Touring the digital through type

Month: January 2009 (Page 1 of 4)

Summary: CRTC PN 2008-19; Requests for Public Disclosure Filings

200901222144.jpgI’ve just completed a summary document that pulls together the requests for disclosure from the various advocacy groups currently involved in the CRTC’s PN 2008-19 (ISP Internet Management Techniques). A few things that I found of interest:

  1. TELUS is being used as a lever against the other ISPs; the common metric is “TELUS released all this information in public, so what justification can the rest of the ISPs have for filing in confidence?”
  2. Public Interest Advocacy Center (PAIC) really focused on Bell and Rogers, and noted repeatedly that Bell has filed items in confidence in this public notice that it had been forced to file in public previously. Also, where Bell could claim confidentiality last time (Canadian Association of Internet Providers [CAIP] v Bell), this isn’t the case now because all the major ISPs will be forced to show their hands at the same time.
  3. Without historical and projected growth, it is impossible for public groups to argue whether or not current managing practices are appropriate. This data needs to be released so that they can fully response to the CRTC’s public notice.
  4. The Campaign for Democratic Media (CDM) is willing to have all of the ISPs’ traffic aggregated, so long as it is disclosed publicly what the trends are.
  5. CDM notes that without information on the top 5% and 10% of users, that it is impossible to ascertain what their actual impact on total bandwidth has been.
  6. CAIP, PAIC, and the Canadian Film and Television Production Association (CFTPA) all argue that it is important for clear, technical, explanations of congestion be provided – without this, it is challenging to effectively interrogate what is, or isn’t, happening on ISPs’ networks.
  7. PIAC stands that, if Bell didn’t have a congestion metric in place prior to January 2007 then they should be obligated to disclose information in public on the basis that their definitions of congestion need to be examined more closely than others (unstated, but this is in part because they are such a major player in Canada).
  8. CFTPA holds that Bell’s networking diagram is good, because it offers specifics into their network. In light of Bell’s submission, other parties should submit similarly detailed diagrams, with devices clearly labeled, so that members of the public can meaningfully comment on whether the network components use by ISPs are adequate or not.
  9. CAIP, CDM, PAIC, and CFTPA all maintain that knowing what products are being used to manage Internet traffic is critical – without this information it is challenging to actually comment on how throttling is occurring. CDM raises the privacy issue with DPI.

Thoughts: Deep Packet Inspection Analogies

200901221552.jpgIn reading through the recent CRTC filings, something that has been striking me is that the ‘regular’ metaphor for how Deep Packet Inspection (DPI) technologies work seems a bit awkward. When you send packets of data along the ‘net, they are broadly composed of a header and a payload. The metaphor goes as follows: the header is like the addressing information on an envelop, and the payload is the actual letter in the envelop. DPI opens the envelop, sees the content of the letter, examines it, reseals it, and then passes the letter along to its destination (assuming that the contents aren’t of a type that shouldn’t be sent onwards).

I like the metaphor because of its power, but at the same time I have to wonder about its accuracy, at least in the Canadian situation. When reading the ISP’s CRTC filings, I keep reading that they use DPI devices for flow analysis – they’re not looking for the content of your email, they just want to identify whether you’re sending email or an instant message. Rather than assume that the ISPs are being duplicitous, why not reconsider the metaphor to see if it can’t be developed to distinguish between different usages of DPI equipment. Continue reading

Comment: Canadian ISPs and Internet Traffic Management

200901201119.jpgI’ve recently put up a document that summarized most of the first round of filings for the CRTC’s investigation of Canadian ISP traffic management practices (PN 2008-19), and thought that I’d post a few things that I thought were most interesting (for me). Keep in mind that many of my interests revolve around deep packet inspection.

Network Use Averages

  1. Bell filed their specific data points in confidence, though from what they provided we can see that the top 5% of usage on the network has declined from 61.1% to 46.6%, and the top 10% of network usage has declined from 77.1% to 62.6%.
  2. In TELUS’ case, we find that their retail customers have decreased the amount of content they are uploading, though they are downloading more. Their wholesale customers are both downloading and uploading more than in 2006. Specific traffic data was filed in confidence to the CRTC.
  3. Bell finds that P2P and HTTP/Streaming traffic are the most commonly used end-user categories that contribute to bandwidth usage.

Canadian ISPs Admitting to Traffic Management

  1. Bell Wireline (excludes Bell Mobility and Bell Aliant Atlantic). DPI technology is used, though the vendor and products are filed in confidence.
  2. Cogeco uses DPI, but has filed the vendor and products in confidence.
  3. Rogers filed their comments in confidence, but from past information that has emerged we know that they are using DPI equipment.
  4. Shaw Communications Inc. uses Arbor-Ellacoya devices, though the particular products are filed in confidence.
  5. Barrett Xplore Inc. Uses VoIP prioritization, provisioning of modems, and DPI. Specifics are filed in confidence.
  6. While not explicitly stated, is appears as though Bragg Communications Ltd. also uses DPI. Continue reading

Summary: CRTC PN 2008-19; ISP Traffic Managment in Canada

200901191751.jpgAs someone who is academically invested in how the ‘net is being regulated in Canada, I’ve been following the recent CRTC investigation into Internet management practices and regulation with considerable interest. Given that few people are likely to dig though the hundreds of pages that were in the first filing, I’ve summarized the responses from ISPs (save for Videotron’s submissions; I don’t read French) to a more manageable 50 pages. Enjoy!

Update: Thanks to Eric Samson and Daniel for translating Videotron’s filings – you guys rock!

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