netdev - Re: [net-next PATCH v3] ipv4: allow warming up the ARP cache with request type gratuitous ARP

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Message-Id: <20100119.021138.172154379.davem@davemloft.net>
Date:	Tue, 19 Jan 2010 02:11:38 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	lk-netdev@...netdev.nosense.org
Cc:	opurdila@...acom.com, ja@....bg, chavey@...gle.com,
	netdev@...r.kernel.org
Subject: Re: [net-next PATCH v3] ipv4: allow warming up the ARP cache with
 request type gratuitous ARP

From: Mark Smith <lk-netdev@...netdev.nosense.org>
Date: Tue, 19 Jan 2010 10:09:13 +1030

> I don't think this complies with the ARP RFC (RFC826). Walking through
> the validation steps, Gratuitous ARP seems to only pass if there is an
> existing entry in the table, otherwise they'd fail, as the target
> address in the GA packet doesn't match that of the receiving host.

It's fine if it's guarded by the per-device ARP_ACCEPT sysctl which
defaults to off, and that's what he's doing.
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