Assign unique MAC to vlan interface?



  • Is is possible to assign a unique MAC address to a VLAN interface?

    In other words, can a vlan interface has a MAC that is different than its real interface?

    On the XG-7100, all the interfaces that are configured using the builtin switch, have the same MAC by default, and I think that is causing an issue for me where I have two interfaces (different IPs) connected to the same switch.



  • @coreybrett said in Assign unique MAC to vlan interface?:

    Is is possible to assign a unique MAC address to a VLAN interface?

    I doubt it. The only difference between a VLAN frame and non-VLAN frame coming out of the same interface is the VLAN tag. Other than configuring a locally assigned MAC, pfSense has no influence on the MAC address, which is added by the NIC, when the frame is transmitted..


  • LAYER 8 Netgate

    Yeah. a MAC address does not exist on a switch port unless it has a layer 3 interface there.

    As @jknott said all layer 3 traffic on all switch ports will have the same MAC address in general.

    You should not have two interfaces connected to another layer 2 device. If you are connecting two XG-7100 switch ports to another switch, they should be connected to ports in different VLANS (which would not mind the MAC addresses being the same) or in a LAGG.



  • @derelict said in Assign unique MAC to vlan interface?:

    As @jknott said all layer 3 traffic on all switch ports will have the same MAC address in general.

    Actually, layer 2 traffic too. The MAC address is added when the frame is created in the NIC. Layer 3 is above that.


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