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Re: IPv6 Formal Anycast Addresses and Functional Anycast Addresses (Fwd: New Version Notification for draft-smith-6man-form-func-anycast-addresses-01.txt)

Nick Hilliard <nick@foobar.org> Sun, 03 November 2019 23:51 UTC

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Subject: Re: IPv6 Formal Anycast Addresses and Functional Anycast Addresses (Fwd: New Version Notification for draft-smith-6man-form-func-anycast-addresses-01.txt)
To: Toerless Eckert <tte@cs.fau.de>
Cc: Fred Baker <fredbaker.ietf@gmail.com>, 6MAN <6man@ietf.org>
References: <157277906705.13535.345852921709779212.idtracker@ietfa.amsl.com> <CAO42Z2wSU-puDaQq-PzTCTE=S3qyqUNrPhH0pgOEO_d3=StnHA@mail.gmail.com> <b97c15c0-b1fe-0d78-0897-5fc4bb6a9a34@foobar.org> <B42E6EED-5620-49BE-BB3D-B1CF6F04A1CC@gmail.com> <20191103212712.GK2287@faui48f.informatik.uni-erlangen.de> <B2A9EAB8-BF52-4302-BB77-70EE252F45E5@gmail.com> <20191103225223.GL2287@faui48f.informatik.uni-erlangen.de>
From: Nick Hilliard <nick@foobar.org>
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Date: Sun, 03 Nov 2019 23:51:43 +0000
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Toerless Eckert wrote on 03/11/2019 22:52:
> Aka: DNS over TCP would likely work in most cases, but not if for
> example there is an ECMP node to two root servers along the path.
Most n-tuple hashes used as load balancing discriminants tend to use 
src/dst ip, protocol and src/dst port.  Anycast TCP works well for tcp 
sessions which only involve a couple of exchanges back and forth, i.e. 
it's generally fine for short-lived dns-over-tcp conversations, even if 
there are ecmp / lag links somewhere along the path.

Nick

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