Hi everyone - maybe someone has seen this?
Our VMware guests from different VM servers cannot communicate. The guests can communicate with everything else (physical servers in and out of the same VLAN, internet, etc).The guests are in the same VLAN show the correct ARP entries.
The guests can communicate with other guests on the same vSwitch on the same VMserver - but not with different VMserver's.
The guests can communicate with other guests on different VMServers on different VLANs.
This happens with Windows and Linux guests. The Windows guests do not have the Windows firewall on. The guests are running on ESX 3i on HP Servers and the core network switch is an HP 5400. The core switch (which is responsible for VLAN routing) can communicate with every guest.
If anyone could suggest something to try I would give it a try.