netdev - Re: [PATCH net-next 1/2] net: neighbour: Add mcast_resolicit to configure the number of multicast resolicitations in PROBE state.

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Date:	Fri, 20 Mar 2015 21:47:56 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	hideaki.yoshifuji@...aclelinux.com
Cc:	netdev@...r.kernel.org, Yanjun.Zhu@...driver.com,
	ulf.samuelsson@...csson.com
Subject: Re: [PATCH net-next 1/2] net: neighbour: Add mcast_resolicit to
 configure the number of multicast resolicitations in PROBE state.

From: YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>
Date: Thu, 19 Mar 2015 22:41:46 +0900 (JST)

> We send unicast neighbor (ARP or NDP) solicitations ucast_probes
> times in PROBE state.  Zhu Yanjun reported that some implementation
> does not reply against them and the entry will become FAILED, which
> is undesirable.
> 
> We had been dealt with such nodes by sending multicast probes mcast_
> solicit times after unicast probes in PROBE state.  In 2003, I made
> a change not to send them to improve compatibility with IPv6 NDP.
> 
> Let's introduce per-protocol per-interface sysctl knob "mcast_
> reprobe" to configure the number of multicast (re)solicitation for
> reconfirmation in PROBE state.  The default is 0, since we have
> been doing so for 10+ years.
> 
> Reported-by: Zhu Yanjun <Yanjun.Zhu@...driver.com>
> CC: Ulf Samuelsson <ulf.samuelsson@...csson.com>
> Signed-off-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>
> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>

Applied to net-next.
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