Subject: Re: [Bitcoin-development] DNS seeds unstable

From: Andreas Schildbach <[email-masked]>
Date: Wed, 21 May 2014 13:26:21 +0200

Hmmm, not for me:

$ nslookup bitcoin-seed.alexykot.me
Server:		127.0.1.1
Address:	127.0.1.1#53

** server can't find bitcoin-seed.alexykot.me: SERVFAIL

$ nslookup testnet-seed.alexykot.me
Server:		127.0.1.1
Address:	127.0.1.1#53

** server can't find testnet-seed.alexykot.me: SERVFAIL

Can you look up in the logfile what requests I just made?

On 05/21/2014 01:10 PM, Alex Kotenko wrote:
> Misunderstanding. Both seeds are available on port 53 via BIND forwarding.
> Just also each DNS seed is available separately on it's own port.
> 
> 
> Best regards, 
> Alex Kotenko
> 
> 
> 2014-05-21 12:03 GMT+01:00 Andreas Schildbach <[email-masked]
> <mailto:[email-masked]>>:
> 
>     Great, thanks for this contribution!
> 
>     Do you plan to have your seeds reachable on port 53 eventually?
>     Currently bitcoinj cannot deal with nonstandard ports I think.
> 
> 
>     On 05/21/2014 11:23 AM, Alex Kotenko wrote:
>     > 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 <http://node.alexykot.me>
>     <http://node.alexykot.me> bitcoin-seed.alexykot.me
>     <http://bitcoin-seed.alexykot.me>
>     > <http://bitcoin-seed.alexykot.me> A
>     > or directly
>     > dig -p 8353 @node.alexykot.me <http://node.alexykot.me>
>     <http://node.alexykot.me>
>     > bitcoin-seed.alexykot.me <http://bitcoin-seed.alexykot.me>
>     <http://bitcoin-seed.alexykot.me> A
>     >
>     > testnet seed
>     > dig @node.alexykot.me <http://node.alexykot.me>
>     <http://node.alexykot.me> testnet-seed.alexykot.me
>     <http://testnet-seed.alexykot.me>
>     > <http://testnet-seed.alexykot.me> A
>     > or directly
>     > dig -p 18353 @node.alexykot.me <http://node.alexykot.me>
>     <http://node.alexykot.me>
>     > testnet-seed.alexykot.me <http://testnet-seed.alexykot.me>
>     <http://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 <[email-masked]
>     <mailto:[email-masked]>
>     > <mailto:[email-masked] <mailto:[email-masked]>>>:
>     >
>     >     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
>     <[email-masked] <mailto:[email-masked]>
>     >     <mailto:[email-masked] <mailto:[email-masked]>>>
>     >     >> 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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