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Re: [Ila] [5gangip] Fwd: New Version Notification for draft-herbert-ipv6-prefix-address-privacy-00.txt

Lorenzo Colitti <lorenzo@google.com> Thu, 22 February 2018 03:38 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 22 Feb 2018 12:38:15 +0900
Message-ID: <CAKD1Yr3p0P3zC_QFzQrGKAh+0eO3-rTG6_ZkWsO36dFHmk8rfQ@mail.gmail.com>
To: Tom Herbert <tom@quantonium.net>
Cc: Mikael Abrahamsson <swmike@swm.pp.se>, ila@ietf.org, int-area@ietf.org, 5GANGIP <5gangip@ietf.org>
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Subject: Re: [Ila] [5gangip] Fwd: New Version Notification for draft-herbert-ipv6-prefix-address-privacy-00.txt
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On Thu, Feb 22, 2018 at 10:51 AM, Tom Herbert <tom@quantonium.net> wrote:

> The hidden aggregation method is intended to make scaling possible.
> Each assigned block results in on entry in mapping system so total
> amount of state is num_hosts*num_blocks per host. e.g. in a network of
> 10M nodes with 100 blocks per host that's 1B entries in the mapping
> system-- should be able to scale that.


I have a fundamental problem with the assertion "should be able to scale to
1B mapping entries" given that a) current routing hardware capabilities are
three orders of magnitude away from that, and b) anyone on the Internet can
mount a state exhaustion attack on the mapping system simply by originating
a packet to any IPv6 address in the domain.

Personally I don't think this work should progress until we have line of
sight to a system that can actually do that.

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