From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Yx6uq-00076O-0U for bitcoin-development@lists.sourceforge.net; Tue, 26 May 2015 04:56:36 +0000 X-ACL-Warn: Received: from resqmta-ch2-10v.sys.comcast.net ([69.252.207.42]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:AES128-SHA:128) (Exim 4.76) id 1Yx6uo-0001zA-QH for bitcoin-development@lists.sourceforge.net; Tue, 26 May 2015 04:56:35 +0000 Received: from resomta-ch2-19v.sys.comcast.net ([69.252.207.115]) by resqmta-ch2-10v.sys.comcast.net with comcast id YUwV1q0012VvR6D01UwVCd; Tue, 26 May 2015 04:56:29 +0000 Received: from crushinator.localnet ([IPv6:2601:6:4800:47f:1e4e:1f4d:332c:3bf6]) by resomta-ch2-19v.sys.comcast.net with comcast id YUwU1q00A2JF60R01UwUh5; Tue, 26 May 2015 04:56:29 +0000 From: Matt Whitlock To: Kevin Greene Date: Tue, 26 May 2015 00:56:28 -0400 Message-ID: <2508972.mm4E72Fj6S@crushinator> User-Agent: KMail/4.14.8 (Linux/3.18.11-gentoo; KDE/4.14.8; x86_64; ; ) In-Reply-To: References: <2916218.tfdjj1Sv9m@crushinator> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [69.252.207.42 listed in list.dnswl.org] 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-Headers-End: 1Yx6uo-0001zA-QH Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Zero-Conf for Full Node Discovery X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2015 04:56:36 -0000 Who would be performing a Sybil attack against themselves? We're talking about a LAN here. All the nodes would be under the control of the same entity. In that case, you actually want them all connecting solely to a central hub node on the LAN, and the hub node should connect to "diverse and unpredictable" other nodes on the Bitcoin network. On Monday, 25 May 2015, at 9:46 pm, Kevin Greene wrote: > This is something you actually don't want. In order to make it as difficult > as possible for an attacker to perform a sybil attack, you want to choose a > set of peers that is as diverse, and unpredictable as possible. > > > On Mon, May 25, 2015 at 9:37 PM, Matt Whitlock > 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* > > > > > > > > > > > > *"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.* > > > > > > ------------------------------------------------------------------------------ > > One dashboard for servers and applications across Physical-Virtual-Cloud > > Widest out-of-the-box monitoring support with 50+ applications > > Performance metrics, stats and reports that give you Actionable Insights > > Deep dive visibility with transaction tracing using APM Insight. > > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > > _______________________________________________ > > Bitcoin-development mailing list > > Bitcoin-development@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/bitcoin-development > >