Radware's Cache Server Director (CSD) Version 1.3 Now Supports Transparent Caches/Proxie

Radware announces the release of version 1.3 for its Cache Server Director (CSD), an intelligent cache server management and load balancing device. The new version enhancements are designed to increase the CSD’s versatility and increase its compatibility with the major cache server vendors. The CSD is an IP load balancing switch designed for use in environments that deploy multiple cache servers. The CSD sits logically between user groups and the Internet. It intercepts user requests and redirects them to the most available Cache server. It optimizes cache resources by intelligently load balancing between servers, detecting server failure and eliminating duplication of content.

Cache servers are being deployed in more and more networks globally to improve performance by caching content locally. This prevents users from having to navigate the Internet to retrieve content. It also allows organizations to optimize existing bandwidth. In order to eliminate bottlenecks and single points of failure, many users are deploying multiple cache servers (farms). Radware’s CSD was designed to intelligently load balance for any array of cache servers. The CSD improves response time, and optimizes bandwidth by ensuring that the most responsive cache server will handle the user request. In addition it optimizes the cache servers by eliminating duplication of content between them and detecting and eliminating failed units within the cluster. Since the CSD maintains an internal URL table it has awareness into which cache server contains which content. In the event that all cache servers are down the CSD directs user requests directly to the Internet.

Version 1.3 ads full support for transparent as well as non-transparent cache servers. Prior versions of CSD were optimized for deployment in non-transparent caching environments. However, many cache server vendors deploy their products in transparent mode, meaning that packets sent from the user have a destination address beyond the cache server. The CSD is now capable of being deployed together with such transparent caches. Asymmetric traffic flow (out of path return) is an additional advantage of this deployment scheme, where the CSD will intercept user requests and forward them directly to the most available cache server. Since no IP header manipulation has taken place the cache servers can communicate directly back to the end user. Since return traffic does not have to pass back through the CSD overall system performance is increased.

Other Enhancements Include:

Multiple port interception
By default, the CSD intercepts all TCP port 80 (default for HTTP) traffic transparently and redirects it to the cache farm. Now, an additional 20 ports can be configured for interception. Each port can be TCP or UDP. Also, an entry can be for a non-80 port, but can be defined as the HTTP protocol. All traffic that meets interception criteria is redirected to the cache servers. If the cache server is operating transparently, the traffic is simply forwarded to the cache server as a next hop router. If the cache server is operating non-transparently, destination IP address translation is performed.

URL Policies
The CSD allows URL policies to be defined per destination URL or IP address. Each policy determines how the CSD will handle requests toward the specific destination. The CSD can apply one of 3 policies to each entry:

  • Blocked: The CSD blocks access to the specified destination URL or IP address.
  • Direct: The CSD forwards client traffic for the specified destination URL or IP address directly to the Internet destination, without forwarding the session to one of the cache servers.
  • Local server: The CSD will forward the specified destination URL or IP address to a specified local cache server.
  • Network Address Translation – NAT: Version 1.3 adds full NAT capabilities to the CSD product line.

About Radware

Radware pioneered the field of IP load balancing in 1997 with the introduction of the Web Server Director (WSD). Today it is the only company that offers a complete IP load balancing solution for all local or global applications. Radware Ltd. is a member of the $3 billion dollar RAD Group, a family of 13 independent companies serving diverse markets and technology niches within the networking and communications industry. Radware was established in 1997 to focus on load balancing technology. Radware’s award-winning products are installed in Fortune 500 companies and Internet Service Providers worldwide. Radware’s products have won numerous awards, including the prestigious PC Magazine "Editors’ Choice" award; Network Magazine "Product of the Year" award; Internet Computing "Net Best" award; and Network Computing "Editor’s Choice", "Best Value", "Well-Connected" and "Flying Colors" awards. Certifications include the internationally recognized OPSEC™ (Open Platform for Secure Enterprise Connectivity) for FireProof, Radware’s high availability firewall load balancer. GSA Contract Number: GS-35F-4196D. For more information, visit our Internet site at www.radware.com.