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Comcast, le deuxième plus gros provider Internet aux Etats-Unis réalise pour le moment ce qu'ils appelent des "tests" sur le blocage du trafic.En pratique, le provider s'attaque aux réseaux BitTorrent, eDonkey et Gnutella qui sont d'après lui donc des sources d'échanges de fichiers musicaux protégés, de films ou de logiciels. Comcast ne bloque pas complètement ces applications mais en réduit fortement l'intérêt en réduisant leur priorité au maximum.
Comcast est dès lors fortement critiqué quand on sait que BitTorrent est utilisé largement maintenant pour diffuser des distributions Linux et d'autres fichiers volumineux légaux. Concernant BitTorrent justement, le téléchargement n'est pas bloqué, seul l'envoi de donnée sur ce réseau est fortement ralenti voir bloqué ce qui risque à terme de poser problème au réseau P2P.
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Comcast blocks some Internet traffic (232 Clics)
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ovh:
Comcast confirme un blocage de BitTorrent, eDonkey et Gnutella
users_user-179.html:
Comcast confirme un blocage de BitTorrent, eDonkey et Gnutella
Il me semble d'ailleurs que World of Warcraft utilise les ports de bittorrent pour télécharger ses mises à jour. C'est Blizzard et ses pigeons qui vont être heureux...
sphinx:
Comcast confirme un blocage de BitTorrent, eDonkey et Gnutella
super payez pour avoiraccess mais en fait non ca n'avancera pas
c'est quoi la prochaine étape? faire de l'illimiter limité ?
c'est quoi la prochaine étape? faire de l'illimiter limité ?
ovh:
Comcast confirme un blocage de BitTorrent, eDonkey et Gnutella
apn:
Comcast confirme un blocage de BitTorrent, eDonkey et Gnutella
Hello,
En pratique, ils ne jouent pas sur une prioritisation du trafic mais bien sur un dirty-hack au niveau TCP (via des RST envoyees apres quelques secondes aux connections TCP BT) grace a leur PF Sandvine.
Cfr le post de Scott Berkamn envoye le 19/10/2007 sur la ML NANOG:
I agree, they have been doing this in select locations for some time. I
live in Atlanta and have seen this happening for about the 3 months, but I
have friends in the suburbs that have (or had) no issues. I imagine they
have been deploying their traffic shaping in more and more headends. Here
is some actual operational details:
It is reported that Comcast is using an application from Sandvine to
throttle BitTorrent traffic. Sandvine breaks every (seed) connection with
new peers after a few seconds if it's not a Comcast user. This makes it
virtually impossible to seed a file, especially in small swarms without
any Comcast users. Some users report that they can still connect to a few
peers, but most of the Comcast customers see a significant drop in their
upload speed.
The throttling works like this: A few seconds after you connect to someone
in the swarm the Sandvine application sends a peer reset message (RST
flag) and the upload immediately stops. Most vulnerable are users in a
relatively small swarm where you only have a couple of peers you can
upload the file to. Only seeding seems to be prevented, most users are
able to upload to others while the download is still going, but once the
download is finished, the upload speed drops to 0. Some users also report
a significant drop in their download speeds, but this seems to be less
widespread. Worse on private trackers, likely that this is because of the
smaller swarm size
Although BitTorrent protocol encryption seems to work against most forms
of traffic shaping, it doesn't help in this specific case.
Comcast is making no effort to determine if the traffic they are blocking
is legal or not. No one blocks all web traffic because some sites have
illegal content or questionable/undesired material.
Personally I think this is inappropriate behavior for an ISP and I hope it
causes a mass exodus of Comcast customers.
-Scott
A noter que via un hack au niveau IPTables, on arrive a bypasser le probleme. Seul hic au hack, il ne fonctionne que symmetriquement...
http://redhatcat.blogspot.com/2007/09/beating-sandvine-with-linux-iptables.html
En pratique, ils ne jouent pas sur une prioritisation du trafic mais bien sur un dirty-hack au niveau TCP (via des RST envoyees apres quelques secondes aux connections TCP BT) grace a leur PF Sandvine.
Cfr le post de Scott Berkamn envoye le 19/10/2007 sur la ML NANOG:
I agree, they have been doing this in select locations for some time. I
live in Atlanta and have seen this happening for about the 3 months, but I
have friends in the suburbs that have (or had) no issues. I imagine they
have been deploying their traffic shaping in more and more headends. Here
is some actual operational details:
It is reported that Comcast is using an application from Sandvine to
throttle BitTorrent traffic. Sandvine breaks every (seed) connection with
new peers after a few seconds if it's not a Comcast user. This makes it
virtually impossible to seed a file, especially in small swarms without
any Comcast users. Some users report that they can still connect to a few
peers, but most of the Comcast customers see a significant drop in their
upload speed.
The throttling works like this: A few seconds after you connect to someone
in the swarm the Sandvine application sends a peer reset message (RST
flag) and the upload immediately stops. Most vulnerable are users in a
relatively small swarm where you only have a couple of peers you can
upload the file to. Only seeding seems to be prevented, most users are
able to upload to others while the download is still going, but once the
download is finished, the upload speed drops to 0. Some users also report
a significant drop in their download speeds, but this seems to be less
widespread. Worse on private trackers, likely that this is because of the
smaller swarm size
Although BitTorrent protocol encryption seems to work against most forms
of traffic shaping, it doesn't help in this specific case.
Comcast is making no effort to determine if the traffic they are blocking
is legal or not. No one blocks all web traffic because some sites have
illegal content or questionable/undesired material.
Personally I think this is inappropriate behavior for an ISP and I hope it
causes a mass exodus of Comcast customers.
-Scott
A noter que via un hack au niveau IPTables, on arrive a bypasser le probleme. Seul hic au hack, il ne fonctionne que symmetriquement...
http://redhatcat.blogspot.com/2007/09/beating-sandvine-with-linux-iptables.html
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