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Author Topic: Is it possible to block BTC related traffic in a firewall?  (Read 2345 times)
johnyj
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February 12, 2013, 10:44:41 PM
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If I block port 8333, will it still work?

Or simply, can I use port 80 in a node?

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Schleicher
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February 13, 2013, 01:42:02 AM
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It depends on how restrictive the firewall is.
Usually it doesn't matter what port your client uses.
If port 80 is not being blocked then you only need someone running a client on port 80 to connect to it.

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February 13, 2013, 02:44:01 AM
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layer 7 filtering : http://l7-filter.sourceforge.net/
johnyj
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February 13, 2013, 03:09:16 AM
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It depends on how restrictive the firewall is.
Usually it doesn't matter what port your client uses.
If port 80 is not being blocked then you only need someone running a client on port 80 to connect to it.

If a client is running on port 80, will it be able to connect to rest of the network?

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February 13, 2013, 05:16:34 AM
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If a client is running on port 80, will it be able to connect to rest of the network?
It's the other way around.
It will only connect when someone else has a client running on port 80.
That's assuming the firewall is not being totally paranoid.

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February 20, 2013, 07:47:18 PM
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If I block port 8333, will it still work?

Depends. Are you blocking the incoming or outgoing packets?

tpantlik
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February 20, 2013, 07:54:59 PM
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You can use tor to bypass firewall blocking bitcoin port. And even if it is actively trying to block tor you can still try to connect with tor bridge.

Gods sent us a powerful tool - cryptography - to fight with those who are trying to exploit us. USE IT!!
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February 20, 2013, 10:59:31 PM
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If a client is running on port 80, will it be able to connect to rest of the network?

Ports 0 - 1023 are special ports that would require your Bitcoin client to be running at elevated root privilege. (Bad idea.)

Bitcoin won't bind to port 80 as a normal user.

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February 21, 2013, 12:35:10 AM
 #9

Thanks, just want to evaluate the risk of a block at major back-bone switch. Google and youtube are totally blocked in main land china, so I suppose it is not very difficult for government to do such a block if they decided to do so

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February 21, 2013, 01:29:13 AM
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Bitcoin isn't an anti-censorship system— it's trivial to block.

If you're concerned about bitcoin being blocked setup and maintain a Bitcoin node on a tor hidden service (see doc/Tor.txt), we could use some more of them.
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February 21, 2013, 09:32:21 AM
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if your problem is about censorship, you oculd have a look at "BoF" project, haven't tried it, but it may help.

Bof = "Bitcoin over Freenet" ; you probably already heard about Freenet [ http://freenetproject.org/ ]  if you live in china & are concerned by censorship.

Can't link to USK here, but you'll find the link from most index freesites.
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