Ping (check connection) in System Tree

[Illia]

How it works? What happens on the server side? What does the server ask for to determine if the system is available or not? Is this a normal ping, or is the server requesting something else from the target machine? How does this button work internally?

[cdinet]

KB88001 should answer that.

[Illia]

Sorry, but no. I want to know what the ePO server is requesting from the target machine to determine if it is available or not. Is he just doing a primitive ping, key exchange, or something else? how does ping work?

[cdinet]

This is how ping works.

https://en.wikipedia.org/wiki/Ping_(networking_utility)

Ping operates by means of Internet Control Message Protocol (ICMP) packets. Pinging involves sending an ICMP echo request to the target host and waiting for an ICMP echo reply. The program reports errors, packet loss, and a statistical summary of the results, typically including the minimum, maximum, the mean round-trip times, and standard deviation of the mean.

epo uses Java InetAddress.isReachable

What is isReachable () method in Java?

Methods of InetAddress Class

Method	Action Performed
isReachable()	Specify the network interface to be used while checking for reachability and the ttl parameter specifies the number of hops the echo packet makes before exiting the network.

[Illia]

what does the server require from the target machine to determine its availability? he just sends her packets and if they reach the machine is available?

[Illia]

does mine ask for a domain name, or something else?

[cdinet]

No requests for anything like that are involved in a ping.  It sends an echo requests and gets an echo response - are you there?  yes, I am here.  That's it.  If no response is received, then the ping returns unreachable.