NETWORK WORLD NEWSLETTER: STEVE TAYLOR AND JOANIE WEXLER ON WIDE AREA NETWORKING 09/14/04 Today's focus: Managing WAN traffic on a per-flow basis
Dear [EMAIL PROTECTED], In this issue: * Per-flow capabilities important in traffic managers * Links related to Wide Area Networking * Featured reader resource _______________________________________________________________ This newsletter sponsored by Peribit Networks WAN Optimization Best Practices Whitepaper Optimizing application performance over the WAN is a multi-faceted problem that requires more than just QoS or compression. This paper describes an integrated approach that includes next-generation compression, sequence caching, latency reduction, bandwidth management, path optimization, and visibility. The result is LAN quality application performance across the distributed enterprise. Download this whitepaper at http://www.fattail.com/redir/redirect.asp?CID=80928 _______________________________________________________________ CHECK OUT NW FUSION'S NEW WHITE PAPER LIBRARY NW Fusion's White Paper Library was recently re-launched with new features and improved capabilities! Sort NW Fusion's library of white papers by Date and Vendor, view white papers by TECHNCIAL CATEGORY, mouse over white paper descriptions and take advantage of our IMPROVED white paper search engine. CLICK HERE: http://www.fattail.com/redir/redirect.asp?CID=81014 _______________________________________________________________ Today's focus: Managing WAN traffic on a per-flow basis By Steve Taylor and Joanie Wexler When managing WAN bandwidth for optimal performance, there are many technologies that queue traffic, sense congestion so you can throttle back traffic to smooth out packet flows and chop up packets into more transportable sizes. Many of these technologies are supported in traffic management appliances and sophisticated WAN access routers. When wading through the morass of technology options to invoke at the WAN edge to optimize application performance, there is no single solution that meets the requirements of all enterprises. Your choices will depend on the applications you support, how many sites you have, staff expertise and budget. But note also that there are certain applications, such as VoIP and Citrix, which, while they may not require much bandwidth, do require a minimum amount to function at all. For these applications, you will want to configure your traffic management system so that you have control over the number of concurrent flows within a traffic class - something you should be sure your system can do. For example, when using traffic management systems, the tendency is to allocate bandwidth based on a traffic class as a whole. A "class" is traffic you've deemed to be treated with the same priority (it can be an application, user group, traffic from particular site or some combination of these characteristics). You prioritize a traffic class by allocating a certain minimum amount of bandwidth to it, putting a ceiling on how much bandwidth it can consume, marking a priority tag in it for treatment by the service provider in the WAN or by using a combination of these and other techniques. But while 256K bits/sec of bandwidth is likely adequate, in aggregate, for 10 concurrent Citrix sessions (Citrix traffic could constitute a "traffic class"), it might not be adequate for more than 12 or 13 sessions, given that a single Citrix flow might require 20K bit/sec before dying on the vine. So one thing you might want to check out, capability-wise, in your traffic management system is your ability to allocate bandwidth within a traffic class on a per-flow basis. Per-flow treatment can be achieved using special per-flow queuing or TCP rate control techniques. Generally speaking, traffic management appliances are ahead of the curve on per-flow bandwidth allocation compared with routers. RELATED EDITORIAL LINKS Boosting TCP WAN performance Network World Wide Area Networking Newsletter, 08/19/04 http://www.nwfusion.com/newsletters/frame/2004/0816wan2.html Beyond network traffic management Network World Network Optimization Newsletter, 08/31/04 http://www.nwfusion.com/newsletters/accel/2004/0830netop1.html Cisco acquires carrier traffic management firm Network World Fusion 08/30/04 http://www.nwfusion.com/weblogs/routers/006114.html Making WANs more LAN-like Network World Wide Area Networking Newsletter, 07/06/04 http://www.nwfusion.com/newsletters/frame/2004/0705wan1.html Cisco, 3Com fire up new WAN routers Network World, 09/13/04 http://www.nwfusion.com/news/2004/091304routers.html _______________________________________________________________ To contact: Steve Taylor and Joanie Wexler Steve Taylor is President of Distributed Networking Associates and Publisher/Editor-in-Chief of Webtorials.Com. For more detailed information on most of the topics discussed in this newsletter, connect to Webtorials.Com <http://www.webtorials.com/>, the first Web site dedicated exclusively to market studies and technology tutorials in the Broadband Packet areas of Frame Relay, ATM, and IP. He can be reached at <mailto:[EMAIL PROTECTED]> Joanie Wexler is an independent networking technology writer/editor in California's Silicon Valley who has spent most of her career analyzing trends and news in the computer networking industry. She welcomes your comments on the articles published in this newsletter, as well as your ideas for future article topics. Reach her at <mailto:[EMAIL PROTECTED]>. _______________________________________________________________ This newsletter is sponsored by SBC Dialing for Dollars CRATE & BARREL'S VOIP MOVE NETS SAVINGS AND FLEXIBILITY An apples-to-apples comparison showed that a centralized, software-based, IP-based platform could provide significant cost savings and productivity benefits over a comparable, traditional PBX system. Download whitepaper now, click here http://www.fattail.com/redir/redirect.asp?CID=81058 _______________________________________________________________ ARCHIVE LINKS Archive of the WAN newsletter: http://www.nwfusion.com/newsletters/frame/index.html _______________________________________________________________ FEATURED READER RESOURCE NETWORK WORLD SPECIAL REPORTS NOW AVAILABLE Focused reports on compelling industry topics, Network World Special Reports are available online at Network World Fusion. 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