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 15:10:13 -0400
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.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

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?

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

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