Re: Why should static MAC address match one of the port MAC addresses - bug?

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On Sun, 26 Dec 2010 18:21:58 +0100
Rolf Fokkens <rolf.fokkens@xxxxxxxxxx> wrote:

> In this particular situation it's not possible to do so as all 
> interfaces are tap interfaces, with random generated MAC addresses. 
> Changing the tap interface's MAC address results in this:
> 
>     [root@home01 ~]# ifconfig tap0 hw ether BA:B7:73:58:E6:E2
>     SIOCSIFHWADDR: Device or resource busy
>     [root@home01 ~]#
> 
> So that doen't work. I found a trick however: I added a dummy ethernet 
> interface to the bridge, of which i can specify the MAC address, It 
> works fine, but in syslog there's the following message:
> 
>     Dec 26 17:45:21 home01 kernel: [   29.316480] br0: new device dummy0
>     does not support netpoll (disabling)
> 
> This means that the bridge won't use/support netpoll at all, which may 
> mean there's an impact on performance. I'm not sure. I can imagine that 
> a netpoll interface for a dummy interface shouldn't be hard to implement.
> 

The message means you can't use kdump/netconsole/kgdb over
that bridge device.
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