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From: Alex Kotenko <alexykot@gmail.com>
Date: Wed, 21 May 2014 10:23:08 +0100
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Subject: Re: [Bitcoin-development] DNS seeds unstable
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okay, I've set it up with bind forwarding requests to two dnsseeds running
on separate ports. Though I see a problem with testnet DNS seed itself. It
runs, but somehow it only returns one IP address. Exactly same DNS seeder
looking for mainnet nodes is working fine.

You can reach seeds through
mainnet seed:
dig @node.alexykot.me bitcoin-seed.alexykot.me A
or directly
dig -p 8353 @node.alexykot.me bitcoin-seed.alexykot.me A

testnet seed
dig @node.alexykot.me testnet-seed.alexykot.me A
or directly
dig -p 18353 @node.alexykot.me testnet-seed.alexykot.me A

So what can be the problem with testnet DNS seeder?


Best regards,
Alex Kotenko


2014-05-20 1:50 GMT+01:00 Robert McKay <robert@mckay.com>:

> On Tue, 20 May 2014 01:44:29 +0100, Robert McKay wrote:
> > On Mon, 19 May 2014 19:49:52 -0400, Jeff Garzik wrote:
> >> On Mon, May 19, 2014 at 4:36 PM, Robert McKay <robert@mckay.com>
> >> wrote:
> >>> It should be possible to configure bind as a DNS forwarder.. this
> >>> can
> >>> be done in a zone context.. then you can forward the different
> >>> zones
> >>> to
> >>> different dnsseed daemons running on different non-public IPs or
> >>> two
> >>> different ports on the same IP (or on one single non-public IP
> >>> since
> >>> there's really no reason to expose the dnsseed directly daemon at
> >>> all).
> >>
> >> Quite the opposite.  dnsseed data rotates through a lot of addresses
> >> if available.  Using the bind/zone-xfer system would result in fewer
> >> total addresses going through to the clients, thanks to the addition
> >> of caching levels that the bind/zone-xfer system brings.
> >>
> >> That said, if the choice is between no-service and bind, bind it is
> >> ;p
> >
> > Setting it up as a zone forwarder causes each request to go through
> > to
> > the dnsseed backend for each request.
>
> This stackoverflow describes a similar situation;
>
> http://stackoverflow.com/questions/15338232/how-to-forward-a-subzone
>
> you can additionally specify the port to forward too;
>
> http://www.zytrax.com/books/dns/ch7/queries.html#forwarders
>
> it should be possible to forward to different ports on 127.0.0.1 for
> each dnsseed instance.
>
> Rob
>
>
> ------------------------------------------------------------------------------
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--047d7b66fce7cb880104f9e58d74
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:&#39;cou=
rier new&#39;,monospace;color:rgb(0,51,0)">okay, I&#39;ve set it up with bi=
nd forwarding requests to two dnsseeds running on separate ports. Though I =
see a problem with testnet DNS seed itself. It runs, but somehow it only re=
turns one IP address. Exactly same DNS seeder looking for mainnet nodes is =
working fine.=C2=A0</div>

<div class=3D"gmail_default" style=3D"font-family:&#39;courier new&#39;,mon=
ospace;color:rgb(0,51,0)"><br></div><div class=3D"gmail_default" style=3D"f=
ont-family:&#39;courier new&#39;,monospace;color:rgb(0,51,0)">You can reach=
 seeds through</div>

<div class=3D"gmail_default" style=3D"font-family:&#39;courier new&#39;,mon=
ospace;color:rgb(0,51,0)">mainnet seed:</div><div class=3D"gmail_default" s=
tyle><font color=3D"#003300" face=3D"courier new, monospace">dig @<a href=
=3D"http://node.alexykot.me">node.alexykot.me</a> <a href=3D"http://bitcoin=
-seed.alexykot.me">bitcoin-seed.alexykot.me</a> A</font><br>

</div><div class=3D"gmail_default" style><font color=3D"#003300" face=3D"co=
urier new, monospace">or directly</font></div><div class=3D"gmail_default" =
style><font color=3D"#003300" face=3D"courier new, monospace">dig -p 8353 @=
<a href=3D"http://node.alexykot.me">node.alexykot.me</a> <a href=3D"http://=
bitcoin-seed.alexykot.me">bitcoin-seed.alexykot.me</a> A<br>

</font></div><div class=3D"gmail_default" style><font color=3D"#003300" fac=
e=3D"courier new, monospace"><br></font></div><div class=3D"gmail_default" =
style><font color=3D"#003300" face=3D"courier new, monospace">testnet seed<=
/font></div>

<div class=3D"gmail_default" style><font color=3D"#003300" face=3D"courier =
new, monospace">dig @<a href=3D"http://node.alexykot.me">node.alexykot.me</=
a> <a href=3D"http://testnet-seed.alexykot.me">testnet-seed.alexykot.me</a>=
 A</font><br>

</div><div class=3D"gmail_default" style><div class=3D"gmail_default"><font=
 color=3D"#003300" face=3D"courier new, monospace">or directly</font></div>=
<div><div class=3D"gmail_default"><font color=3D"#003300" face=3D"courier n=
ew, monospace">dig -p 18353 @<a href=3D"http://node.alexykot.me">node.alexy=
kot.me</a> <a href=3D"http://testnet-seed.alexykot.me">testnet-seed.alexyko=
t.me</a> A</font><br>

</div><div class=3D"gmail_default"></div></div></div><div class=3D"gmail_de=
fault" style=3D"font-family:&#39;courier new&#39;,monospace;color:rgb(0,51,=
0)"><br></div><div class=3D"gmail_default" style=3D"font-family:&#39;courie=
r new&#39;,monospace;color:rgb(0,51,0)">

So what can be the problem with testnet DNS seeder?</div><div class=3D"gmai=
l_default" style=3D"font-family:&#39;courier new&#39;,monospace;color:rgb(0=
,51,0)"><br></div><div class=3D"gmail_extra"><br clear=3D"all"><div><div di=
r=3D"ltr">

<span style=3D"color:rgb(0,51,0);font-family:&#39;courier new&#39;,monospac=
e">Best regards,=C2=A0</span><div><div><div style=3D"text-align:left"><font=
 color=3D"#003300" face=3D"&#39;courier new&#39;, monospace" style=3D"text-=
align:-webkit-auto">Alex Kotenko</font></div>

</div></div></div></div>
<br><br><div class=3D"gmail_quote">2014-05-20 1:50 GMT+01:00 Robert McKay <=
span dir=3D"ltr">&lt;<a href=3D"mailto:robert@mckay.com" target=3D"_blank">=
robert@mckay.com</a>&gt;</span>:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(20=
4,204,204);border-left-style:solid;padding-left:1ex">

<div class=3D""><div class=3D"h5">On Tue, 20 May 2014 01:44:29 +0100, Rober=
t McKay wrote:<br>
&gt; On Mon, 19 May 2014 19:49:52 -0400, Jeff Garzik wrote:<br>
&gt;&gt; On Mon, May 19, 2014 at 4:36 PM, Robert McKay &lt;<a href=3D"mailt=
o:robert@mckay.com">robert@mckay.com</a>&gt;<br>
&gt;&gt; wrote:<br>
&gt;&gt;&gt; It should be possible to configure bind as a DNS forwarder.. t=
his<br>
&gt;&gt;&gt; can<br>
&gt;&gt;&gt; be done in a zone context.. then you can forward the different=
<br>
&gt;&gt;&gt; zones<br>
&gt;&gt;&gt; to<br>
&gt;&gt;&gt; different dnsseed daemons running on different non-public IPs =
or<br>
&gt;&gt;&gt; two<br>
&gt;&gt;&gt; different ports on the same IP (or on one single non-public IP=
<br>
&gt;&gt;&gt; since<br>
&gt;&gt;&gt; there&#39;s really no reason to expose the dnsseed directly da=
emon at<br>
&gt;&gt;&gt; all).<br>
&gt;&gt;<br>
&gt;&gt; Quite the opposite. =C2=A0dnsseed data rotates through a lot of ad=
dresses<br>
&gt;&gt; if available. =C2=A0Using the bind/zone-xfer system would result i=
n fewer<br>
&gt;&gt; total addresses going through to the clients, thanks to the additi=
on<br>
&gt;&gt; of caching levels that the bind/zone-xfer system brings.<br>
&gt;&gt;<br>
&gt;&gt; That said, if the choice is between no-service and bind, bind it i=
s<br>
&gt;&gt; ;p<br>
&gt;<br>
&gt; Setting it up as a zone forwarder causes each request to go through<br=
>
&gt; to<br>
&gt; the dnsseed backend for each request.<br>
<br>
</div></div>This stackoverflow describes a similar situation;<br>
<br>
<a href=3D"http://stackoverflow.com/questions/15338232/how-to-forward-a-sub=
zone" target=3D"_blank">http://stackoverflow.com/questions/15338232/how-to-=
forward-a-subzone</a><br>
<br>
you can additionally specify the port to forward too;<br>
<br>
<a href=3D"http://www.zytrax.com/books/dns/ch7/queries.html#forwarders" tar=
get=3D"_blank">http://www.zytrax.com/books/dns/ch7/queries.html#forwarders<=
/a><br>
<br>
it should be possible to forward to different ports on 127.0.0.1 for<br>
each dnsseed instance.<br>
<br>
Rob<br>
<div class=3D""><br>
---------------------------------------------------------------------------=
---<br>
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<br>
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oin-development</a><br>
</blockquote></div><br></div></div>

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