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From: Mike Hearn <mike@plan99.net>
To: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: [Bitcoin-development] DNS seeds returning gone peers
Date: Wed, 3 Aug 2011 12:04:11 +0200	[thread overview]
Message-ID: <CANEZrP1-BaNmKhSPXSe2sjH0-DPm62_=OQ_S6aCT3-nLdFLLGA@mail.gmail.com> (raw)

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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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             reply	other threads:[~2011-08-03 10:04 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-03 10:04 Mike Hearn [this message]
2011-08-03 11:38 ` [Bitcoin-development] DNS seeds returning gone peers Matt Corallo
2011-08-03 12:00   ` Mike Hearn
2011-08-03 12:15     ` Johannes Henninger
2011-08-03 12:17       ` Mike Hearn
2011-08-03 12:27   ` Caleb James DeLisle
2011-08-03 12:40     ` Mike Hearn
2011-08-03 14:00 ` Rick Wesson
2011-08-03 14:10   ` Mike Hearn
2011-08-03 14:18     ` Rick Wesson
2011-08-03 14:28       ` Douglas Huff
2011-08-03 14:39         ` Mike Hearn
2011-08-03 14:48           ` Gregory Maxwell
2011-08-03 15:32             ` Matt Corallo
2011-08-03 14:37       ` Christian Decker

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