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Some basics about edge caching, network management, & Net neutrality

by on December 18, 2008 · 7 comments

The introduction below was originally written by Adam Thierer, but now that I (Adam Marcus) am a full-fledged TLF member, I have taken authorship.

My PFF colleague Bret Swanson had a nice post here yesterday talking about the evolution of the debate over edge caching and network management (“Bandwidth, Storewidth, and Net Neutrality“), but I also wanted to draw your attention to related essay by another PFF colleague of mine. Adam Marcus, who serves as a Research Fellow and Senior Technologist at PFF, has started a wonderful series of “Nuts & Bolts” essays meant to “provide a solid technical foundation for the policy debates that new technologies often trigger.” His latest essay is on Network neutrality and edge caching, which has been the topic of heated discussion since the Wall Street Journal’s front-page story on Monday that Google had approached major cable and phone companies and supposedly proposed to create a fast lane for its own content.

Anyway, Adam Marcus gave me permission to reprint the article in its entirety down below. I hope you find this background information useful.

Nuts and Bolts: Network neutrality and edge caching

by Adam Marcus, Progress & Freedom Foundation

December 17, 2008

This is the second in a series of articles about Internet technologies. The first article was about web cookies. This article explains the network neutrality debate. The goal of this series is to provide a solid technical foundation for the policy debates that new technologies often trigger. No prior knowledge of the technologies involved is assumed.

To understand the network neutrality debate, you must first understand bandwidth and latency. There are lots of analogies equating the Internet to roadways, but it’s because the analogies are quite instructive. For example, if one or two people need to travel across town, a fast sports car is probably the fastest method. But if 50 people need to travel across town, it may require 25 trips in a single sports car. So a bus which can transport all 50 people in a single trip may be “faster” overall. The sports car is faster, but the bus has more capacity. Bandwidth is a measure of capacity, of how much data can be transmitted in a fixed period of time. It is usually measured in Megabits per second (Mbps). Latency is a measure of speed, of the time it takes a single packet data to travel between two points. It is usually measured in milliseconds. The “speeds” that ISPs advertise have nothing to do with latency; they’re actually referring to bandwidth. ISPs don’t advertise latency because its different for each different site you’re trying to reach. Continue reading →

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Bandwidth, Storewidth, and Net Neutrality

by on December 16, 2008 · 14 comments

Very happy to see the discussion over The Wall Street Journal‘s Google/net neutrality story. Always good to see holes poked and the truth set free.

But let’s not allow the eruptions, backlashes, recriminations, and “debunkings” — This topic has been debunked. End of story. Over. Sit down! — obscure the still-fundamental issues. This is a terrific starting point for debate, not an end.

Content delivery networks (CDNs) and caching have always been a part of my analysis of the net neutrality debate. Here was testimony that George Gilder and I prepared for a Senate Commerce Committee hearing almost five years ago, in April 2004, where we predicted that a somewhat obscure new MCI “network layers” proposal, as it was then called, would be the next big communications policy issue. (At about the same time, my now-colleague Adam Thierer was also identifying this as an emerging issue/threat.)

Gilder and I tried to make the point that this “layers” — or network neutrality — proposal would, even if attractive in theory, be very difficult to define or implement. Networks are a dynamic realm of ever-shifting bottlenecks, where bandwidth, storage, caching, and peering, in the core, edge, and access, in the data center, on end-user devices, from the heavens and under the seas, constantly require new architectures, upgrades, and investments, thus triggering further cascades of hardware, software, and protocol changes elsewhere in this growing global web. It seemed to us at the time, ill-defined as it was, that this new policy proposal was probably a weapon for one group of Internet companies, with one type of business model, to bludgeon another set of Internet companies with a different business model. 

We wrote extensively about storage, caching, and content delivery networks in the pages of the Gilder Technology Report, first laying out the big conceptual issues in a 1999 article, “The Antediluvian Paradigm.” [Correction: “The Post-Diluvian Paradigm”] Gilder coined a word for this nexus of storage and bandwidth: Storewidth. Gilder and I even hosted a conference, also dubbed “Storewidth,” dedicated to these storage, memory, and content delivery network technologies. See, for instance, this press release for the 2001 conference with all the big players in the field, including Akamai, EMC, Network Appliance, Mirror Image, and one Eric Schmidt, chief executive officer of . . . Novell. In 2002, Google’s Larry Page spoke, as did Jay Adelson, founder of the big data-center-network-peering company Equinix, Yahoo!, and many of the big network and content companies. Continue reading →

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