Package: bridge-utils
Version: 1.6-5+b1
Followup-For: Bug #981076

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Having further googled this and made a few tests, the key difference seems to 
be whether the removable devices are declared in the auto or in the 
allow-hotplug lines of /etc/network/interfaces.

If removable devices are declared in auto, no attempt to generate their fe80 
address is made. Configuration is done as per each device's declaration in the 
configuration file (in my case, manual method and hostapd 
/etc/hostapd/hostapd.conf), and the bridge uses whatever MAC address is 
declared via bridge_hw to generate its fe80 address.

If removable devices are declared in allow-hotplug, ifup randomly fails for 
some devices and generates the fe80 address for other devices. The bridge picks 
up the fe80 of whichever removable device was succesfully brought up, 
regardless of what bridge_hw would suggest as the basis for EUI64 generation of 
the fe80 address for the bridge.

- From a user perspective, I wouldn't know if this discrepancy in behavior 
between auto and allow-hotplug, for removable devices participating in a 
bridge, is the kernel's or bridge-utils' fault.

Martin-Éric

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