I have four Windows Server 2012 servers hosted on ESXi 5.5.
The first one is the firewall box with two network adapters. One with an external connection to the internet, that is shares its connection with the second internal network adapter with no external connection.
The other three servers are only on the internal network adapter. The other three servers have internet through the firewall box and can all ping externally like google.com but firewall box cant ping any of the other servers and none of the servers can ping the firewall box or each other.
Mapper I/O (LLTDIO) driver and Responder (RSPNDR) driver under Link-Layer Topology Discovery in the Local Group Policy Editor are enabled:
And ICMP is set to exempt in the Windows Firewall with Advanced Security on Local Computer IPsec Settings: