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Date: Mon, 25 May 2015 23:48:16 -0500
Message-ID: <CANe1mWzeLsOWv+2qwx1b3s61HqCwy5GLd2Rv3LgWLrOa_jkFjw@mail.gmail.com>
From: Jim Phillips <jim@ergophobia.org>
To: Matt Whitlock <bip@mattwhitlock.name>
Content-Type: multipart/alternative; boundary=089e013c673cb391ff0516f4d504
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
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Do any wallets actually do this yet?
On May 25, 2015 11:37 PM, "Matt Whitlock" <bip@mattwhitlock.name> wrote:

> This is very simple to do. Just ping the "all nodes" address (ff02::1) and
> try connecting to TCP port 8333 of each node that responds. Shouldn't take
> but more than a few milliseconds on any but the most densely populated LANs.
>
>
> On Monday, 25 May 2015, at 11:06 pm, Jim Phillips wrote:
> > Is there any work being done on using some kind of zero-conf service
> > discovery protocol so that lightweight clients can find a full node on
> the
> > same LAN to peer with rather than having to tie up WAN bandwidth?
> >
> > I envision a future where lightweight devices within a home use SPV over
> > WiFi to connect with a home server which in turn relays the transactions
> > they create out to the larger and faster relays on the Internet.
> >
> > In a situation where there are hundreds or thousands of small SPV devices
> > in a single home (if 21, Inc. is successful) monitoring the blockchain,
> > this could result in lower traffic across the slow WAN connection.  And
> > yes, I realize it could potentially take a LOT of these devices before
> the
> > total bandwidth is greater than downloading a full copy of the
> blockchain,
> > but there's other reasons to host your own full node -- trust being one.
> >
> > --
> > *James G. Phillips IV*
> > <https://plus.google.com/u/0/113107039501292625391/posts>
> > <http://www.linkedin.com/in/ergophobe>
> >
> > *"Don't bunt. Aim out of the ball park. Aim for the company of
> immortals."
> > -- David Ogilvy*
> >
> >  *This message was created with 100% recycled electrons. Please think
> twice
> > before printing.*
>

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<p dir=3D"ltr">Do any wallets actually do this yet?</p>
<div class=3D"gmail_quote">On May 25, 2015 11:37 PM, &quot;Matt Whitlock&qu=
ot; &lt;<a href=3D"mailto:bip@mattwhitlock.name">bip@mattwhitlock.name</a>&=
gt; wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">This is =
very simple to do. Just ping the &quot;all nodes&quot; address (ff02::1) an=
d try connecting to TCP port 8333 of each node that responds. Shouldn&#39;t=
 take but more than a few milliseconds on any but the most densely populate=
d LANs.<br>
<br>
<br>
On Monday, 25 May 2015, at 11:06 pm, Jim Phillips wrote:<br>
&gt; Is there any work being done on using some kind of zero-conf service<b=
r>
&gt; discovery protocol so that lightweight clients can find a full node on=
 the<br>
&gt; same LAN to peer with rather than having to tie up WAN bandwidth?<br>
&gt;<br>
&gt; I envision a future where lightweight devices within a home use SPV ov=
er<br>
&gt; WiFi to connect with a home server which in turn relays the transactio=
ns<br>
&gt; they create out to the larger and faster relays on the Internet.<br>
&gt;<br>
&gt; In a situation where there are hundreds or thousands of small SPV devi=
ces<br>
&gt; in a single home (if 21, Inc. is successful) monitoring the blockchain=
,<br>
&gt; this could result in lower traffic across the slow WAN connection.=C2=
=A0 And<br>
&gt; yes, I realize it could potentially take a LOT of these devices before=
 the<br>
&gt; total bandwidth is greater than downloading a full copy of the blockch=
ain,<br>
&gt; but there&#39;s other reasons to host your own full node -- trust bein=
g one.<br>
&gt;<br>
&gt; --<br>
&gt; *James G. Phillips IV*<br>
&gt; &lt;<a href=3D"https://plus.google.com/u/0/113107039501292625391/posts=
" target=3D"_blank">https://plus.google.com/u/0/113107039501292625391/posts=
</a>&gt;<br>
&gt; &lt;<a href=3D"http://www.linkedin.com/in/ergophobe" target=3D"_blank"=
>http://www.linkedin.com/in/ergophobe</a>&gt;<br>
&gt;<br>
&gt; *&quot;Don&#39;t bunt. Aim out of the ball park. Aim for the company o=
f immortals.&quot;<br>
&gt; -- David Ogilvy*<br>
&gt;<br>
&gt;=C2=A0 *This message was created with 100% recycled electrons. Please t=
hink twice<br>
&gt; before printing.*<br>
</blockquote></div>

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