How can I setup vSphere so that VLAN tags are not stripped at the vSwitch?

networking vmware-vsphere vlan vmware-esx

You need to check this VMware KB about VM VLAN Tagging Mode. This explains what to do on ESX 3.X but applies to 4 and 5 too.

Basically you need to enable trunk mode on the vSwitch by using VLAN ID 4095 to let your guests do the tagging.

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