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Subject: Re: [Bitcoin-development] DNS seeds unstable
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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> bitcoin-seed.alexykot.me
> <http://bitcoin-seed.alexykot.me> A
> or directly
> dig -p 8353 @node.alexykot.me <http://node.alexykot.me>
> bitcoin-seed.alexykot.me <http://bitcoin-seed.alexykot.me> A
>
> testnet seed
> dig @node.alexykot.me <http://node.alexykot.me> testnet-seed.alexykot.me
> <http://testnet-seed.alexykot.me> A
> or directly
> dig -p 18353 @node.alexykot.me <http://node.alexykot.me>
> 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 <robert@mckay.com
> <mailto: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
> <mailto: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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