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Date: Wed, 3 Aug 2011 07:18:26 -0700
Message-ID: <CAJ1JLttf+h5J8ehmx1j5P1GiGYAUiLN=fGjSV_dLoy72XQohfA@mail.gmail.com>
From: Rick Wesson <rick@support-intelligence.com>
To: Mike Hearn <mike@plan99.net>
Content-Type: multipart/alternative; boundary=000e0cd48ba2aa2d1804a99a891d
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] DNS seeds returning gone peers
Precedence: list

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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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>>> Get tools for creating Super Apps. See the latest technologies.
>>> Sessions, hands-on labs, demos & much more. Register early & save!
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>>>
>>>
>>
>

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Starting from bitcoinj, I have plenty of ways to publish DNS. Why sort them=
 by version? Ordering from highest to lowest?=A0<div><br></div><div>how abo=
ut publishing addresses under <a href=3D"http://version.example.com">versio=
n.example.com</a> if you version has a perfrence?</div>
<div><br></div><div>-rick</div><div><br><br><div class=3D"gmail_quote">On W=
ed, Aug 3, 2011 at 7:10 AM, Mike Hearn <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:mike@plan99.net">mike@plan99.net</a>&gt;</span> wrote:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex;">
There&#39;s no project currently :-)=A0<div><br></div><div>Starting from Ma=
tts code is probably the way to go. It&#39;s written in PHP. Alternatively,=
 you could write a Java app for it, as there are drop-in DNS serving librar=
ies you could link with BitCoinJ+sqlite. It probably wouldn&#39;t be that h=
ard. You&#39;d want to sort nodes by version, how long they&#39;ve been obs=
erved to exist, the last polling time, etc.</div>
<div><div></div><div class=3D"h5">
<div><br><div class=3D"gmail_quote">On Wed, Aug 3, 2011 at 4:00 PM, Rick We=
sson <span dir=3D"ltr">&lt;<a href=3D"mailto:rick@support-intelligence.com"=
 target=3D"_blank">rick@support-intelligence.com</a>&gt;</span> wrote:<br><=
blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px=
 #ccc solid;padding-left:1ex">

Mike,<div><br></div><div>I think I can=A0contribute=A0to your DNS seeding p=
roject. Could you help define long-lived peers?=A0</div><div><br></div><div=
>-rick</div><div><br><br><div class=3D"gmail_quote"><div><div></div><div>
On Wed, Aug 3, 2011 at 3:04 AM, Mike Hearn <span dir=3D"ltr">&lt;<a href=3D=
"mailto:mike@plan99.net" target=3D"_blank">mike@plan99.net</a>&gt;</span> w=
rote:<br>
</div></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex"><div><div></div><div>This is exp=
ected to happen from time to time of course as it&#39;s inherently racy, bu=
t there are a <i>lot</i>=A0of bad nodes appearing in the DNS seeds.<div>


<br></div><div><div><div><font face=3D"&#39;courier new&#39;, monospace">$ =
nmap -oG /tmp/x -p 8333 `dig +short <a href=3D"http://bitseed.bitcoin.org.u=
k" target=3D"_blank">bitseed.bitcoin.org.uk</a> <a href=3D"http://dnsseed.b=
luematt.me" target=3D"_blank">dnsseed.bluematt.me</a> <a href=3D"http://bit=
seed.xf2.org" target=3D"_blank">bitseed.xf2.org</a>`</font></div>



</div></div><div><font face=3D"&#39;courier new&#39;, monospace">...</font>=
</div><div><div><font face=3D"&#39;courier new&#39;, monospace">Nmap done: =
48 IP addresses (25 hosts up) scanned in 9.80 seconds</font></div>
</div><div><font face=3D"&#39;courier new&#39;, monospace"><br></font></div=
><div><font face=3D"&#39;courier new&#39;, monospace">$ grep -c &#39;closed=
&#39; /tmp/x</font></div>
<div><font face=3D"&#39;courier new&#39;, monospace">6<br></font><br></div>=
<div>So of 48 IPs returned only 19 are actually usable. This is slowing dow=
n peer bringup for the Android apps, which don&#39;t currently save the add=
resses of last-used peers (yes, I know we should fix this).</div>



<div><br></div><div>I was talking to a friend a few days ago about Bitcoin,=
 he seemed interested. I&#39;m hoping he might take on DNS seeding as a pro=
ject. 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 th=
ing.</div>



<br></div></div><div>------------------------------------------------------=
------------------------<br>
BlackBerry&amp;reg; DevCon Americas, Oct. 18-20, San Francisco, CA<br>
The must-attend event for mobile developers. Connect with experts.<br>
Get tools for creating Super Apps. See the latest technologies.<br>
Sessions, hands-on labs, demos &amp; much more. Register early &amp; save!<=
br>
<a href=3D"http://p.sf.net/sfu/rim-blackberry-1" target=3D"_blank">http://p=
.sf.net/sfu/rim-blackberry-1</a><br>_______________________________________=
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nk">Bitcoin-development@lists.sourceforge.net</a><br>
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" target=3D"_blank">https://lists.sourceforge.net/lists/listinfo/bitcoin-de=
velopment</a><br>
<br></div></blockquote></div><br></div>
</blockquote></div><br></div>
</div></div></blockquote></div><br></div>

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