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Re: Reducing the battery impact of ND

Lorenzo Colitti <lorenzo@google.com> Thu, 30 January 2014 18:42 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 30 Jan 2014 10:41:40 -0800
Message-ID: <CAKD1Yr2a2icHCdG_ROmFZHp5mzgYHSXdmw_GHf+X=NBU5E2G9Q@mail.gmail.com>
Subject: Re: Reducing the battery impact of ND
To: Warren Kumari <warren@kumari.net>
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Cc: 6man Chairs <6man-chairs@tools.ietf.org>, Erik Nordmark <nordmark@acm.org>, Andrew Yourtchenko <ayourtch@gmail.com>, 6man WG <ipv6@ietf.org>
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On Thu, Jan 30, 2014 at 3:12 AM, Warren Kumari <warren@kumari.net> wrote:

> ... and can someone please remind me what exactly was wrong with ARP?
>  Other than the fact that v4 uses it?!


It's not energy-efficient. When anyone sends an ARP request, every node on
the link has to wake up to process it, even though the packet is useful for
only one node. Typically, ARP is also chattier than ND in terms of
multicast/broadcast packets, because (in most implementations) it relies on
timeouts rather than unreachability detection via unicast probes.

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