Instruction manual

Appendix A: Policy Expressions
NetScaler 9000 Series Installation and Configuration Guide - Volume 1 A-1
NSICG60_JAN05
Appendix A:
Policy Expressions
Several NetScaler features are controlled using policies. For example, a
compression policy defines the conditions for compressing content. A policy
typically consists of an expression and an action. The following diagram
illustrates this concept.
Figure A-26 Diagrammatic representation of a policy
The features that use policies are:
z Content Switching
z Content Filtering
z Compression
z Cache Redirection
z SSL VPN
z Priority Queuing
z DoS Protection
z Sure Connect TM
Expressions are a common pool of conditions that can be applied on content
entering the NetScaler system. Expressions are shared among features. On the
other hand, actions are feature-specific. For example, you can create an
expression to identify ASP files. You can then create a compression policy
that uses this expression to compress all ASP files. You can also create a
content switching policy that redirects the request for an ASP file to an
appropriate vserver. The following example illustrates this.