netdev - Re: [PATCH net-next 0/3 v4] changes to make ipv4 routing table aware of next-hop link status

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Date:	Wed, 17 Jun 2015 21:52:11 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
CC:	netdev@...r.kernel.org, davem@...emloft.net,
	ddutt@...ulusnetworks.com, sfeldma@...il.com,
	alexander.duyck@...il.com, hannes@...essinduktion.org,
	stephen@...workplumber.org
Subject: Re: [PATCH net-next 0/3 v4] changes to make ipv4 routing table aware
 of next-hop link status

Le 17/06/2015 21:10, Andy Gospodarek a écrit :
> On Wed, Jun 17, 2015 at 06:05:32PM +0200, Nicolas Dichtel wrote:
>> Le 15/06/2015 18:33, Andy Gospodarek a écrit :
>>> This series adds the ability to have the Linux kernel track whether or
>>> not a particular route should be used based on the link-status of the
>>> interface associated with the next-hop.
>>>
>>> Before this patch any link-failure on an interface that was serving as a
>>> gateway for some systems could result in those systems being isolated
>> >from the rest of the network as the stack would continue to attempt to
>>> send frames out of an interface that is actually linked-down.  When the
>>> kernel is responsible for all forwarding, it should also be responsible
>>> for taking action when the traffic can no longer be forwarded -- there
>>> is no real need to outsource link-monitoring to userspace anymore.
>>>
>>> This feature is only enabled with the new per-interface or ipv4 global
>>> sysctls called 'ignore_routes_with_linkdown'.
>>>
>>> net.ipv4.conf.all.ignore_routes_with_linkdown = 0
>>> net.ipv4.conf.default.ignore_routes_with_linkdown = 0
>>> net.ipv4.conf.lo.ignore_routes_with_linkdown = 0
>>> ...
>> Sorry for my late reply, but is it possible to advertise this sysctl via the
>> netconf infra (grep NETCONFA_)?
> I would be happy to do that.  Do you see it as a requirement for this
> set to be accepted?
No, but it would be great to do it before net-next closes.

>
> I've got to add ipv6 support, so netconf support could also easily be
> added in the kernel and iproute2.
Ok.
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