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Re: Anycast usage, final diagnosis? (was: IPv6: Fix broken anycast

To: kuznet@xxxxxxxxxxxxx
Subject: Re: Anycast usage, final diagnosis? (was: IPv6: Fix broken anycast
From: Pekka Savola <pekkas@xxxxxxxxxx>
Date: Thu, 17 Jul 2003 13:41:31 +0300 (EEST)
Cc: Mika Liljeberg <mika.liljeberg@xxxxxxxxx>, <davem@xxxxxxxxxx>, <jmorris@xxxxxxxxxx>, <netdev@xxxxxxxxxxx>, <dlstevens@xxxxxxxxxx>
In-reply-to: <200307171030.OAA13906@dub.inr.ac.ru>
Sender: netdev-bounce@xxxxxxxxxxx
On Thu, 17 Jul 2003 kuznet@xxxxxxxxxxxxx wrote:
> Wait a second. What the hell is this in anycast.c? How is it possible
> to allow to any user to create reserved anycast?
> This makes them completely useless, everyone on LAN can join
> anycast service and blackhole it, which will prevent listening by real 
> servers.
> 
> This cannot be right. I think the logic is illegally stolen
> from multicast interface: only superuser calls can create/delete anycasts.
> Non-superuser can only listen existing one.
> 
> I would block JOIN/LEAVE for non-superuser completely.

No user should be able to join anycast group, IMHO.

(Of course, that hasn't been specifed anywhere, but the implementations 
should do what they think is best -- and I certainly think this is.)

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings


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