From: Hannes Frederic Sowa <hannes@redhat.com>
To: Roy Marples <roy@marples.name>
Cc: netdev@vger.kernel.org,
"\"David S. Miller\\" <davem@davemloft.net>,
"Alexey Kuznetsov \"\"" <kuznet@ms2.inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Patrick@marples.name, McHardy@marples.name, kaber@trash.net
Subject: Re: [PATCH] ipv6: do not add link-local address if one already exists
Date: Mon, 11 Aug 2014 02:11:40 +0200 [thread overview]
Message-ID: <1407715900.2161.24.camel@localhost> (raw)
In-Reply-To: <c612bb8cad5480b08919e32f39c6d6ea@mail.marples.name>
On Mo, 2014-08-11 at 00:05 +0000, Roy Marples wrote:
> Hi
>
> On 2014-08-10 20:37, Hannes Frederic Sowa wrote:
> > On So, 2014-08-10 at 19:56 +0000, Roy Marples wrote:
> >> Currently the kernel will always add an IPv6 link-local address
> >> based on the hardware address when the interface is brought up.
> >> This is probably based on the assumption that userland would
> >> never add one before the interface is brought up.
> >>
> >> However, one at least one userland application (dhcpcd) does this so
> >> it can implement RFC7217 which can be used for link-local addresses
> >> as well.
> >>
> >> Attached is a patch which checks to see if a link-local address exists
> >> before indiscriminately adding one.
> >
> > Please have a look at:
> > https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=bc91b0f07ada5535427373a4e2050877bcc12218
> >
> > This was recently implemented just for this specific case.
>
> Is that tunable available in /proc or /sys?
> I'm not overly keen on adding a netlink call just for that in dhcpcd, it
> would be a lot of bloat compared to the kernel patch.
Can you call iproute via a script? Would that fit your needs?
https://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/?h=net-next&id=ff7c20844049be836c10087cb2418b99ff36ca2b
Bye,
Hannes
next prev parent reply other threads:[~2014-08-11 0:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-10 19:56 [PATCH] ipv6: do not add link-local address if one already exists Roy Marples
2014-08-10 20:37 ` Hannes Frederic Sowa
2014-08-11 0:05 ` Roy Marples
2014-08-11 0:11 ` Hannes Frederic Sowa [this message]
2014-08-11 21:22 ` Roy Marples
2014-08-13 17:10 ` Jiri Pirko
2014-08-11 0:27 ` YOSHIFUJI Hideaki
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