netdev - Re: [RFC NET 00/02]: Secondary unicast address support

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Date:	Thu, 21 Jun 2007 12:13:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	kaber@...sh.net, netdev@...r.kernel.org,
	shemminger@...ux-foundation.org, jeff@...zik.org
Subject: Re: [RFC NET 00/02]: Secondary unicast address support

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Thu, 21 Jun 2007 13:08:12 -0600

> However this just seems to allow a card to decode multiple mac addresses
> which in some oddball load balancing configurations may actually be
> useful, but it seems fairly limited.
> 
> Do you have a specific use case you envision for this multiple mac
> functionality?

Virtualization.

If you can't tell the ethernet card that more than 1 MAC address
are for it, you have to turn the thing into promiscuous mode.

Networking on virtualization is typically done by giving each
guest a unique MAC address, the guests have a virtual network
device that connects to the control node (or dom0 in Xen parlace)
and/or other guests.

The control node has a switch that routes the packets from the
guests either to other guests or out the real ethernet interface.

Each guest gets a unique MAC so that the switch can know which
guest an incoming packet is for.
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