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Date: Wed, 3 Aug 2011 16:37:12 +0200
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Subject: Re: [Bitcoin-development] DNS seeds returning gone peers
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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.
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA
>>>> The must-attend event for mobile developers. Connect with experts.
>>>> Get tools for creating Super Apps. See the latest technologies.
>>>> Sessions, hands-on labs, demos & much more. Register early & save!
>>>> http://p.sf.net/sfu/rim-blackberry-1
>>>> _______________________________________________
>>>> Bitcoin-development mailing list
>>>> Bitcoin-development@lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>>>>
>>>>
>>>
>>
>
>
> ------------------------------------------------------------------------------
> BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA
> The must-attend event for mobile developers. Connect with experts.
> Get tools for creating Super Apps. See the latest technologies.
> Sessions, hands-on labs, demos & much more. Register early & save!
> http://p.sf.net/sfu/rim-blackberry-1
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> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>
--00504502cc3423e34904a99acff4
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
I'm curious whether my Non-Blocking network stack (BitDroid) isn't =
better suited for detecting and tracking available peers. I have implemente=
d 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 peer=
s connected to listen for address broadcasts, with minimal overhead (single=
thread, close to no context switches).<br>
<br>Just an idea :-)<br><br>Regards,<br>Chris<br><br><div class=3D"gmail_qu=
ote">On Wed, Aug 3, 2011 at 4:18 PM, Rick Wesson <span dir=3D"ltr"><<a h=
ref=3D"mailto:rick@support-intelligence.com">rick@support-intelligence.com<=
/a>></span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex;">Starting from bitcoinj, I have plenty of wa=
ys to publish DNS. Why sort them by version? Ordering from highest to lowes=
t?=A0<div>
<br></div><div>how about publishing addresses under <a href=3D"http://versi=
on.example.com" target=3D"_blank">version.example.com</a> if you version ha=
s a perfrence?</div>
<div><br></div><font color=3D"#888888"><div>-rick</div></font><div><div></d=
iv><div class=3D"h5"><div><br><br><div class=3D"gmail_quote">On Wed, Aug 3,=
2011 at 7:10 AM, Mike Hearn <span dir=3D"ltr"><<a href=3D"mailto:mike@p=
lan99.net" target=3D"_blank">mike@plan99.net</a>></span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
There's no project currently :-)=A0<div><br></div><div>Starting from Ma=
tts 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 librar=
ies you could link with BitCoinJ+sqlite. It probably wouldn't be that h=
ard. You'd want to sort nodes by version, how long they've been obs=
erved to exist, the last polling time, etc.</div>
<div><div></div><div>
<div><br><div class=3D"gmail_quote">On Wed, Aug 3, 2011 at 4:00 PM, Rick We=
sson <span dir=3D"ltr"><<a href=3D"mailto:rick@support-intelligence.com"=
target=3D"_blank">rick@support-intelligence.com</a>></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"><<a href=3D=
"mailto:mike@plan99.net" target=3D"_blank">mike@plan99.net</a>></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'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"'courier new', 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"'courier new', monospace">...</font>=
</div><div><div><font face=3D"'courier new', monospace">Nmap done: =
48 IP addresses (25 hosts up) scanned in 9.80 seconds</font></div>
</div><div><font face=3D"'courier new', monospace"><br></font></div=
><div><font face=3D"'courier new', monospace">$ grep -c 'closed=
' /tmp/x</font></div>
<div><font face=3D"'courier new', 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'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'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&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 & much more. Register early & 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>_______________________________________=
________<br>
Bitcoin-development mailing list<br>
<a href=3D"mailto:Bitcoin-development@lists.sourceforge.net" target=3D"_bla=
nk">Bitcoin-development@lists.sourceforge.net</a><br>
<a href=3D"https://lists.sourceforge.net/lists/listinfo/bitcoin-development=
" 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>
</div></div><br>-----------------------------------------------------------=
-------------------<br>
BlackBerry&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 & much more. Register early & 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>_______________________________________=
________<br>
Bitcoin-development mailing list<br>
<a href=3D"mailto:Bitcoin-development@lists.sourceforge.net">Bitcoin-develo=
pment@lists.sourceforge.net</a><br>
<a href=3D"https://lists.sourceforge.net/lists/listinfo/bitcoin-development=
" target=3D"_blank">https://lists.sourceforge.net/lists/listinfo/bitcoin-de=
velopment</a><br>
<br></blockquote></div><br>
--00504502cc3423e34904a99acff4--
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