Book Image

Mastering NetScaler VPX

By : Marius Sandbu, Andy Paul
Book Image

Mastering NetScaler VPX

By: Marius Sandbu, Andy Paul

Overview of this book

Citrix NetScaler is one of the best Application Delivery Controller products in the world. The Application Delivery Controllers are commonly used for load balancing purposes, to optimize traffic, and to perform extra security settings. This book will give you an insight into all the available features that the Citrix NetScaler appliance has to offer. The book will start with the commonly used NetScaler VPX features, such as load balancing and NetScaler Gateway functionality. Next, we cover features such as Responder, Rewrite, and the AppExpert templates, and how to configure these features. After that, you will learn more about the other available Citrix technologies that can interact with Citrix NetScaler. We also cover troubleshooting, optimizing traffic, caching, performing protection using Application Firewall, and denying HTTP DDoS attacks for web services. Finally, we will demonstrate the different configuration principles real-world Citrix NetScaler deployment scenarios.
Table of Contents (15 chapters)
Mastering NetScaler VPX™
Notice
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Index

Policies and expressions


In a lot of Citrix NetScaler's features, we can use policies and expressions based on our requirements. Also, based on our requirements, we can make a difference depending on particular expressions. For example, it's possible to show different information for Windows clients and Mac OS X clients.

An expression can enable NetScaler to accomplish the following:

  • Return the hostname in an HTTP request

  • Determine the IP address of a client that sent a TCP request

  • Identify the data that an HTTP request contains (for example, a popular spreadsheet or a word-processing application)

  • Calculate the length of an HTTP request

Citrix NetScaler supports classic and default syntax policies and expressions. Based on the feature, Citrix NetScaler supports one or both of the syntaxes. The default syntax provides greater capabilities than the classic syntax. The default syntax policies enable us to use more enhancements with respect to analyzing data, so it's possible to analyze the HTTP headers...