I'm curious whether my Non-Blocking network stack (BitDroid) isn't better suited for detecting and tracking available peers. I have implemented several benchmarks, including a simple peer counter listener, which would have to be adapted to fit the DNS needs (open and check if a real peer is listening). Being non-blocking it can open several hundreds of connections to check reachability of the peers and at the same time keep a pool of peers connected to listen for address broadcasts, with minimal overhead (single thread, close to no context switches).

Just an idea :-)

Regards,
Chris

On Wed, Aug 3, 2011 at 4:18 PM, Rick Wesson <rick@support-intelligence.com> wrote:
Starting from bitcoinj, I have plenty of ways to publish DNS. Why sort them by version? Ordering from highest to lowest? 

how about publishing addresses under version.example.com if you version has a perfrence?

-rick


On Wed, Aug 3, 2011 at 7:10 AM, Mike Hearn <mike@plan99.net> wrote:
There's no project currently :-) 

Starting from Matts code is probably the way to go. It's written in PHP. Alternatively, you could write a Java app for it, as there are drop-in DNS serving libraries you could link with BitCoinJ+sqlite. It probably wouldn't be that hard. You'd want to sort nodes by version, how long they've been observed to exist, the last polling time, etc.

On Wed, Aug 3, 2011 at 4:00 PM, Rick Wesson <rick@support-intelligence.com> wrote:
Mike,

I think I can contribute to your DNS seeding project. Could you help define long-lived peers? 

-rick


On Wed, Aug 3, 2011 at 3:04 AM, Mike Hearn <mike@plan99.net> wrote:
This is expected to happen from time to time of course as it's inherently racy, but there are a lot of bad nodes appearing in the DNS seeds.

$ nmap -oG /tmp/x -p 8333 `dig +short bitseed.bitcoin.org.uk dnsseed.bluematt.me bitseed.xf2.org`
...
Nmap done: 48 IP addresses (25 hosts up) scanned in 9.80 seconds

$ grep -c 'closed' /tmp/x
6

So of 48 IPs returned only 19 are actually usable. This is slowing down peer bringup for the Android apps, which don't currently save the addresses of last-used peers (yes, I know we should fix this).

I was talking to a friend a few days ago about Bitcoin, he seemed interested. I'm hoping he might take on DNS seeding as a project. A custom DNS server that watches the network to find long-lived peers that run the latest version would be helpful for resolving this kind of thing.

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