netdev - Re: [RFC patch net-next] ipv4: use bcast as dst address in case IFF

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Message-ID: <0355baea-4761-477b-a68a-cd40fd5033b8@tahiti.vyatta.com>
Date:	Tue, 08 Jan 2013 11:10:33 -0800 (PST)
From:	Stephen Hemminger <stephen.hemminger@...tta.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	davem@...emloft.net, edumazet@...gle.com, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	netdev@...r.kernel.org, pavlix@...lix.net
Subject: Re: [RFC patch net-next] ipv4: use bcast as dst address in case IFF_NOARP is set


> Tue, Jan 08, 2013 at 06:11:55PM CET, stephen.hemminger@...tta.com
> wrote:
> >
> >> When IFF_NOARP is set on a device, dev->dev_addr is used as *dst*
> >> addr of sent frames. That does not make sense. Use rather bcast
> >> address
> >> instead.
> >> 
> >> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
> >
> >What did you test this on? I think this may have been
> >intentional to avoid broadcasting.
> 
> Thanks for looking at this Stephen.
> 
> I tested this on two boxes connected via ethernet.
> 
> I believe this may have been intentional, but what sense does it have
> to
> use dev_addr as destination address? That is what I do not
> understand.
> 
> Also, what is the issue with sending all packets to broadcast when
> NOARP is
> set? In my opinion, it only makes sense.
> 

It looks like NOARP devices are point-to-point and don't really
have any concept of broadcast.
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