netdev - Re: [PATCH net-next] IPv6: enable TCP to use an anycast address

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Message-ID: <CAMrnHh76D1d_JrXhtz+nvJP+Aiux2iPW+5uVZqQpbmWbQG0=OQ@mail.gmail.com>
Date:	Sat, 11 Jan 2014 17:38:27 +0400
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	François-Xavier Le Bail <fx.lebail@...oo.com>
Cc:	netdev@...r.kernel.org,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"David S. Miller" <davem@...emloft.net>,
	James Morris <jmorris@...ei.org>,
	Hideaki Yoshifuji <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-next] IPv6: enable TCP to use an anycast address

Hello!

On Sat, Jan 11, 2014 at 5:06 PM, François-Xavier Le Bail
<fx.lebail@...oo.com> wrote:
> Many DNS root-servers use TCP with anycast (IPv4 and IPV6).
>
> see : http://tools.ietf.org/html/draft-jabley-dnsop-anycast-mapping-04#section-4
>
> "   L-Root service is provided using a single IPv4 address (199.7.83.42)
>    and a single IPv6 address (2001:500:3::42).  It should be noted that
>    it is preferable to refer to the service using its DNS name (L.ROOT-
>    SERVERS.NET) rather than literal addresses, since addresses can
>    change from time to time."

Is this all? It looks like this implies routing by deep packet inspection,
fetching some creepy node identification options from inside DNS payload
(not written directly, but  implied). This smells funky.

Actually, I was alerted by reset processing in your patch, it cannot be right.

Do not you think this must not be enabled for common use? At least
some separate sysctl disabled by default.
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