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Comment: MAC address is derived from bridge-ports list since 3.6.0, not eth0

Ethernet bridges provide a means for hosts to communicate through layer 2, by connecting all of the physical and logical interfaces in the system into a single layer 2 domain. The 

Scroll Indexterm
secondarybridges
primaryMTU
bridge 
Scroll Indexterm
secondaryMTU
primarybridges
is a logical interface with a MAC address and an MTU (maximum transmission unit). The bridge MTU is the minimum MTU among all its members. By default, the bridge's MAC address is copied from eth0the MAC address of the first port in the bridge-ports list. The bridge can also be assigned an IP address, as discussed below.

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