netdev - Re: [PATCH net-2.6][NEIGH] Updating affected neighbours when about MAC address change

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Message-ID: <31436f4a0712230504x7b0b4f38i8f69a7a825bcc14b@mail.gmail.com>
Date:	Sun, 23 Dec 2007 15:04:37 +0200
From:	"David Shwatrz" <dshwatrz@...il.com>
To:	"YOSHIFUJI Hideaki / 吉藤英明" 
	<yoshfuji@...ux-ipv6.org>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6][NEIGH] Updating affected neighbours when about MAC address change

Hello,


>You should iterate all of ifa_list (for IPv4) / addr_list (for IPv6).
> For IPv6, we also have anycast (maintained by ac_list) as well.

I am not sure that we need to iterate all of ifa_list in IPv4.
The reason is that we end with arp_send, and it initiates a broadcast.
So all neighbours will receive it and update their arp tables
accordingly.
The dest hw in the arp_send is NULL according to this patch ; this means that
we will assign dev->broadcast to dest_hw  in apr_create().

It seems to me there's no reason to send more than one broadcast.

In IPv6, I need to check, since it is multicast.

Thoughts ?

Regards,
DS





On Dec 23, 2007 2:38 PM, YOSHIFUJI Hideaki / 吉藤英明
<yoshfuji@...ux-ipv6.org> wrote:
> In article <31436f4a0712230424n1cfaeb27o463e62093af41090@...l.gmail.com> (at Sun, 23 Dec 2007 14:24:00 +0200), "David Shwatrz" <dshwatrz@...il.com> says:
>
> > Regarding your answer;  I accept it and I will soon send a revised
> > version of this patch (making changes to
> >  arp_netdev_event() and ndisc_netdev_event().)
> > I had  IPv4 in mind, there is no reason that it will no be also in IPv6.
>
> You should iterate all of ifa_list (for IPv4) / addr_list (for IPv6).
> For IPv6, we also have anycast (maintained by ac_list) as well.
>
> --yoshfuji
>
>
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