Comcast Suit: Was Blocking P2P Worth the Final Cost?


By Art Reisman
CTO of APconnections
Makers of the plug-and-play bandwidth control and traffic shaping appliance NetEqualizer

Art Reisman CTO www.netequalizer.com

Comcast recently settled a class action suit in the state of Pennsylvania regarding its practice of selectively blocking of P2P.  So far, the first case was settled for 16 million dollars with more cases on the docket yet to come. To recap, Comcast and other large ISPs invested in technology to thwart P2P, denied involvment when first accused, got spanked by the FCC,  and now Comcast is looking to settle various class action suits.

When Comcast’s practices were established, P2P usage was sky-rocketing with no end in sight and the need to block some of it was required in order to preserve reasonable speeds for all users. Given that there was no specific law or ruling on the book, it seemed like mucking with P2P to alleviate gridlock was a rational business decision. This decision made even more sense considering that DSL providers were stealing disgruntled customers. With this said, Comcast wasn’t alone in the practice — all of the larger providers were doing it, throttling P2P to some extent to ensure good response times for all of their customers.

Yet, with the lawsuits mounting, it appears on face value that things backfired a bit for Comcast. Or did they?

We can work out some very rough estimates as the final cost trade-off. Here goes:

I am going to guess that before this plays out completely, settlements will run close to $50 million or more. To put that in perspective, Comcast shows a 2008 profit of close to $3 billion. Therefore, $50 million is hardly a dent to their stock holders. But, in order to play this out, we must ask what the ramifications would have been to not blocking P2P back when all of this began and P2P was a more serious bandwidth threat (Today, while P2P has declined, YouTube and online video are now the primary bandwidth hogs).

We’ll start with the customer. The cost of getting a new customer is usually calculated at around 6 months of service or approximately $300. So, to make things simple, we’ll assume the net cost of a losing a customer is roughly $300. In addition, there are also the support costs related to congested networks that can easily run $300 per customer incident.

The other more subtle cost of P2P is that the methods used to deter P2P traffic were designed to keep traffic on the Comcast network. You see, ISPs pay for exchanging data when they hand off to other networks, and by limiting the amount of data exchanged, they can save money. I did some cursory research on the costs involved with exchanging data and did not come up with anything concrete, so I’ll assume a P2P customer can cost you $5 per month.

So, lets put the numbers together to get an idea of how much potential financial damage P2P was causing back in 2007 (again, I must qualify that these are based on estimates and not fact. Comments and corrections are welcome).

  • Comcast had approximately 15 million broadband customers in 2008.
  • If 1 in 100 were heavy P2P users, the exchange cost would be $7.5 million per month in exchange costs.
  • Net lost customers to a competitor might be 1 in 500 a month. That would run $9 million a month.
  • Support calls due to preventable congestion might run another 1 out of 500 customers or $9 million a month.

So, very conservatively for 2007 and 2008, incremental costs related to unmitigated P2P could have easily run a total of $600 million right off the bottom line.

Therefore, while these calculations are approximations, in retrospect it was likely financially well worth the risk for Comcast to mitigate the effects of unchecked P2P. Of course, the public relations costs are much harder to quantify.

Bandwidth Quota Prophecy plays out at Comcast.


A couple of years ago we pointed out how implementing a metered usage policy could create additional overhead.  Here is an excerpt:

To date, it has not been a good idea to flaunt a quota policy and many ISPs do their best to keep it under the radar. In addition, enforcing and demonstrating a quota-based system to customers will add overhead costs and also create more customer calls and complaints. It will require more sophistication in billing and the ability for customers to view their accounts in real time. Some consumers will demand this, and rightly so.

Today two years after Comcast started a fair use policy based on Quota’s they announced a new tool for customers that allows customers to see their usage and  gives them a warning before being cut off.  I suspect the new tool is designed to alleviate the issues we mention in our paragraph above.

NetEqualizer customers can usually accomplish bandwidth reductions fairly without the complexity of quota systems , but in a pinch we also have a quota system on our equipment.

Results From Comcast’s New Bandwidth Shaping Approach Support Long-Time NetEqualizer Strategy


This week, a DSL Reports article explored the favorable customer response to the most recent changes in Comcast’s bandwidth shaping strategy. The article states:

“Last month we explored how Comcast and Sandvine’s network management technology continues to evolve. Unlike Comcast’s last system, which throttled upstream traffic for all users regardless of consumption, this new system identifies customers and throttles back consumption only if they’re on a congested node — and they’re a particular reason why. Even then, we haven’t seen complaints from users in our Comcast forum, which is a very good sign.”

Several months ago, we documented the similarities and differences between Comcast’s network management techniques and those of NetEqualizer. If you go back and read our older article, it sounds like these latest changes address many of the issues we raised and inch Comcast’s approach even closer to that of NetEqualizer. The key here is that, like NetEqualizer, they now only hit the users that are specifically breaking the camels back, and as the author points out, there are no complaints.

Although nobody from Comcast has ever conferred with us on our technology, we believe this new more specific shaping is very close to what we have been doing for years, and with similar results — no complaints.

To read the full DSL Reports article, click here.

Four Reasons Why Peer-to-Peer File Sharing Is Declining in 2009


By Art Reisman

CTO of APconnections, makers of the plug-and-play bandwidth control and traffic shaping appliance NetEqualizer

Art Reisman CTO www.netequalizer.com

I recently returned from a regional NetEqualizer tech seminar with attendees from Western Michigan University, Eastern Michigan University and a few regional ISPs.  While having a live look at Eastern Michigan’s p2p footprint, I remarked that it was way down from what we had been seeing in 2007 and 2008.  The consensus from everybody in the room was that p2p usage is waning. Obviously this is not a wide data base to draw a conclusion from, but we have seen the same trend at many of our customer installs (3 or 4 a week), so I don’t think it is a fluke. It is kind of ironic, with all the controversy around Net Neutrality and Bit-torrent blocking,  that the problem seems to be taking care of itself.

So, what are the reasons behind the decline? In our opinion, there are several reasons:

1) Legal Itunes and other Mp3 downloads are the norm now. They are reasonably priced and well marketed. These downloads still take up bandwidth on the network, but do not clog access points with connections like torrents do.

2) Most music aficionados are well stocked with the classics (bootleg or not) by now and are only grabbing new tracks legally as they come out. The days of downloading an entire collection of music at once seem to be over. Fans have their foundation of digital music and are simply adding to it rather than building it up from nothing as they were several years ago.

3) The RIAA enforcement got its message out there. This, coupled with reason #1 above, pushed users to go legal.

4) Legal, free and unlimited. YouTube videos are more fun than slow music downloads and they’re free and legal. Plus, with the popularity of YouTube, more and more television networks have caught on and are putting their programs online.

Despite the decrease in p2p file sharing, ISPs are still experiencing more pressure on their networks than ever from Internet congestion. YouTube and NetFlix  are more than capable of filling in the void left by waning Bit-torrents.  So, don’t expect the controversy over traffic shaping and the use of bandwidth controllers to go away just yet.

Comcast fairness techniques comparison with NetEqualizer


Comcast is now rolling out the details of their new policy on Traffic shaping Fairness as they get away from their former Deep Packet inspection.

For the complete Comcast article click here

Below we compare techniques with the NetEqualizer

Note: Feel free to  comment if you feel we  need to make any corrections in our comparison our goal is to be as accurate as possible.

1) Both techniques make use of slowing users down if they exceed a bandwidth limit over a time period.

2) The Comcast bandwidth limit kicks in after 15 minutes and is based only on a customers usage over that time period, it is not based on the congestion going on in the overall network.

3) NetEqualizer bandwidth limits are based on the last 8 seconds of customer usage, but only kick when the overall Network is full.  (the aggregate bandwidth utilization of all users on the line has reached a critical level)

4) Comcast punishes offenders by cutting them back  50 percent for a minimum of 15 minutes

5) NetEqualizer punishes offenders  just a few seconds and then lets them back to full strength. It will hit the offending connection with a decrease ranging from 50 to 80 percent.

6) Comcast puts a restriction on all traffic to the user during the 15 minute Penalty period

7) NetEqualizer only punishes offending connections , for example if you were running an FTP download and a streaming audio , only the FTP download would be effected by the restriction.

In our opinion both methods are effective and fair.

FYI NetEqualizer also has a Quota system which is used by a very small percent of our customers. It is very similar to the Comcast 15 minute system only that the time interval is done in Days.

Details on the NetEqualizer Quota based system can be found in the user guide page 11.

Created by APconnections, the NetEqualizer is a plug-and-play bandwidth control and WAN/Internet optimization appliance that is flexible and scalable. When the network is congested, NetEqualizer’s unique “behavior shaping” technology dynamically and automatically gives priority to latency sensitive applications, such as VoIP and email. Click here for a full price list.

Comcast Should Adopt Behavior-Based Shaping to Stay out of Trouble


Well it finally happened…

As reported by the NY times :

SAN FRANCISCO — Comcast, the country’s largest residential Internet provider, said on Thursday that it would take a more equitable approach toward managing the ever-expanding flow of Web traffic on its network.

The cable company, based in Philadelphia, has been under relentless pressure from the Federal Communications Commission and public interest groups after media reports last year that it was blocking some Internet traffic of customers who used online software based on the popular peer-to-peer BitTorrent protocol.

As many of our ISP customers already know, we have been proselytizing that using layer-7 packet shaping is a slippery slope for any provider and it was only a matter of time before a large provider such as Comcast would be forced to change their ways.

Note: Layer-7 shaping involves looking at data to determine what it is. A technique commonly used to identify bit torrent traffic.


The NetEqualizer methodology for application shaping has been agnostic with respect to type of data for quite some time. We have shown through our thousands of customers that you can effectively control and give priority to Internet traffic based on behavior. We did not feel comfortable with our layer-7 application shaping techniques and hence we ceased to support that methodology almost two years ago. We now manage traffic as a resource much the same way a municipality would/should ration water if there was a shortage.

Customers understand this. For example, if you simply tell somebody they must share a resource such as water, the Internet, or butter (as in WWII), and that they may periodically get a reduced amount, they will likely agree that sharing the resource is better than one person getting all of the resource while others suffer. Well, that is exactly what a NetEqualizer does with Internet resources, albeit in real time. Internet bandwidth is very spiky. It comes and goes in milliseconds and there is no time for a quorum.

We’ll keep an eye on this for you. If you are interested in learning more about how our technology differs from application-based shaping, the following link is very useful:

http://www.netequalizer.com/Compare_NetEqualizer.php

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