SteelHead™ Deployment Guide - Protocols : CIFS Optimization : RiOS CIFS Optimization Techniques
  
RiOS CIFS Optimization Techniques
The CIFS optimization module comprises many separate techniques. Many of these techniques are enabled by default, so when configuring a new SteelHead (or creating a new SteelCentral Controller for SteelHead Mobile package), minimal, if any, CIFS-specific configuration is required.
Typically, new features in RiOS, even ones that are widely applicable, are not enabled by default until they have been present for several releases. Some optimization features that are not enabled by default can provide benefit in your environment, and you can consider enabling them on an individual basis.
Modern CIFS servers generally listen on TCP port 445; for compatibility, they also listen to port 139. The CIFS optimization module within RiOS is designed to intercept traffic on these two ports for acceleration of file-sharing and remote Windows printing traffic.
After a CIFS connection is intercepted for optimization, the RiOS CIFS optimization module monitors the negotiation and session setup commands to detect which client and servers are in use, and what types of CIFS options are understood by each. As clients initiate requests to the server, RiOS applies its optimization techniques to reduce the time that the client awaits a response from the server.
For specific information about CIFS optimization features, see the SteelHead Management Console User’s Guide.