netdev - Re: [PATCH] ipv4: arp: process only if ipv4 address configured

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Message-ID: <1392229587.1752.11.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 12 Feb 2014 10:26:27 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Florian Westphal <fw@...len.de>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: arp: process only if ipv4 address configured

On Wed, 2014-02-12 at 18:27 +0100, Florian Westphal wrote:
> 8030f54499925d073a88c09f ([IPV4] devinet: Register inetdev earlier.)
> changed arp behaviour (2.6.22 onwards).
> 
> Before this, inetdev_init() was called only when the first address was
> added to the interface, i.e. arp_process always dropped incoming arp
> packets as __in_dev_get_rcu() returned NULL when no IP address was set
> on the interface.
> 
> With >= 2.6.22 we now process arp packets even if no address is assigned.
> It can cause issues if the machine has several interfaces in the same
> segment; requests receive answers from multiple macs.


What about arp_filter value/meaning ?



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