Avalanche is a network capacity assessment appliance that simulates the observed or expected characteristics of Internet traffic (clients), so that network administrators and managers can assess an Internet site or network's capacity. Avalanche integrates easily into development, staging, testing, and production Internet environments. It combines reliable, system-level hardware with user-friendly software that is easily configurable.
When a typical Internet user browses a site, they request a sequence of URLs, starting with the main page and all of its embedded images, followed by several subsequent Web pages. An Internet user can fill out forms or secure transactions using SSL. Some users want to simply transfer a binary file, while others want to watch streaming media. The real-time Internet traffic generated by Avalanche is referred to as SimUsers (simulated users).
Internet users exhibit widely varying characteristics, such as their hardware, browser software, and client-server activity and behavior. Avalanche simulates different user characteristics through client profiles. Avalanche correlates each client profile with a set of associated test files to simulate many simultaneous users (SimUsers).
For example, a site analysis reveals that approximately 60% of Internet users enter your Internet site, click on three to five links in rapid succession, and then exit. The remaining 40% enter the site and browse ten or more separate pages for one minute before moving on to the next page. With Avalanche, you can quickly create two separate client profiles to simulate both types of Internet user activity in a single test.
Performance Specifications
Avalanche is a tightly integrated appliance with a micro-kernel operating system that takes optimal advantage of the underlying hardware. It leverages a customized TCP/IP stack along with high-performance drivers for maximum functionality and robustness.
Spirent Communications designed and implemented a proprietary IP stack to handle large numbers of simultaneous connections, while delivering realistic link latency characteristics. Avalanche operates according to these specifications:
Maintains up to 2 million simultaneous TCP connections
Supports standard HTTP 1.0 and 1.1, HTTPS, standards-based RTSP/RTP, passive FTP, POP3, SMTP, Microsoft Windows Media, DNS, Telnet, Capture Replay for TCP and UDP, and Video On Demand (VoD) multicasting
Uses TCP/IP protocol to issue HTTP requests for targeted URLs
Complies with standard TCP/IP stack implementations
Generates up to 50,000 HTTP requests per second with GigEthernet NICs
Generates up to 15,000 concurrent RTSP streams
Handles a maximum throughput of over 2.2 Gbps with GigEthernet.
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