netdev - Re: [RFC v2 2/4] net: enables interface option to skip IP

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Message-ID: <CAB=NE6VswYVF1BOM+vwEh3MaX7sh0gvLqz0U0JoEFDS-EzO9Pg@mail.gmail.com>
Date:	Thu, 20 Feb 2014 12:39:29 -0800
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
Cc:	Dan Williams <dcbw@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [RFC v2 2/4] net: enables interface option to skip IP

On Wed, Feb 19, 2014 at 11:13 AM, Zoltan Kiss <zoltan.kiss@...rix.com> wrote:
> On 19/02/14 17:20, Luis R. Rodriguez wrote:
>>>> On 19/02/14 17:20, Luis R. Rodriguez also wrote:
>>>> Zoltan has noted though some use cases of IPv4 or IPv6 addresses on
>>>> backends though <...>
>>
>> As discussed in the other threads though there *is* some use cases
>> of assigning IPv4 or IPv6 addresses to the backend interfaces though:
>> routing them (although its unclear to me if iptables can be used
>> instead, Zoltan?).
>
> Not with OVS, it steals the packet before netfilter hooks.

Got it, thanks! Can't the route be added using a front-end IP address
instead on the host though ? I just tried that on a Xen system and it
seems to work. Perhaps I'm not understand the exact topology on the
routing case. So in my case I have the backend without any IPv4 or
IPv6 interfaces, the guest has IPv4, IPv6 addresses and even a TUN for
VPN and I can create routes on the host to the front end by not using
the backend device name but instead using the front-end target IP.

  Luis
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