How can ping virtual machine on VMware Server external network?

In the Vmware infrastructure products you can can be crazy from the outside through their individual networks connections, which is a good thing... lol

How this is possible on VMware Server when guests use the VMnet8 network that uses NAT?

In many scenarios, the use of bypass is prohibited due to the policy defined at the level of the external switch, but it is still necessary for the basic functionality of ping. Otherwise, how they would be able to know if a virtual machine is actually up to who answered the questionnaire on the network without entering actual connections to such hosts?

You're right - that's how NAT works (whether via a service such as the VMware NAT service software or a hardware router/firewall NAT).  All computers behind the NAT server are hidden from the outside world (unless you map specific ports to the specific IP address of a computer)... they are so NOT to pings from the outside.

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