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Re: RFC4941bis implementations

Florian Obser <florian@openbsd.org> Thu, 02 April 2020 20:11 UTC

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Date: Thu, 02 Apr 2020 22:11:40 +0200
From: Florian Obser <florian@openbsd.org>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Cc: ipv6@ietf.org
Subject: Re: RFC4941bis implementations
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On Thu, Apr 02, 2020 at 09:09:26PM +0200, Alexandre Petrescu wrote:
> Le 02/04/2020 à 19:26, Fernando Gont a écrit :
> > Folks,
> > 
> > FWIW, I produce a patch for Linux kernel (net-next) that implements
> > rfc4941bis:
> > https://www.gont.com.ar/code/fgont-patch-linux-net-next-rfc4941bis.txt
> > (up & running here).
> 
> Does it work with a plen 65 in RA?

I'm happy to report that slaacd(8) in OpenBSD does not care about the plen.
It just forms a 128 bit random number and overwrites the front with
the prefix.[1]
So if you put your whole /29 onlink you can have 99 bits of entropy!

Cheers,
Florian

> 
> Alex, LF/HF 1

1) https://github.com/openbsd/src/blob/master/sbin/slaacd/engine.c#L1415

-- 
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