already I made a firewall rule for IP address (Expression - (ip.src ne 192.0.0.0 / my IP)), where all visitors (search engine visitors, referral visitors, social visitors, direct visitors) have to solve a captcha to enter my website.
But I want the visitors that only come from search engines (like Google, Bing, DuckDuckGo), they don’t have to solve any captcha.
How do I do that?
Any firewall rule for this?