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

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Date:	Sat, 11 Jan 2014 05:06:10 -0800 (PST)
From:	François-Xavier Le Bail <fx.lebail@...oo.com>
To:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
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

On Sat, 1/11/14, Alexey Kuznetsov <kuznet@....inr.ac.ru> wrote:

> Hello!

> I am just curious: since when is TCP allowed to use anycast addresses?

As said in http://tools.ietf.org/html/draft-iab-anycast-arch-implications-12.html#section-2.1
(this informational draft is in RCF queue)

"  No firm conclusion was reached regarding
   use of TCP with anycasted services, but it was observed that
   anycasting was useful for DNS, although it did introduce some new
   complexities."

For this works, there is need for appropriate routing (BGP, ...).

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."

François-Xavier Le Bail
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