ESXI-06-000064 - All port groups must not be configured to VLAN 4095 unless Virtual Guest Tagging (VGT) is required.

Information

When a port group is set to VLAN 4095, this activates VGT mode. In this mode, the vSwitch passes all network frames to the guest VM without modifying the VLAN tags, leaving it up to the guest to deal with them. VLAN 4095 should be used only if the guest has been specifically configured to manage VLAN tags itself. If VGT is enabled inappropriately, it might cause denial-of-service or allow a guest VM to interact with traffic on an unauthorized VLAN.

Solution

From the vSphere Client select the ESXi Host and go to Configuration >> Networking >> Select properties on the virtual switch >> Select the port group and click Edit. Change the VLAN ID to not be 4095 and click OK.

or

From a PowerCLI command prompt while connected to the ESXi host run the following command:

Get-VirtualPortGroup -Name 'portgroup name' | Set-VirtualPortGroup -VLanId 'New VLAN#'

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMware_vSphere_6-0_ESXi_V1R5_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Group-ID|V-63297, Rule-ID|SV-77787r1_rule, STIG-ID|ESXI-06-000064, Vuln-ID|V-63297

Plugin: VMware

Control ID: db7a38f918dfc5e92f005c805290f5c3ec7909199417695142c59f4eede36a47