Displaying the virtual MAC address
Every FortiGate unit physical interface has two MAC addresses: the current hardware address and the permanent hardware address. The permanent hardware address cannot be changed, it is the actual MAC address of the interface hardware. The current hardware address can be changed. The current hardware address is the address seen by the network. For a FortiGate unit not operating in HA, you can use the following command to change the current hardware address of the port1 interface:
config system interface edit port1
set macaddr <mac_address>
end end
For an operating cluster, the current hardware address of each cluster unit interface is changed to the HA virtual MAC address by the FGCP. The macaddr option is not available for a functioning cluster. You cannot change an interface MAC address and you cannot view MAC addresses from the system interface CLI command.
You can use the get hardware nic <interface_name_str> command to display both MAC addresses for any FortiGate interface. This command displays hardware information for the specified interface. Depending on their hardware configuration, this command may display different information for different interfaces. You can use this command to display the current hardware address as Current_HWaddr and the permanent hardware address as Permanent_HWaddr. For some interfaces the current hardware address is displayed as MAC. The command displays a great deal of information about the interface so you may have to scroll the output to find the hardware addresses.
You can also use the diagnose hardware deviceinfo nic <interface_str> command to display both MAC addresses for any FortiGate interface.
Before HA configuration the current and permanent hardware addresses are the same. For example for one of the units in Cluster_1:
FGT60B3907503171 # get hardware nic internal
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MAC: 02:09:0f:78:18:c9
Permanent_HWaddr: 02:09:0f:78:18:c9
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During HA operation the current hardware address becomes the HA virtual MAC address, for example for the units in Cluster_1:
FGT60B3907503171 # get hardware nic internal
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MAC: 00:09:0f:09:00:02
Permanent_HWaddr: 02:09:0f:78:18:c9
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The following command output for Cluster_2 shows the same current hardware address for port1 as for the internal interface of Cluster_2, indicating a MAC address conflict.
FG300A2904500238 # get hardware nic port1
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MAC: 00:09:0f:09:00:02
Permanent_HWaddr: 00:09:0F:85:40:FD
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