4.75M2008-2-28 13:50:04

Getting Started Guide for version 8.0 of PacketWise software for PacketShaper

PacketWise 8.0 手册

for Models 1200, 1550, 1700, 2500, 3500, 6500, 7500, 9500, 10000

PacketWise 8.0 includes several new capabilities, as well as many fixes:

The Xpress feature contains a new tunneling infrastructure that accommodates additional features (such as acceleration), supports more robust tunnels, offers tunnel management and monitoring in the browser interface, and includes expanded tunnel diagnostics.

• In Xpress 8.0, tunnels provide multiple functionality, with features that can be enabled individually:
  
  
  1. Compression: Although the basic functionality is the same, Xpress compression has been revamped in this release. It’s more efficient, has better firewall and MPLS support, and is more tolerant to latency and loss. Instead of the IPCOMP protocol, Xpress transports compressed data with TCP in stateful mode and raw IP (protocol 99) in stateless mode. This feature requires the compression key. In addition, two new compressors are available: UDPRT and RETD.
  2. Packing: When Xpress packing is enabled, multiple packets are combined into a single “super packet” before being sent through the Xpress tunnel. Since fewer packets are sent, packing saves on overhead introduced by packet headers. You can enable/disable packet packing globally, for a specific tunnel, or on a per-class or per-service basis. Packing is a feature that is included with the compression key.
  3. Acceleration: The acceleration feature significantly improves the performance of TCP/IP over high-latency networks (for example, international or satellite links). This feature requires the acceleration key. Acceleration allows you to maximize bandwidth utilization, speed up application response times, accelerate the transfer of large files, and minimize the impact of other problems that are common with TCP-based applications on high-latency links. High-speed links with small window sizes and moderate latency can also benefit from Xpress acceleration. In addition, the acceleration module is able to significantly improve performance of web-based applications on high-latency links. Two features allow you to accelerate HTTP traffic: FastStart and Prefetch. These features can be enabled together or separately.
• Automatic and Manual Tunnel Creation: Xpress tunnels are created automatically when a certain set of conditions is are met.
• Xpress Monitoring and Configuration via Xpress Tab: The new Xpress tab provides a convenient way to configure Xpress and monitor your tunnels in the browser interface. The Xpress Tunnels Overview lists all the enhanced tunnels that have been formed with your PacketShaper and indicates configuration information for each tunnel: name, functionality (compression, packing, acceleration), the IP address of the Xpress partner, and whether it’s static or dynamic. In addition, the Xpress tab displays Inbound and Outbound statistics for each tunnel.
• New Set of CLI Commands: for Xpress diagnostics and customization
• Expanded Diagnostics for Enhanced Tunnels: The Compression Summary report includes a new graph that explains why traffic wasn’t compressed.
• Class and Service Overrides Services: are pre-set with application-appropriate settings for packing and compression. For example, compression is disabled for non-compressible services, such as Apple-iTunes; latency-sensitive services, such as RadioNetscape and Streamworks, have a pre-set 1ms packing hold time. However, you can override these default settings. You can enable/ disable compression and/or packing on a per-service or per-class basis, enable/disable acceleration on a per-class basis, and you can customize the compression algorithm, dictionary size, and packing hold time for specific classes or services.

Other new capabilities:

• New feature set: VoIP Metrics:
  
  The new VoIP metrics feature allows you to measure three network metrics that impact VoIP quality:
  1. Jitter the variation in the delay of received packets in a flow
  2. Latency the time required for packets to travel from one PacketShaper to another, as measured by the formula round-trip time / 2.
  3. Packet loss the percentage of lost packets
• Intermediate Flow Detail Records: The intermediate flow detail record (FDR) allows you to configure your PacketShaper to emit FDRs at a configurable interval throughout long TCP flows as well as at the end of flows. This allows a suitably-instrumented collector, such as Cisco-based Netflow-5 collectors, to report flow data during long-lived flows.
• Measurement Variable Enhancements: New measurement variables have been added to generate statistics for:
  1. The effects of bandwidth saturation on a traffic class, including the total number of bytes transmitted, the number of bytes dropped due to congestion, and the percentage of total bytes that are dropped due to congestion.
  2. The status of acceleration and the number of accelerated bytes
• Classification Enhancements: The classification of the following services was previously available as a classification plug-in only. In 8.0, the classification for the following services does not require a plug-in. In addition to the services listed, many more services are now classified by PacketShaper. For a full list of new services, please refer to the release notes.

• AOL-AIM-ICQ
• AOL-iChat
• Ares
• BitTorrent
• eDonkey
• eXeem
• GoogleEarth
• Half-Life
• Hopster
• MSN-Messenger
• Q.931
• Share P2P
• Skype
• SoulSeek
• Unreal
• WAP
• WebEx
• Winny
• WorldofWarCraft
• XboxLive
• YahooMsg

• Adaptive Response: Two new variables have been added to the High Bandwidth Host agent template:

1. $violatingHosts: The name of the host list that contains the IP addresses of the hosts that were in violation
2. $exceptionHosts: The name of the host list that contains the IP addresses of the hosts in the host exception list

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