Re: how to set multicast MAC ligitemately?

[Pekka Savola]

On Sat, 27 Sep 2003, Alexey V. Yurchenko wrote:
> On Fri, 26 Sep 2003 12:03:45 -0700
> Stephen Hemminger <shemminger@xxxxxxxx> wrote:
> 
> > 
> > Not interface should have a multicast MAC address. A multicast address
> > should only exist as a destination address, never a source.
> 
> Well, that's in theory. In practice I need several computers connected
> to a switch to share a single interface and look to the rest of LAN as a
> single node. All those computers must receive all packets desitned to
> that interface. Using non-multicast MAC confuses many switches.

This likely breaks with IGMP snooping switches, btw.

> Any suggestions? (Except not using a switch ;))
> 
> PS isn't this approach (forbidding certain addresses) a tad
> Microsoftish? Like saving users from themselves?

The rules are there to prevent users from shooting themselves in the foot, 
or the users thinking using multicast MAC address as source is a right way 
to solve a problem.

But Linux is Free Software and Open Source.  You can change these things 
if you really want.

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings


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