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Is it possible to block BTC related traffic in a firewall?
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Topic: Is it possible to block BTC related traffic in a firewall? (Read 2436 times)
johnyj
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Is it possible to block BTC related traffic in a firewall?
February 12, 2013, 10:44:41 PM
#1
If I block port 8333, will it still work?
Or simply, can I use port 80 in a node?
Why bitcoin will appreciate forever:
https://bitcointalk.org/index.php?topic=277275.msg3244038#msg3244038
Schleicher
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Re: Is it possible to block BTC related traffic in a firewall?
February 13, 2013, 01:42:02 AM
#2
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.
https://git.io/vFQv6
celkaris
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Re: Is it possible to block BTC related traffic in a firewall?
February 13, 2013, 02:44:01 AM
#3
layer 7 filtering :
http://l7-filter.sourceforge.net/
johnyj
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Re: Is it possible to block BTC related traffic in a firewall?
February 13, 2013, 03:09:16 AM
#4
Quote from: Schleicher on February 13, 2013, 01:42:02 AM
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?
Why bitcoin will appreciate forever:
https://bitcointalk.org/index.php?topic=277275.msg3244038#msg3244038
Schleicher
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Re: Is it possible to block BTC related traffic in a firewall?
February 13, 2013, 05:16:34 AM
#5
Quote from: johnyj on February 13, 2013, 03:09:16 AM
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.
https://git.io/vFQv6
Buffer Overflow
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Re: Is it possible to block BTC related traffic in a firewall?
February 20, 2013, 07:47:18 PM
#6
Quote from: johnyj on February 12, 2013, 10:44:41 PM
If I block port 8333, will it still work?
Depends. Are you blocking the incoming or outgoing packets?
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tpantlik
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Re: Is it possible to block BTC related traffic in a firewall?
February 20, 2013, 07:54:59 PM
#7
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!!
Buffer Overflow
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Re: Is it possible to block BTC related traffic in a firewall?
February 20, 2013, 10:59:31 PM
#8
Quote from: johnyj on February 13, 2013, 03:09:16 AM
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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0x702ABE1B3213C7CC4BFB63A70C921A615B4A1D72
johnyj
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Re: Is it possible to block BTC related traffic in a firewall?
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
Why bitcoin will appreciate forever:
https://bitcointalk.org/index.php?topic=277275.msg3244038#msg3244038
gmaxwell
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Re: Is it possible to block BTC related traffic in a firewall?
February 21, 2013, 01:29:13 AM
#10
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.
celkaris
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Re: Is it possible to block BTC related traffic in a firewall?
February 21, 2013, 09:32:21 AM
#11
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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