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Re: [v6ops] I-D Action: draft-ietf-v6ops-ula-usage-recommendations-02.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 19 February 2014 22:08 UTC

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Date: Thu, 20 Feb 2014 11:08:03 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Alexandru Petrescu <alexandru.petrescu@gmail.com>
References: <20140214091302.13219.20624.idtracker@ietfa.amsl.com> <m21tz6javn.wl%randy@psg.com> <1442fd6c81e.5859224653900445752.5189762259388794287@internetdraft.org> <52FEBE28.1010006@gmail.com> <8E2A8B56-6F05-4F09-BE7E-651B9CA42458@delong.com> <5300CE32.1050808@gmail.com> <BD473E46-E382-44E6-B474-A56D074318FA@delong.com> <530104B3.3070205@gmail.com> <53010E70.5000401@gmail.com> <20140217110013.GA31822@mushkin> <62FF9B8A-2F21-4FDD-B1D2-82B8C02A21B3@delong.com> <37638184-17C6-4C8B-86B1-C596A5A5504A@nominum.com> <530242C3.4070108@bogus.com> <E91E49CA-7BA6-4DA3-B4F3-46BB0F25F8F1@delong.com> <5303CD3E.1010907@gmail.com> <m2a9dnr4vk.wl%randy@psg.com> <5304BAAF.60608@gmail.com>
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-ula-usage-recommendations-02.txt
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On 20/02/2014 03:07, Alexandru Petrescu wrote:
> Le 19/02/2014 07:30, Randy Bush a écrit :
>>> But ULAs aren't bogons. They aren't supposed to be routed, but
>>> if some people break that rule, is a ULA prefix objectively any
>>> more harmful than an "official" PI prefix?
>>
>> guaranteed no colision
> 
> ULA presence in the wild - a bad thing - may be detected faster if it
> were colliding with another.  Whereas PI presence in the wild is not
> known whether it is a good or a bad thing in the first place.

ULA collisions can occur in two cases:

1. More than one party not following the spec on how to generate
a ULA prefix - so they will be punished for their own mistakes.

2. A piece of remarkably bad luck, rather less likely than
winning any lottery I'm aware of.

Are we really going to worry about this? Especially since neither
case applies in in wide-area routing, where ULAs should always be
filtered anyway.

    Brian

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