Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
Also think it would be useful. Created an issue for it some time back: https://github.com/bitcoin/bitcoin/issues/3802 I think nodes don't only have to connect to LAN nodes. Especially with headers first. They can still connect to other nodes as well. Having said that security is problematic in any case on a hotel wifi or similar. All traffic can be spoofed. With HF they'd be loading most of the data from the LAN node though. This will help people having multiple nodes at home reduce bandwidth and improve sync without difficult setup. On Tue, 26 May 2015 at 12:50 Mike Hearn m...@plan99.net wrote: Very interesting Matt. For what it's worth, in future bitcoinj is very likely to bootstrap from Cartographer nodes (signed HTTP) rather than DNS, and we're also steadily working towards Tor by default. So this approach will probably stop working at some point. As breaking PorcFest would kind of suck, we might want a ZeroConf/Rendezvous solution in place so local LANs can capture Bitcoin traffic away from Tor (with some notification to the user, presumably). On Tue, May 26, 2015 at 7:47 AM, Matt Whitlock b...@mattwhitlock.name wrote: On Tuesday, 26 May 2015, at 1:15 am, Peter Todd wrote: On Tue, May 26, 2015 at 12:52:07AM -0400, Matt Whitlock wrote: On Monday, 25 May 2015, at 11:48 pm, Jim Phillips wrote: Do any wallets actually do this yet? Not that I know of, but they do seed their address database via DNS, which you can poison if you control the LAN's DNS resolver. I did this for a Bitcoin-only Wi-Fi network I operated at a remote festival. We had well over a hundred lightweight wallets, all trying to connect to the Bitcoin P2P network over a very bandwidth-constrained Internet link, so I poisoned the DNS and rejected all outbound connection attempts on port 8333, to force all the wallets to connect to a single local full node, which had connectivity to a single remote node over the Internet. Thus, all the lightweight wallets at the festival had Bitcoin network connectivity, but we only needed to backhaul the Bitcoin network's transaction traffic once. Interesting! What festival was this? The Porcupine Freedom Festival (PorcFest) in New Hampshire last summer. I strongly suspect that it's the largest gathering of Bitcoin users at any event that is not specifically Bitcoin-themed. There's a lot of overlap between the Bitcoin and liberty communities. PorcFest draws somewhere around 1000-2000 attendees, a solid quarter of whom have Bitcoin wallets on their mobile devices. The backhaul was a 3G cellular Internet connection, and the local Bitcoin node and network router were hosted on a Raspberry Pi with some Netfilter tricks to restrict connectivity. The net result was that all Bitcoin nodes (lightweight and heavyweight) on the local Wi-Fi network were unable to connect to any Bitcoin nodes except for the local node, which they discovered via DNS. I also had provisions in place to allow outbound connectivity to the API servers for Mycelium, Blockchain, and Coinbase wallets, by feeding the DNS resolver's results in real-time into a whitelisting Netfilter rule utilizing IP Sets. For your amusement, here's the graphic for the banner that I had made to advertise the network at the festival (*chuckle*): http://www.mattwhitlock.com/bitcoin_wifi.png -- 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 -- 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 -- ___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
Very interesting Matt. For what it's worth, in future bitcoinj is very likely to bootstrap from Cartographer nodes (signed HTTP) rather than DNS, and we're also steadily working towards Tor by default. So this approach will probably stop working at some point. As breaking PorcFest would kind of suck, we might want a ZeroConf/Rendezvous solution in place so local LANs can capture Bitcoin traffic away from Tor (with some notification to the user, presumably). On Tue, May 26, 2015 at 7:47 AM, Matt Whitlock b...@mattwhitlock.name wrote: On Tuesday, 26 May 2015, at 1:15 am, Peter Todd wrote: On Tue, May 26, 2015 at 12:52:07AM -0400, Matt Whitlock wrote: On Monday, 25 May 2015, at 11:48 pm, Jim Phillips wrote: Do any wallets actually do this yet? Not that I know of, but they do seed their address database via DNS, which you can poison if you control the LAN's DNS resolver. I did this for a Bitcoin-only Wi-Fi network I operated at a remote festival. We had well over a hundred lightweight wallets, all trying to connect to the Bitcoin P2P network over a very bandwidth-constrained Internet link, so I poisoned the DNS and rejected all outbound connection attempts on port 8333, to force all the wallets to connect to a single local full node, which had connectivity to a single remote node over the Internet. Thus, all the lightweight wallets at the festival had Bitcoin network connectivity, but we only needed to backhaul the Bitcoin network's transaction traffic once. Interesting! What festival was this? The Porcupine Freedom Festival (PorcFest) in New Hampshire last summer. I strongly suspect that it's the largest gathering of Bitcoin users at any event that is not specifically Bitcoin-themed. There's a lot of overlap between the Bitcoin and liberty communities. PorcFest draws somewhere around 1000-2000 attendees, a solid quarter of whom have Bitcoin wallets on their mobile devices. The backhaul was a 3G cellular Internet connection, and the local Bitcoin node and network router were hosted on a Raspberry Pi with some Netfilter tricks to restrict connectivity. The net result was that all Bitcoin nodes (lightweight and heavyweight) on the local Wi-Fi network were unable to connect to any Bitcoin nodes except for the local node, which they discovered via DNS. I also had provisions in place to allow outbound connectivity to the API servers for Mycelium, Blockchain, and Coinbase wallets, by feeding the DNS resolver's results in real-time into a whitelisting Netfilter rule utilizing IP Sets. For your amusement, here's the graphic for the banner that I had made to advertise the network at the festival (*chuckle*): http://www.mattwhitlock.com/bitcoin_wifi.png -- 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 -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
On Tuesday, 26 May 2015, at 1:15 am, Peter Todd wrote: On Tue, May 26, 2015 at 12:52:07AM -0400, Matt Whitlock wrote: On Monday, 25 May 2015, at 11:48 pm, Jim Phillips wrote: Do any wallets actually do this yet? Not that I know of, but they do seed their address database via DNS, which you can poison if you control the LAN's DNS resolver. I did this for a Bitcoin-only Wi-Fi network I operated at a remote festival. We had well over a hundred lightweight wallets, all trying to connect to the Bitcoin P2P network over a very bandwidth-constrained Internet link, so I poisoned the DNS and rejected all outbound connection attempts on port 8333, to force all the wallets to connect to a single local full node, which had connectivity to a single remote node over the Internet. Thus, all the lightweight wallets at the festival had Bitcoin network connectivity, but we only needed to backhaul the Bitcoin network's transaction traffic once. Interesting! What festival was this? The Porcupine Freedom Festival (PorcFest) in New Hampshire last summer. I strongly suspect that it's the largest gathering of Bitcoin users at any event that is not specifically Bitcoin-themed. There's a lot of overlap between the Bitcoin and liberty communities. PorcFest draws somewhere around 1000-2000 attendees, a solid quarter of whom have Bitcoin wallets on their mobile devices. The backhaul was a 3G cellular Internet connection, and the local Bitcoin node and network router were hosted on a Raspberry Pi with some Netfilter tricks to restrict connectivity. The net result was that all Bitcoin nodes (lightweight and heavyweight) on the local Wi-Fi network were unable to connect to any Bitcoin nodes except for the local node, which they discovered via DNS. I also had provisions in place to allow outbound connectivity to the API servers for Mycelium, Blockchain, and Coinbase wallets, by feeding the DNS resolver's results in real-time into a whitelisting Netfilter rule utilizing IP Sets. For your amusement, here's the graphic for the banner that I had made to advertise the network at the festival (*chuckle*): http://www.mattwhitlock.com/bitcoin_wifi.png -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
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 b...@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.* -- 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 -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
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 b...@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.* -- 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 -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
On Tuesday, May 26, 2015 4:46:22 AM 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. It doesn't hurt to have a local node or two, though. Might as well to improve propagation, while maintaining the other peers to avoid sybil attacks. Luke -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
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.* -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
Do any wallets actually do this yet? On May 25, 2015 11:37 PM, Matt Whitlock b...@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.* -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
This is true, but the device doesn't know if the LAN it's on is a safe network or a hotel wifi, for example. So there would be a tricky UX there. You'd have to ask the user during set up if this is a trusted LAN or not; or something like that. That may not be an issue though depending on the nature of the product. For example, Chromecast doesn't need any security protections against trolls on the same LAN. I guess it just depends on what you're planning to build. On Mon, May 25, 2015 at 9:56 PM, Matt Whitlock b...@mattwhitlock.name wrote: 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 b...@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.* -- 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 -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
On Tue, May 26, 2015 at 12:52:07AM -0400, Matt Whitlock wrote: On Monday, 25 May 2015, at 11:48 pm, Jim Phillips wrote: Do any wallets actually do this yet? Not that I know of, but they do seed their address database via DNS, which you can poison if you control the LAN's DNS resolver. I did this for a Bitcoin-only Wi-Fi network I operated at a remote festival. We had well over a hundred lightweight wallets, all trying to connect to the Bitcoin P2P network over a very bandwidth-constrained Internet link, so I poisoned the DNS and rejected all outbound connection attempts on port 8333, to force all the wallets to connect to a single local full node, which had connectivity to a single remote node over the Internet. Thus, all the lightweight wallets at the festival had Bitcoin network connectivity, but we only needed to backhaul the Bitcoin network's transaction traffic once. Interesting! What festival was this? -- 'peter'[:-1]@petertodd.org 03ce9f2f90736ab7bd24d29f40346057f9e217b3753896bb signature.asc Description: Digital signature -- 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
[Bitcoin-development] Zero-Conf for Full Node Discovery
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.* -- 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
Re: [Bitcoin-development] Zero-Conf for Full Node Discovery
On Monday, 25 May 2015, at 11:48 pm, Jim Phillips wrote: Do any wallets actually do this yet? Not that I know of, but they do seed their address database via DNS, which you can poison if you control the LAN's DNS resolver. I did this for a Bitcoin-only Wi-Fi network I operated at a remote festival. We had well over a hundred lightweight wallets, all trying to connect to the Bitcoin P2P network over a very bandwidth-constrained Internet link, so I poisoned the DNS and rejected all outbound connection attempts on port 8333, to force all the wallets to connect to a single local full node, which had connectivity to a single remote node over the Internet. Thus, all the lightweight wallets at the festival had Bitcoin network connectivity, but we only needed to backhaul the Bitcoin network's transaction traffic once. On May 25, 2015 11:37 PM, Matt Whitlock b...@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.* -- 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
