netdev - Re: [RFC] ARP notify option

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Message-ID: <20070306145241.5ec1c511@freekitty>
Date:	Tue, 6 Mar 2007 14:52:41 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"Chris Friesen" <cfriesen@...tel.com>
Cc:	David Miller <davem@...emloft.net>, jeremy@...p.org, ak@....de,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	chrisw@...s-sol.org, zach@...are.com, rusty@...tcorp.com.au,
	ian.pratt@...source.com, Christian.Limpach@...cam.ac.uk,
	netdev@...r.kernel.org, jeff@...zik.org
Subject: Re: [RFC] ARP notify option

On Tue, 06 Mar 2007 15:18:07 -0600
"Chris Friesen" <cfriesen@...tel.com> wrote:

> Stephen Hemminger wrote:
> 
> > +arp_notify - BOOLEAN
> > +	Define mode for notification of address and device changes.
> > +	0 - (default): do nothing
> > +	1 - Generate gratuitous arp replies when device is brought up
> > +	    or hardware address changes.
> 
> Did you consider using gratuitous arp requests instead?  I remember 
> reading about some hardware that updated its arp cache on gratuitous 
> requests but not gratuitous replies.
> 
> Chris

I copied the ARP generation from other places that were doing
gratuitous ARP already:  Xen and irlan.
Our local switch used REPLY's to do the same thing.

One could imagine making it a ternary value and having 2 generate
REQUEST's.


-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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