CacheFlow Defines a New Internet Infrastructure Category with Introduction of New Server Accelerator Family.

Business Editors/High-Tech Writers

NetWorld Interop Atlanta 2000

Booth No. 5854

SUNNYVALE, Calif.--(BUSINESS WIRE)--September 18, 2000

Single Server Accelerator delivers the content of five to

ten web servers at a fraction of cost

CacheFlow(R) Inc. (Nasdaq:CFLO), the leading provider of content intelligent networking solutions today announced availability of the industry's first family of appliances built to dramatically increase the scalability and performance of high-traffic web sites. The CacheFlow Server Accelerator family enables web sites to serve 5-10 times more content through existing server and network infrastructure and reduces user response times by 50-80 percent. This translates into web sites that can serve more transactions with a lower cost infrastructure, enabling content publishers, web hosters and enterprises to increase revenue, enhance customer loyalty and maximize rack space.

"There are two fundamental sides to the Internet performance equation: the network and the servers," said Greg Howard, principal analyst at HTRC Group, LLC. "Network side performance is being addressed through caching and content delivery services, but the server side has been relatively neglected. Historically, the only way to deal with server bottlenecks was to buy more servers, which is expensive, difficult to manage and space-inefficient. CacheFlow Server Accelerators are a cost-effective way of solving server side performance problems."

"CacheFlow pioneered the caching appliance and quickly grew to the number one caching appliance vendor because of our ability to meet specific customer needs," said Patrick Harr, vice president of marketing at CacheFlow. "Now with the introduction of the Server Accelerator family customized for web server environments, CacheFlow has broadened the market opportunity and use of content intelligent appliances that understand the specific needs of business applications."

Broad Applications for Server Accelerators

CacheFlow Server Accelerators accelerate performance and scale traffic levels for the following customers:

-- E-commerce, E-business, Content and Portal sites - Server Accelerators
deliver a higher quality experience to visitors, generating more revenue and
increasing customer loyalty.

-- Enterprises - Server Accelerators accelerate Intranet/Extranet content to
employees, partners and customers, increasing productivity and optimizing the
supply chain.

-- Web Hosting Providers - Server Accelerators boost performance within a
hosted customer's infrastructure as a managed service offering. On July 31,
2000, Exodus Communications announced the industry's first web acceleration
service using CacheFlow Server Accelerators.

-- Content Distribution Networks - Server Accelerators deploy in combination
with other caching technologies to connect web servers to both public and
dedicated content distribution networks. On June 26, 2000, Akamai announced it
would resell the CacheFlow Server Accelerator with the CacheFlow Akamaizer to
automatically convert content to work with the Akamai FreeFlow content
distribution service.

An Innovative Solution for Scaling Web Servers

The CacheFlow Server Accelerator family provides immediate performance benefits by transparently integrating with a site's existing web server infrastructure. The Server Accelerator is placed "in front" of a site's existing server farm, where it receives all inbound requests for content. The Accelerator then serves both traditional (HTTP) and secure (HTTPS) content directly from memory to the end user, including static images, multimedia files and dynamic content. Because Servers Accelerators offload up to 95 percent of a site's content delivery from back-end servers, web servers can focus on querying databases and running application logic and scripts.

Robust Features Solve Site Challenges

CacheFlow Server Accelerators address key challenges beyond performance and scalability, including:

-- High-volume secure content delivery - CacheFlow Server

Accelerators with integrated Secure Socket Layer, accelerate

secure content quickly and efficiently. Optimized Server

Accelerators with integrated SSL process ten times more key

transactions and sessions per second than standard web

servers, without the need for costly hardware add-ons or

complex multiple box designs.

-- Content management - CacheFlow Content Manager (optional)

intelligently synchronizes and manages content across a

distributed network of Server Accelerators, essential for

sites that manage large volumes of frequently changing

content.

-- Content distribution - Server Accelerators can be deployed as

integral components of public and dedicated content

distribution networks. In August 2000, the Euro 2000 soccer

web site deployed Server Accelerators as part of a dedicated

content distribution network to guarantee the delivery of

dynamic content and manage peak crowds. This scalable solution

produced fast and up-to-the-second information to millions of

fans, served over 1.4 billion hits and set a new Guinness

World Record for the most visitors to an event-based web site.

-- Dynamic content acceleration - CacheFlow Server Accelerators

accelerate highly dynamic pages based on a set of customizable

rules. For example, the appliances can cache and deliver

dynamic stock quotes for short periods of time and offload

thousands of requests from the web server.

-- Protection against Denial of Service attacks - Server

Accelerators protect sites from common denial of service (DoS)

attacks by recognizing and shutting down malicious

connections.

In addition to this core functionality, CacheFlow Server Accelerators integrate with leading solutions from CacheFlow ACE (Adaptive Content Exchange) partners to optimize content publishing, load balancing and site reporting. This integration allows sites to build world-class content intelligent networks.

Scalable Server Accelerator Family

The CacheFlow Server Accelerator family includes entry-level 1U 710, 725 and 735 models; a mid range 3725 model; and a high end 5725 model. All models run the CacheOSTM Server Edition, an operating system optimized for web server acceleration. The software is tuned for the workload of a high-traffic Web site, where a finite amount of content can be accessed by millions of users.

Availability

The 710, 725, 745, 3725 and 5725 Server Accelerators are available now. Prices range from $9,995 for the entry-level 700 series to $84,995 for the 5725.

About CacheFlow Inc.

CacheFlow is focused on building a new layer of content intelligent infrastructure that makes the Internet content-smart. CacheFlow's market-leading appliances and innovative content delivery technologies enable enterprises, service providers and content providers to deliver the right content to the right place at the right time. Based in Sunnyvale, California, CacheFlow can be contacted via telephone at [phone], fax at [phone] or email at [e-mail].

Forward Looking Statements

The statements contained in this press release that are not purely historical are forward-looking statements, including statements regarding CacheFlow's expectations, beliefs, intentions or strategies regarding the future. All forward-looking statements included in this press release are based upon information available to CacheFlow as of the date hereof, and CacheFlow assumes no obligation to update any such forward-looking statements. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. These and other risks relating to CacheFlow's business are set forth in CacheFlow's Form 10-Q for the quarter ended July 31, 2000, and other reports filed from time to time with the Securities and Exchange Commission.

Notes to Editors:

CacheFlow is a registered trademark of CacheFlow Inc. in the U.S. and worldwide. All other trademarks mentioned in this document are the property of their respective owners.

Please see CacheFlow at NetWorld+Interop Atlanta, September 26 - 28, Booth No. 5854.