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
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