[Bitcoin-development] DNS seeds returning gone peers

[Rick Wesson]

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 at 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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