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Re: [Xen-devel] vif tx drops

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] vif tx drops
From: Brian Wolfe <brianw@xxxxxxxxxxxx>
Date: Wed, 13 Oct 2004 22:07:57 -0500
Cc: David Becker <becker@xxxxxxxxxxx>, Xen Devel Mailing List <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
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I temporarilly solved this by converting the IP to hexidecimal and
setting the first 2 bytes of the mac to DE:AD. Unfortunately xen
increments the 3rd if you set the mac. We need a way to set the mac on
both ends of the vif device. 

Maybe we can have things this way. options...
a: set the mac on one end and have a standard "increment" bit somewhere
higher up(say first byte).
b: set the macs on both ends
c: set a specific range of macs to use

Either way xen really should test (not certain how exactly) to see if
it's already in existence prior to using a mac that is dynamicly set.
Not testing is playing russian roulette IMHO (as some including myself
have found out already).

Opinions?

On Wed, 2004-10-13 at 15:17, Keir Fraser wrote:
> > 
> > " This is *definitely* worth checking
> > " out at this point, and can be fixed by picking your own MAC addresses.
> > 
> > Yep.  How big a space do you randomize for mac addrs?
> > 
> > # grep -i AA:00:00:24:22:F3 a
> > batch009 (172.16.12.19) at AA:00:00:24:22:F3 [ether] on eth0
> > batch075 (172.16.12.85) at AA:00:00:24:22:F3 [ether] on eth0
> > 
> 
> I think AA:00:00:00:00:00 - AA:00:00:7F:FF:FF (i.e., 8 million
> addresses). But the random-number generator is crap.
> 
> You're definitely best off generating your own if creating any decent
> number of VMs.
> 
>  -- Keir
> 
> 
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