Mtool 说明文档Mtool 说明文档.docVIP

? University of Naples ? Federico II ? ? ? ? ? 5 August, 2002 ? Copyright ? 2002: Stefano Avallone ? Permission is granted to use or distribute but not to sell ? Version 1.1: added a new distribution for packet generation process ? Mtools: an UDP traffic generator ? download ? Mtools is a collection of tools for measuring network performances. It is made up of two instruments: ? One-way-delay Meter Round-trip-time Meter ? Mtools works under Linux and FreeBSD operating systems. ? One-way-delay Meter ? One-way-delay Meter (OWDM) enables to send UDP packets to a specific host and measure the transmission time of each packet. All the information associated to each packet is stored in a log file, whose format is compliant with that of MGEN`s [1] log file, so it is possible to use MGEN`s powerful utilities to analyze log files and obtain statistics, delay and bit rate graphs and so on. OWDM main features are: it is easily extensible to support a wide variety of traffic source models, thanks to the Newran [2] random number generator library (included in Mtools distribution) it is possible to specify the seed value of the random process that generates packets inter-departures, so as to repeat many times the same realization of the packet generation random process (useful for comparing different network configurations) it is possible to generate randomly sized packets (and specify a seed value for this process) sender can record packets transmission times, so as to get the bit rate graph of generated traffic OWDM is constituted by a sender and a receiver. OWDM sender can be used both in script mode and command line mode. The syntax in script mode is: owdmSend script file [log file] where script file is the file that contains the specification of the flows to be generated (a flow for each line except blank lines and lines beginning with `#`). Each flow is assigned a flow identifier equal to the number of the line of the script file in which it is specified. Th