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  • Book Overview & Buying Implementing NetScaler VPX??? - Second Edition
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Implementing NetScaler VPX??? - Second Edition

Implementing NetScaler VPX??? - Second Edition

By : Marius Sandbu
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Implementing NetScaler VPX??? - Second Edition

Implementing NetScaler VPX??? - Second Edition

4 (3)
By: Marius Sandbu
Buy this Book

Overview of this book

With a large demand for responsive websites and availability of services, IT administrators are faced with an ever-rising need for services that are optimized for speed. NetScaler VPX is a software-based virtual appliance that provides users with the comprehensive NetScaler feature set. Implementing apps and cloud-based services is much easier with its increased service performance and integrated security features. This book will give you an insight into all the new features that NetScaler VPX™ has to offer. Starting off with the basics, you will learn how to set NetScaler up and configure it in a virtual environment including the new features available in version 11, such as unified gateway and portal theme customization. Next, the book will cover how to deploy NetScalar on Azure and Amazon, and you will also discover how to integrate it with an existing Citrix infrastructure. Next, you will venture into other topics such as load balancing Microsoft and Citrix solutions, configuring different forms of high availability Global Server Load Balancing (GSLB), and network optimization. You will also learn how to troubleshoot and analyze data using NetScaler's extensive array of features. Finally, you will discover how to protect web services using an application firewall and will get to grips with other features such as HTTP, DOS, and AAA.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. NetScaler VPX™ 11 – Basics and Setup
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1. NetScaler VPX™ 11 – Basics and Setup
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Getting started with NetScaler®
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Licensing
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Setup scenarios
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Creating our first setup
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NetScaler® modes and features
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NetScaler® networking
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Summary
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2. NetScaler Gateway™
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2. NetScaler Gateway™
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Understanding the features of NetScaler Gateway
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Deploying ICA Proxy
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Deploying VPN
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Deploying clientless access
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Binding the features together
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Unified Gateway
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Tuning
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Testing
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Summary
3
3. Load Balancing
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3. Load Balancing
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Load balancing a generic web application
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Logging and statistics
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Load balancing StoreFront
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Load balancing a web interface
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Load balancing XML Broker
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Load balancing the Desktop Delivery Controller
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Load balancing TFTP for provisioning servers
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Load balancing SharePoint 2013
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Load balancing Lync 2013
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Load balancing Exchange 2013
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Load balancing MSSQL
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Load balancing DNS
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Persistency groups
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Summary
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4. Mobilestream
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4. Mobilestream
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Compression
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Caching
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Frontend optimization
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Summary
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5. Optimizing NetScaler Traffic
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5. Optimizing NetScaler Traffic
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Tuning for virtual environments
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TCP tuning
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SSL tuning
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HTTP/2 and SPDY
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Summary
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6. High Availability
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6. High Availability
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Setting up high availability
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Redundant Interface Sets
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Clustering
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Global Server Load Balancing
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Summary
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7. Security and Troubleshooting
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7. Security and Troubleshooting
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Protecting services in NetScaler
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HTTP DoS protection
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Access lists
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Protecting services using NetScaler AppFirewall™
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Using AppFlow® to monitor traffic with NetScaler Insight Center™
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Analyzing issues using Citrix Insight Services
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Traffic analysis with NetScaler® tools and Wireshark
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Summary
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8. AAA Application Traffic
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8. AAA Application Traffic
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Setting up an AAA vServer
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Summary
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Index
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Index

NetScaler® modes and features

Now that we have added the license and configured most of the basic features, such as DNS, NTP, and SNMP, it's time to take a closer look at the different modes through which NetScaler can process traffic. The different modes can be found by navigating to System | Settings | Configure Modes.

Here, there are modes that we can configure depending on the following parameters:

  • How do we want NetScaler to process network traffic such as L2 and L3?
  • Where is NetScaler placed?

Not all the advanced features are covered here, as some of them are not relevant for every environment. Information about the remaining features can be found in the Citrix article at http://support.citrix.com/article/CTX121149. The different modes here decide how NetScaler should handle different kinds of traffic. So, a quick overview of the different modes is as follows:

  • Fast Ramp: This mode bypasses the slow-start mechanism of the TCP protocol and allows for a faster increment of TCP windowing, thereby allowing for faster packet transmission. This feature is enabled by default.
  • Layer 2 mode: This mode allows NetScaler to behave as a switch and should only be used if servers are directly attached to NetScaler, or if it is being used as a transparent bridge, for example, CloudBridge.
  • Use Source IP: By default, when NetScaler connects to a backend server, it uses one of its own addresses to establish a connection. By enabling the Use Source IP mode, the end client IP address is used to connect to the backend server. This should only be used in deployments where you need direct connections from the clients, or when you have an IDS environment. Make sure that when this feature is enabled, the backend servers must have one of NetScaler's IP addresses to be used as the Gateway IP address.
  • Client Keep-Alive: This feature is mostly useful when the backend server or service does not support client keep-alive. It allows clients to maintain connectivity to the appliance even if the backend server closes the connection. This eliminates the need to reestablish the connection between the client and the backend server, and will reduce the time needed for a client to reopen the connection. This feature should only be enabled if there are performance issues with a service.
  • TCP Buffering: This feature allows the adjustment of speed between a high-speed server and a slow client. If a backend server responds too fast for a client, the appliance will buffer the packets and adjust the speed based upon the speed of the client. This allows the backend server to devote the CPU resources to other tasks. This mode should be enabled if there are performance issues or if the TCP window scaling does not work, or shows high-packet loss.
  • MAC-based Forwarding: This mode allows NetScaler to return packets based upon the MAC address of the received packet. For example, in environments where you have multiple routers, and you need to make sure that the packets are returned through the same path, you need to enable the MAC-based Forwarding mode. If this feature is disabled, the return path is based upon the route lookup. By default, this feature is not enabled.
  • Edge Configuration: Enable this feature if clients are using the link load-balancing feature.
  • Use Subnet IP: This feature allows for the use of subnet IP addresses.
  • Layer 3 mode: When the Layer 3 mode is enabled, the NetScaler appliance performs route table lookups and forwards all packets that are not destined for any NetScaler-owned IP address. This mode is enabled by default, but it should be disabled if not used for security purposes.
  • Path MTU Discovery: This mode allows network devices to share information to determine the largest MTU size that can be allowed on a network, which reduces the amount of IP packet fragmentation. This mode is enabled by default.
  • Static Route Advertisement: This mode allows for the advertisement of static routes when using dynamic routing protocols.
  • Direct Route Advertisement: This mode allows for the advertisement of direct routes when using dynamic routing protocols.
  • Intranet Route Advertisement: This mode allows for the advertisement of intranet routes when using dynamic routing protocols.
  • IPv6 Static Route Advertisement: This mode allows for the advertisement of IPv6 static routes when using dynamic routing protocols.
  • IPv6 Direct Route Advertisement: This mode allows for the advertisement of IPv6 direct routes when using dynamic routing protocols.
  • Bridge BDPUs: This mode is used for the Spanning Tree Protocol, allowing NetScaler to participate or not participate in the STP state.
  • Media Classification: This mode is used to classify media content that is passed through NetScaler.

    Note

    When using NetScaler at the edge of the network as a firewall, uncheck all the boxes for route advertisement and Path MTU discovery.

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