netdev - Re: [RFC 2/2] xen-netback: disable multicast and use a random hw MAC address

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Message-ID: <CAB=NE6Vf4KHyMGiGZuuvZ8uWhw51UXbhHPt5RxqZaJbLHOU71w@mail.gmail.com>
Date:	Wed, 12 Feb 2014 20:27:52 -0800
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	xen-devel@...ts.xenproject.org,
	Paul Durrant <Paul.Durrant@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>, kvm@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 2/2] xen-netback: disable multicast and use a random hw MAC address

On Wed, Feb 12, 2014 at 2:05 PM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
> We have to be careful for sure, I'll try to test all cases including
> kvm, but architecturally as I see it so far these things are simply
> exchanging over data through their respective backend channels, I know
> ipv6 interfaces are unused and I'm going to dig further to see why at
> least one ipv4 interfaces is needed. I cannot fathom why either of
> these interfaces would be required. I'll do a bit more digging.
>
> The TAP interface requirements may be different, I haven't yet dug into that.

I have a test patch that now works that restricts xen-netback from
getting any IPv4 and IPv6 addresses, and disables multicast. With this
set in place the xen-frontend still gets IPv4 and IPv6 addresses and
Multicast still works. This was tested under a shared physical
environment, I'll have to test NAT next, and also see if we can enable
this as an option for KVM for their TAP 'backend' interfaces.

  Luis
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