Industry-leading app delivery with advanced load balancing

NetScaler load balancing ensures that applications and services are 100 percent available to all users. Application performance is maximized by a set of powerful acceleration capabilities, including intelligent data compression, static and dynamic content caching, and multiple TCP optimizations that improve the efficiency of the network.

Intelligent load balancing

NetScaler load balancing and content switching capabilities improve the efficient use of server resources by intelligently distributing application requests among multiple servers. NetScaler increases server efficiency and enhances application availability by directing each request to the right server.

Advanced L4-7 load balancing

The NetScaler load balancer delivers the industry's broadest array of load balancing technologies, including health monitoring, session persistence, network integration and content switching.
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Global load balancing

NetScaler manages application traffic among multiple global datacenters, ensuring that geographically distributed users have their sessions routed to the closest or best performing datacenter.
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SQL database load balancing

NetScaler DataStream technology intelligently distributes database queries for Microsoft SQL Server and Oracle MySQL infrastructures.
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NetScaler AppCache

Citrix NetScaler includes AppCache, a powerful, fully integrated caching solution that stores static and dynamically-generated application content, such as HTML pages, images, reports and web objects, directly in NetScaler memory. Frequently requested content is directly delivered to clients, offloading busy web servers and reducing the number of round-trips to substantially improve the performance of web applications.

AppCache includes the following key features:

  • Advanced caching policy controls: Granular, expression-based policy controls to cache targeted static and dynamic content.
  • Powerful content expiry mechanisms: Multiple methods to expire content held in NetScaler cache to ensure application users always receive up-to-date content.
  • High-capacity memory caching: NetScaler nCore technology offers the industry's highest memory cache capacity—up to 48GB of storage, 12 times more than the caching memory provided by most other application delivery controllers (ADCs).
  • External cache redirection: Automatically redirects requests for specific content to external caching systems in closer proximity to the user to further offload back-end servers, speed application responsiveness and reduce expensive bandwidth consumption.

NetScaler AppCompress

Citrix NetScaler accelerates web application performance through advanced HTTP compression technologies, which are supported by all commercial web browsers. NetScaler AppCompress reduces the size of HTTP and HTTPS responses sent from servers to client browsers – before they are transmitted. By sending less data to application clients, NetScaler AppCompress drives significantly faster response times for most web applications and reduces network bandwidth requirements.

NetScaler AppCompress can compress most types of static and dynamic content including those based on HTML and XML as well as MIME types such as text/rtf, and text/CSS, plus application data such as documents used by common productivity tools (e.g. Microsoft Office).

Both GZIP and DEFLATE compression algorithms are supported, and compatibility with the client browser is automatically checked to make sure the browser supports the algorithm for a transparent user experience. All AppCompress configuration takes place in the single NetScaler policy manager for easy deployment.

Protocol Optimization

NetScaler provides a host of advanced technologies to optimize WAN protocols including TCP to improve the efficiency of the underlying network infrastructure, while still preserving 100 percent interoperability with all clients.

NetScaler protocol optimizations include:

TCP Westwood protocol support

Significant amounts of web traffic are now originating from mobile users. Current TCP implementations rely on packet loss as an indicator of network congestion. Such methods cannot distinguish congestion-based loss from loss invoked by noisy links, overlapping channels and signal attenuation. As a consequence, traditional TCP often results in degraded performance. In order to obtain the ideal performance in a mobile network, TCP Westwood is used, resulting in higher average throughput and reduced dropped calls for mobile users.

Multipath TCP

Maintaining multiple client to server paths for the same TCP flow allows dynamic use of the most optimal path for data transfer and improves the end user experience for faster data transmissions. Mobile device communications, particularly those running LTE and other 4G networks, are especially enhanced. NetScaler now holds a dual TCP stack in between the service and client to help with client mobility and efficient access.

SPDY protocol support

SPDY is a new protocol introduced for lightweight HTTP processing, aimed at reducing bandwidth utilization and making Internet communications faster. Most browsers support SPDY today, but server/app infrastructures largely run on HTTP. NetScaler provides a gateway to transform messages from SPDY to HTTP, ensuring communication to clients and servers in HTTP as well as SPDY. This gateway feature enables L7 optimization, including full L7 content switching with analytics, and provides time for datacenters to move to SPDY support.

NetScaler Expert Series: Introduction to Cache Redirection

Senior Software Development Engineer Akshat Choudhary introduces Cache Redirection and explains the common deployment scenarios.

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