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List:       cypherpunks
Subject:    Re: [tahoe-dev] [tahoe-lafs] #867: use ipv6
From:       Eugen Leitl <eugen () leitl ! org>
Date:       2013-02-17 17:50:55
Message-ID: 20130217175055.GW6172 () leitl ! org
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----- Forwarded message from David-Sarah Hopwood <david-sarah@jacaranda.org> -----

From: David-Sarah Hopwood <david-sarah@jacaranda.org>
Date: Sun, 17 Feb 2013 01:07:06 +0000
To: Tahoe-LAFS development <tahoe-dev@tahoe-lafs.org>
CC: Eugen Leitl <eugen@leitl.org>
Subject: Re: [tahoe-dev] [tahoe-lafs] #867: use ipv6
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.8.1.3) \
Gecko/20070326 Thunderbird/2.0.0.0 Mnenhy/0.7.5.666

On 16/02/13 21:05, Eugen Leitl wrote:
> On Sat, Feb 16, 2013 at 03:14:54PM +0200, Randall Mason wrote:
> > On Fri, Feb 15, 2013 at 9:06 PM, Greg Troxel <gdt@ir.bbn.com> wrote:
> > 
> > > Also, fe80:: addresses should probably be ignored, as they are meant to
> > > be used only on a single link.
> 
> Please do not forget http://en.wikipedia.org/wiki/Cjdns and related, which
> 
> cjdns addresses are the first 16 bytes (128 bits) of the SHA-512 of the
> public key. All addresses must begin with the byte 0xFC, which in IPv6 resolution,
> is a private address (so there is no collision with any external Internet \
> addresses).

The prefix FC00::/7 (i.e. first byte 0xFC or 0xFD) is reserved for
"unique local addresses" (see http://en.wikipedia.org/wiki/Unique_local_address
and RFC 4193). However, I don't think that the arguments that Greg Troxel put
forward apply to such addresses, in general. It's quite plausible that a
Tahoe-LAFS grid could be made up entirely of nodes that are inter-routable
using FC00::/7 addresses.

-- 
David-Sarah Hopwood b%




----- End forwarded message -----
-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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