[Bitcoin-development] DOS-Attacks on bitcoin-client?

[Bitcoin-development] DOS-Attacks on bitcoin-client?

[Oliver Egginger]

Hello,

I'm using your bitcoin-qt client (version 0.8.1). Normally everything is 
working pretty fine, but sometimes it seems that other nodes produce an 
enormous amount of traffic. I have not had the time to investigate 
thoroughly yet. I only have briefly viewed with tshark.

So far I have just restarted the client in the hope that it no longer 
connects with the 'evil' node. This usually works quite well.

Is anything about DOS-Attacks known to you?

regards
Oliver

Re: [Bitcoin-development] DOS-Attacks on bitcoin-client?

[Scott Howard]

On Sun, Apr 7, 2013 at 10:43 AM, Oliver Egginger <bitcoin@olivere.de> wrote:
> Hello,
>
> I'm using your bitcoin-qt client (version 0.8.1). Normally everything is
> working pretty fine, but sometimes it seems that other nodes produce an
> enormous amount of traffic. I have not had the time to investigate
> thoroughly yet. I only have briefly viewed with tshark.
>
> So far I have just restarted the client in the hope that it no longer
> connects with the 'evil' node. This usually works quite well.
>
> Is anything about DOS-Attacks known to you?

Many new users have started using the reference client which downloads
the whole blockchain from peers. There currently isn't a throttling
mechanism [1] so it's possible to quickly eat up your bandwidth. You
can try QoS on your router or use the -nolisten command line flag. You
will still relay transactions, just not serve the whole blockchain.

[1] https://github.com/bitcoin/bitcoin/issues/273

Re: [Bitcoin-development] DOS-Attacks on bitcoin-client?

[Oliver Egginger]

Am 07.04.2013 17:22, schrieb Scott Howard:
> Many new users have started using the reference client which downloads
> the whole blockchain from peers.

Yes I have made a clean start because of the the new database structure.

> There currently isn't a throttling
> mechanism [1] so it's possible to quickly eat up your bandwidth. You
> can try QoS on your router or use the -nolisten command line flag. You
> will still relay transactions, just not serve the whole blockchain.

I see. I successfully have downloaded the Blockchain again. Thus, it 
should not occur again now. If it does, I'll be back again. :-)

Thank you for your quick help.

regards
Oliver

Re: [Bitcoin-development] DOS-Attacks on bitcoin-client?

[Jeff Garzik]

BTW, check out the blockchain torrent, as one way of offloading some
of the download bandwidth used from the P2P network:

     Bitcoin blockchain data torrent
     https://bitcointalk.org/index.php?topic=145386.0

-- 
Jeff Garzik
exMULTI, Inc.
jgarzik@exmulti.com