Bridge interface and MAC address spoofing

Yanapa

Hi,

I just spent a few hours to understand why I wasn't able to ping my gateway after enabling my bridge between my LAN_WIRED interface and my LAN_WIFI interface.
Note that I was not able to ping my devices from pfSense console too.

I read this documentation to enable it and to enforce the bridge MAC address:
https://docs.netgate.com/pfsense/en/latest/bridges/interfaces.html

I finally found that it was caused by the MAC address enforced on the bridge interface (that I got from an online generator): 0B:49:AE:AB:E2:84

After removing it or replacing it with another one auto-generated by pfSense, it worked immediately.

Can someone explain why it is not working when this MAC address is used ?

johnpoz

0B as your first octet is a multicast mac address..

https://networklessons.com/multicast/multicast-ip-address-to-mac-address-mapping

0B would be 00001011

Which means that multicast bit is set..

Yanapa

@johnpoz, thank you.