Peer-to-peer file sharing—a common way for students, teachers, researchers, and others to share large files, such as software or videos, over the internet—has been as unpopular with internet service providers (ISPs) as it has been popular with users. Many ISPs have banned, blocked, or slowed peer-to-peer traffic in their efforts to keep the flood of music, video, games, and software from overwhelming their networks. But Verizon Communications Inc. has broken ranks with the industry and says it plans to help its users share files faster—at least those who do so legally.

Verizon has collaborated with researchers at Yale University and a group of companies that make file-sharing software to enable faster downloads for consumers and lower costs for participating ISPs.

File sharing constitutes one-third of all internet traffic, according to Arbor Networks, a maker of traffic-management equipment, and some estimates are higher.

At a conference in New York last week, the Verizon group presented test results showing that when an ISP cooperates with a file-sharing software maker, it can speed downloads an average of 60 percent—though collaboration boosted some downloads six-fold on fast internet connections.

“This test signifies a turning point in the history of peer-to-peer technology and ISPs,” said Robert Levitan, chief executive of file-sharing company Pando Networks Inc. “It will definitely show ISPs that the problem is not peer-to-peer technology, the problem is how you deploy it. It is possible to deploy P2P to their advantage.”

In P2P systems, users download files from one another, often at the same time they’re uploading files to other users. The original Napster was a P2P system, as are the KaZaa and BitTorrent systems in current use.

One of the problems for ISPs has been that file-sharing networks connect users more or less at random around the globe—so a file sharer in the United States might simultaneously download files from Greece and Japan and upload to users in Belgium and Argentina, for example. This long-distance carriage is expensive for ISPs.

Verizon shared details about the structure of its network with the researchers and Pando in the “P4P Working Group,” created last summer, and together they created a system that connected users not randomly, but to other users close by.

In a traditional P2P network, if a Verizon customer downloads a file, only 6.3 percent of the data will come from another Verizon customer in the same city, said Doug Pasko, senior technologist at the company. In the “P4P” trial, 58 percent of the data came from nearby Verizon users, vastly reducing the company’s cost of carrying the traffic.

Levitan said the technology might be ready for use by next month, when NBC makes available free downloads of its TV shows using Pando’s software. The shows will be financed by advertising, and P2P technology will be an essential way for NBC to cut costs. Distributing an hour-long TV show in high definition using traditional delivery systems would cost the network about $1. With P2P technology, that cost can be cut by 75 to 90 percent.

“The internet is quickly transforming into a media-distribution platform, and there are people who say: ‘It will break. It’s not built to move music and movies and games and software,’” said Levitan. “New technologies are needed, and this is one of those technologies.”

For other ISPs to reap the benefits Verizon realized in the test, they too would have to share information about their networks with file-sharing companies—information they normally keep guarded.

“That’s one of the objectives we have to solve—how are we going to consolidate this [information] and distribute it?” Pasko said, adding that the results of the test give ISPs plenty of incentive to collaborate.

A problem the “P4P” system does not address is that file-sharing software makes extensive use of a customer’s connection, both for uploads and downloads. This is not much a problem for phone companies such as Verizon, but it is for cable companies, where up to 500 households share capacity on the local coaxial cable.

Cable companies have been the toughest on P2P file sharing. Comcast Corp., the country’s largest cable company, is being investigated by the Federal Communications Commission for secretly placing temporary roadblocks in the way of file-sharing traffic. Other cable companies admit to using less drastic methods to slow file sharing and keep it from drowning out other forms of traffic.

AT&T Inc. also has sounded the alarm on file sharing, saying it is looking at ways to block its customers from sharing and downloading pirated content—an approach Verizon rejects.

“Verizon does not accept the role of network police agency,” the company said.

Pasko stressed, however, that Verizon wants to work with P2P companies that are focusing on the delivery of legitimate media, such as Pando—not systems where anyone can upload anything, which usually means lots of pirated material.

Verizon’s acceptance of peer-to-peer traffic also doesn’t extend to its wireless networks: It bans the technology for users of its laptop cards. Much like cable modem users, wireless users share download capacity with others in the neighborhood.


Verizon Communications Inc.

Pando Networks Inc.

Distributed Computing Industry Association