Tools To Test Your ISP For BitTorrent ShenanigansNetwork Neutrality Squad releases beta NNMA tool 03:36PM Friday May 30 2008 by Karl Bodetags: business · software · networking When Comcast was discovered using forged TCP packets to throttle upstream connections, it spawned a flood of new user diagnostic tools aimed at helping users detect whether their ISP was engaged in P2P tomfoolery. First came the EFF's Test Your ISP Project, which walks users through using Wireshark to detect packet forgery. Then came an Azureus plugin, though it could't differentiate between intentional or circumstantial RST resets. Most recently came the Glasnost Project, a more sophisticated test that uses multiple criteria before accusing an ISP of interfering with BitTorrent traffic. The latest tool comes courtesy of the "Network Neutrality Squad," a group created last November to encourage dialog between both sides of the network neutrality debate. According to the project website, the NNSquad Network Measurement Agent (NNMA) is based on the open source "Buster" network management and security program. The new tool was designed to look for and flag a variety of ISP throttling efforts. Keep in mind it just entered beta. "The idea is to *try* to highlight resets that seem out of place in terms of timing, which could be one indicator of an injected reset," Network Neutrality Squad's Lauren Weinstein tells me. "But none of this is 100% of course, there are lots of issues, and this is beta software to be pounded on in the field so we can learn more and build on the platform," he says. I can't vouch for quality since I just installed it myself (I have concluded my Wii is getting unfettered access to the Interwebs!), but perhaps some of you can lend your tweaking and testing help to the project. It looks like they're looking for help in porting the app to other platforms, such as Linux, BSD, Mac, or third-party firmware upgradeable routers (WRT54G, etc.). Related:- WeFi Simplifies Finding Wi-Fi
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  JamesPC
join:2005-10-12 Orange, CA edit: May 30th, @03:20PM
| good for me I guess I am getting good access while running Azureus on my RR connection. Click on your computer for a good look at what your connected to. Some kool things for a beta. | |
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@ssa.gov | Can we block the reset packets? It would be cool if we could detect and block these reset packets! A rule on the firewall! Or maybe an iptables module? | |
|  |  |  |  |   funchords Robb Premium,MVM join:2001-03-11 Hillsboro, OR
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| Re: Can we block the reset packets? said by MxxCon :impossible and idiotic request. RTS packets are an integral part of TCP protocol. blocking them will completely destroy your internet connection. realtime detection methods are inaccurate so any block rule will have HUGE false positive rate. the only accurate way to detect faked RST packets is by comparing traffic from both sides and see if one generated the given RST packet to the other. After a 2-way connection has been established, a Reset (RST) flag should only be generated by the far end if it has crashed. However, all of the forged RST packets generated by Sandvine come in within the same second as a previous genuine packet from the remote host. This being the case, it would be possible to detect a bogus RST packet and react to it differently or discard it. -- Robb Topolski -= funchords.com =- Hillsboro, Oregon HTTP is the new Bandwidth Hog...
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edit: May 31st, @09:03PM
| Re: Can we block the reset packets? said by MxxCon :you know perfectly well With respect, your unnecessary attitude toward others does not promote friendliness. You called the previous poster's idea idiotic and you're being condescending to me.
In this case, you misunderstand how RST works. These are just facts, nobody wins or loses on the strength of their debating skills. It is whatever it is. We both learn about it by being here.
said by MxxCon :if the far end crashed, it wouldn't generate RST. it wouldn't generate anything at all. Right, but when network devices crash, they often reboot. When they come back up with no memory of the pre-crash states, then start receiving TCP packets on a closed port, they send RST in response.
This specific example is explained in RFC 793, Figure 11 (either page 34 or 35).
said by MxxCon :RST would be generated if far end decided to close the existing connection, which can be a valid request. If the far end decided to end the existing connection, FIN should be sent, not RST.
Anything is possible (there's an older Microsoft webserver that sends RST to kill the FIN's TIME_WAIT interval), but these exceptions are rare and usually pointed out as mistaken implementations.
said by MxxCon :some bittorrent clients want to connect only to seeds, so the moment they see it's not a seed, they will abort such connection generating RST. blocking such packets will break your application As said above, FIN not RST, is what should be sent. FIN completes the connection gracefully. RST can cause the loss of sent-but-unacknowledged data.
You can see this using Wireshark. -- Robb Topolski -= funchords.com =- Hillsboro, Oregon HTTP is the new Bandwidth Hog...
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@ssa.gov
| Re: Can we block the reset packets? Well, looking at the RFC it seems like we should not receive a RST while the connection is in the ESTABLISHED STATE. So, maybe we can drop RST if ESTABLISHED?
Anyone know how to make iptables do that?
And I assume I am not 100% correct!  It just can't be that easy. | |
|  |  |  |  |  |  |   funchords Robb Premium,MVM join:2001-03-11 Hillsboro, OR
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| Re: Can we block the reset packets? said by Hehe :Well, looking at the RFC it seems like we should not receive a RST while the connection is in the ESTABLISHED STATE. So, maybe we can drop RST if ESTABLISHED? Anyone know how to make iptables do that? And I assume I am not 100% correct!  It just can't be that easy. RFC 793, Figure 11 would happen with one end in the Established state, thinking it was in a full-open connection when it actually is only in a half-open connection due to the remote host's reboot. -- Robb Topolski -= funchords.com =- Hillsboro, Oregon HTTP is the new Bandwidth Hog...
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join:2001-12-11 Renton, WA clubs: | Wide open on Qwest It's showing everything wide open on my new 12mb Qwest line. I don't feel like plugging comcast back in to test it. | |
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