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Author Topic: Time to download the block chain  (Read 2715 times)
MysteryMiner
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October 28, 2011, 02:14:11 AM
 #21

DO NOT USE UPnP!!!!!!

in some routers, they can be completely reconfigured by sending only 1 packet. this can be solved by simply turning off UPnP. id also advise turning off all other remote and automatic configuration systems, they are only security holes.
In my systems I configure ports manually, and no UPnP. For most users who are clueless about networking, the router with UPnP is still more secure than going directly to internet. It's like going naked on street when gay pride is marching nearby.
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If you have malicous software on the inside of your firewall/router then you have larger problems then UPnP.
Yes, the golden rule. It's either completely clean and safe, or you are owned. And Yes, most routers allow changing UPnP rules only from LAN side. Still there are routers with badly written firmware or running on default passwords and with WAN management acess enabled.

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DeathAndTaxes
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October 28, 2011, 02:14:37 AM
 #22


also, not all routers allow the user to just disable UPnP on wan or lan individually.

Of course they don't because UPnP only works from LAN side.  I don't use it but I find the hysteria over UPnp to be amusing.  For it to present a risk you would already need malicous software inside the network.  If that is true you likely are fucked UPnP or not.  The very people who are the most likely to allow that to happen (look an exe from my friend... click) have no chance to configuring a router manually anyways.  So without UPnp they are likely going to turn off all firewalls, put their PC on DMZ, or plug directly into cable modem which are far worse than enabling UPnP.   Also it isn't like lack of UPnP makes the network invulnerable to attack.

  

MysteryMiner
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October 28, 2011, 02:18:29 AM
 #23

There is a lot of misguided sysadmins who think UPnP is malicius and vector of vulnerability. In reality UPnP can only be used to help attacker, when he got the payload already in the LAN side and the malware is run. It's game-over scenario anyway.

One more thing - with properly written UPnP software, the opened port rule is closed once the application using it is closed. With permanently forwarded port the port is forwarded at all times.

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jetmine
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October 28, 2011, 04:23:12 PM
 #24

Of course they don't because UPnP only works from LAN side.  I don't use it but I find the hysteria over UPnp to be amusing.  For it to present a risk you would already need malicous software inside the network.

You should read the FAQ on the umap pentest tool: http://www.toor.do/
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Reverse engineer from time to time


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October 31, 2011, 12:02:52 AM
 #25

No i downloaded an archive and waited only 2-3 minutes.

http://bitcoin.bluematt.me/bitcoin-nightly/blockchain-nightly/

I am not going to download the block chain from some random url.
Whatever...BlueMatt is a developer working on Bitcoin and this can be verified on freenode @ #bitcoin-dev

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payb.tc
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October 31, 2011, 12:19:19 AM
 #26

Download speed of the blockchain is ridicolous and make no sense.

It's a P2P network where there is a 900MB file and pretty much everyone is a seeder. On bittorrent that mean FULL STEAM AHEAD! DOWNLOAD AT FULL SPEED!
It should take like 5 or 10 minutes.

Instead here it take 12+hours.......

a bittorrent download is done completely out of order and the client just continually fills in the blanks.

a blockchain download is done in order and only after block 123 is downloaded will it download block 124*

in addition, file compression would be far more efficient when compressing the entire chain as one big file (for possible deployment on bittorrent), whereas because bitcoin downloads each block separately, the compression over the whole chain is less efficient.

*could be wrong, please get a second opinion.
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October 31, 2011, 12:24:16 AM
 #27

There's no reason each release couldn't come with a torrent file with a recent snapshot of the blockchain.

https://www.bitcoin.org/bitcoin.pdf
While no idea is perfect, some ideas are useful.
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