This is one of the ways to check and It's soo simple.
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As long as the one pinging is fast then It will likely work, If you're not satisfied with that one then find the closest server from the website. Either way Ryujin X uses this way to know if a website is vulnerable but not all websites are vulnerable due to WAF.That's not how ping works though. Merely a ping doesn't tell you if the website is vulnerable or not. It just shows you how long (in milliseconds) will the server reach its destination (your domain/website). It doesn't show if the website is vulnerable or not. This is the same ping you're using in the command prompt (of Windows OS) and terminal (of Linux and MacOS).
The farther the test server is to its destination, the higher the latency will be.
This is like traveling from Manila to Mindanao. In this illustration, Ping shows how long will be the travel from Manila to Mindanao. That's just it.
How so? Ping doesn't tell you anything. If you want to find some vulnerabilities, then you should start with an nmap command to find possible open/exposed ports from the website.Either way Ryujin X uses this way to know if a website is vulnerable but not all websites are vulnerable due to WAF.
It's possible which I will not explain further. Also I think your misunderstanding the word "vulnerable" it does not necessarily means like the literal "vulnerable" (Exploits stuff like that) but rather It's "vulnerable".How so? Ping doesn't tell you anything. If you want to find some vulnerabilities, then you should start with an nmap command to find possible open/exposed ports from the website.