Hi all,
I'm having the problem Michiel describes as well. I have a bridge br2
containing 1 (but potentially more) tap interface for kvm. Windows 7 VM
doesn't like the bridge mac address to change, so I try to make it fixed.
ifconfig br2 hw ether 02:00:00:00:01:02
Interface br2 becomes instantly unreachable from the VM (via the tap
interface).
So, Michiel's claim still seems to be true: the bridge mac address
should apparently be one of the bridge interfaces.
I don't see the logic, this seems like a bug to me.
Cheers,
Rolf
------------------------------------------------------------------------
* /To/: Michel Lammertink <mlammert...@xxxxxxxxx
<mailto:[email protected]>>
* /Subject/: Re: Why should static MAC address match one of the port
MAC addresses.
* /From/: Stephen Hemminger <shemmin...@xxxxxxxxxxxxxxxxxxxx
<mailto:[email protected]>>
* /Date/: Tue, 12 Oct 2010 09:44:08 -0700
* /Cc/: bri...@xxxxxxxxxxxxxxxxxxxxxxxxxx <mailto:[email protected]>
* /In-reply-to/: <4cb46549.2070...@xxxxxxxxx
<mailto:[email protected]>>
* /Organization/: Linux Foundation
* /References/: <4cb46549.2070...@xxxxxxxxx
<mailto:[email protected]>>
------------------------------------------------------------------------
On Tue, 12 Oct 2010 15:40:25 +0200 Michel Lammertink<mlammert...@xxxxxxxxx>
wrote:
/ Hi all,/
/ /
/ I've read many messages on this mailing list with the question about/
/ setting a static MAC address on the bridge interface, but two questions/
/ remain:/
/ /
/ 1. Why should the MAC address of the bridge match the address of one of/
/ its interfaces? Setting the MAC address to a different value does not/
/ generate an error, but the bridge is not working properly (Local data/
/ does not arrive)./
No longer a requirement. It was just a good way to ensure a good
address that was unique, and not being used by other systems.
/ 2. Why does the bridge by default choose the "lowest" MAC address,/
/ instead of the MAC address of the first port added, as is proposed by/
/ the standard [1]?/
It was a convenience in original design to choose a consistent value.
Since ports can be added in any order, using the lowest seemed like
a good idea for the original author. This has been maintained for
backwards compatibility.
/ [1] IEEE802.1D, Par. 7.12.5./
/ Quote: "The Bridge Address may be the individual MAC Address of a/
/ Bridge Port, in which case, use of the address of the lowest numbered/
/ Bridge Port (Port 1) is recommended."/
/ /
/ Thanks in advance,/
/ /
/ Michel./
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