LEXINGTON, Mass., August 4, 2004— Arbor Networks, a leader in network integrity systems, today announced that EarthLink (NASDAQ: ELNK), a leading national Internet Service Provider, has chosen Arbor’s Peakflow SP to analyze its transit, peering, and internal traffic. EarthLink will use Peakflow SP for capacity planning on its nationwide network to make intelligent peering decisions, which can reduce operating costs.

Peakflow SP’s ability to provide traffic analysis will help EarthLink track data levels between EarthLink’s points of presence (POPs). The traffic reports also will help EarthLink with its capacity planning, allowing EarthLink to better understand where traffic is destined, and enabling traffic engineers to make smart peering decisions that can reduce operating costs.

“At EarthLink, we are dedicated to providing outstanding customer service, innovative dial-up and high-speed services to our customers,” said Greg Collins, director of network engineering and operations, EarthLink. “By using Peakflow SP, we are able to expand our traffic monitoring and planning analysis, which will ultimately mean better service for our customers.”

By modeling the network with Peakflow SP, EarthLink can now more accurately predict the impact of network growth as well as proposed changes, such as the rollout of new applications and services. Peakflow SP’s analysis helps EarthLink operators identify possible network changes that can reduce network load, bypass hotspots, and reduce costs. With the ability to simulate network traffic to understand network behavior, EarthLink can select the best possible transit and peering relationships over the long-term.

“EarthLink has earned its reputation as a leading, innovative ISP,” said Tom Schuster, Arbor’s vice president of sales and marketing. “We’re pleased EarthLink chose Peakflow SP to address operational and peering challenges. Leading providers are using Peakflow SP’s traffic analysis to engineer their networks to support better peering agreements and additional VoIP and IP/TV services.”

Peakflow SP is the most broadly deployed network integrity system in the world, with over 80 customers that include the leading service providers and MSOs in North America, Europe and Asia.

About EarthLink
"EarthLink revolves around you(TM)." Celebrating ten years as a leading national Internet service provider (ISP), Atlanta-based EarthLink has earned an award-winning reputation for outstanding customer service and its suite of online products and services. Serving over five million subscribers, EarthLink offers what every user should expect from their Internet experience: high-quality connectivity, minimal drop-offs and ISP-generated intrusions, and customizable features. Whether it's dial-up, high-speed, Web hosting, or wireless Internet service, EarthLink provides the tools that best let individuals use and enjoy the Internet on their own terms. Learn more about EarthLink by calling (800) EARTHLINK or visiting EarthLink's Web site at www.EarthLink.net.

About Arbor Networks
Arbor Networks’ Peakflow is the most broadly deployed network integrity platform in the world, with over 80 customers that include leading service providers, MSOs in North America, Europe and Asia Pacific, the U.S. Department of Defense, and Fortune 500 companies. Arbor’s network integrity systems protect organizations from zero-day security threats such as DDoS attacks and worms, and operational vulnerabilities such as inefficient peering and routing instability. Built upon the proven Peakflow platform, Arbor solutions provide accurate, real-time awareness of behavior across the entire network, enabling organizations to better secure and more efficiently operate their networks. Arbor is headquartered in Lexington, MA, with a research and development office in Ann Arbor, MI and EMEA headquarters in London.

Copyright (c) 1999-2004 Arbor Networks, Inc. All rights reserved.

Note to Editors: Arbor Networks and Peakflow are registered trademarks and the Arbor Networks logo and ArbOS are trademarks of Arbor Networks, Inc. in the USA and other countries. All other trademarks are the property of their respective owners.

Media Inquiries:
Kate Munro
+1 781.768.3253
+1 978.771.3006
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it