LANforge is a unified multi-protocol network traffic generation and WAN emulation application. It allows users to generate real world customer traffic in a controllable manner. The WAN emulator allows the injection of latency and other network oddities like dropped, duplicated, and re-ordered packets. LANforge includes a drag-and-drop virtual network builder that supports virtual routers, WAN links, traffic-generating nodes, and more. It provides a scriptable command line interface with Perl libraries as well as a graphical user interface.
Tcl provides a portable scripting environment for Unix, Windows, and Macintosh that supports string processing and pattern matching, native file system access, shell-like control over other programs, TCP/IP networking, timers, and event-driven I/O. Tcl has traditional programming constructs like variables, loops, procedures, namespaces, error handling, script packages, and dynamic loading of DLLs. Tk provides portable GUIs on UNIX, Windows, and Macintosh. A powerful widget set and the concise scripting interface to Tk make it a breeze to develop sophisticated user interfaces.
pftp allows you to send and receive files and directories recursively, send and receive standard input and ouput, filter your connection, set the net buffer size, set the bandwidth, send UDP datagrams unicasted, broadcasted, and multicasted (which is meant for AUDIO and VIDEO streaming), send data to another user and manage that data, perform a network test based on either UDP or TCP, and use optimized buffers for your Gigabit Ethernet links. pftp can start from command line, as a daemon, or by inetd. All features are supported for IPv4 and IPv6.