Cable Modems Bittorrent shaping even with encryption

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Subject Author Date
Bittorrent shaping even with encryption Seguros Catatumbo 11-12-06
Posted by Seguros Catatumbo on November 12, 2006, 9:04 pm
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Hi, i want to know if this is possible.

Our isp monitors our bandwidth use, and if one exceeds 7GB in a month,
they change your subnet to a 200.8.x.x/23

Bittorrent doesn't work, when it kind of works speed is less than
1kb/s, and connections get reset randomly, bringing irc, msn and java
chats down.

However, http downloads work at full speed.

My question is, how do they know i am using bittorrent, if i am using
encryption? Are they just looking for HTTP headers, and failing to find
them, think i am using torrents?


Posted by Gene S. Berkowitz on November 13, 2006, 12:15 am
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seguroscatatumbo@gmail.com says...
> Hi, i want to know if this is possible.
>
> Our isp monitors our bandwidth use, and if one exceeds 7GB in a month,
> they change your subnet to a 200.8.x.x/23
>
> Bittorrent doesn't work, when it kind of works speed is less than
> 1kb/s, and connections get reset randomly, bringing irc, msn and java
> chats down.
>
> However, http downloads work at full speed.
>
> My question is, how do they know i am using bittorrent, if i am using
> encryption? Are they just looking for HTTP headers, and failing to find
> them, think i am using torrents?

Because Bittorrent uses other ports besides port 80, the default for
http. Encryption only covers the payload of a packet, not its source,
destination, and other useful details.

If you want more bandwidth, pay for it.

--Gene

Posted by Seguros Catatumbo on November 13, 2006, 7:50 pm
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> If you want more bandwidth, pay for it.

I'm paying for an "unlimited" plan. There is no mention even in the
small letter that if i exceed certaint amount, i will be capped.

In countries like yours, you would be able to sue.
In countries like mine, you are stuck.


Posted by BR on November 13, 2006, 10:23 pm
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On Mon, 13 Nov 2006 16:50:15 -0800, Seguros Catatumbo wrote:


>> If you want more bandwidth, pay for it.
>
> I'm paying for an "unlimited" plan. There is no mention even in the
> small letter that if i exceed certaint amount, i will be capped.
>
> In countries like yours, you would be able to sue. In countries like
> mine, you are stuck.

Fortunately your country doesn't have a different definition of "capped".

Posted by Quaoar on November 13, 2006, 7:48 pm
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Seguros Catatumbo wrote:
> Hi, i want to know if this is possible.
>
> Our isp monitors our bandwidth use, and if one exceeds 7GB in a month,
> they change your subnet to a 200.8.x.x/23
>
> Bittorrent doesn't work, when it kind of works speed is less than
> 1kb/s, and connections get reset randomly, bringing irc, msn and java
> chats down.
>
> However, http downloads work at full speed.
>
> My question is, how do they know i am using bittorrent, if i am using
> encryption? Are they just looking for HTTP headers, and failing to find
> them, think i am using torrents?
>

From whatever BT client you use, change the default port from 6881 to
some arbitrary port like 16721. Then, enable encrypted downloads only.
This might help.

Q

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