1 ns-2 Tutorial Haobo Yu, Nader Salehi USC/ISI

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Presentation transcript:

1 ns-2 Tutorial Haobo Yu, Nader Salehi USC/ISI

USC INFORMATION SCIENCES INSTITUTE 2 Overview Project goals and status What is ns History and status Seminar schedule

USC INFORMATION SCIENCES INSTITUTE 3 Goals VINT: Virtual InterNet Testbed A collaborative simulation platform Provide common reference  promote sharing Test suites  increase confidence in results Intended audience Researchers Developers Educators

USC INFORMATION SCIENCES INSTITUTE 4 What is NS Discrete event simulator Packet-level Link layer and up Wired and wireless

USC INFORMATION SCIENCES INSTITUTE 5 History and Status Columbia NEST UCB REAL ns-1 ns-2 100K lines of C++ 70K lines of OTcl 30K lines of test suite 20K lines of documentation

USC INFORMATION SCIENCES INSTITUTE 6 Platforms Most UNIX and UNIX-like systems FreeBSD or *BSD Linux Sun Solaris  HP, SGI Window 95/98/NT Some work, some does not (Emulation only for FreeBSD for now)

USC INFORMATION SCIENCES INSTITUTE 7 Related Research intserv/diffserv Multicast Routing Reliable multicast Transport TCP Congestion control Application Web caching Multimedia

USC INFORMATION SCIENCES INSTITUTE 8 Installation Getting the pieces Tcl/TK 8.x (8.0.5 preferred): OTcl, TclCL, ns-2, nam-1: Other utilities Tcl-debug, GT-ITM, xgraph, …

USC INFORMATION SCIENCES INSTITUTE 9 Getting Help ns-2 build questions (previously ns- “subscribe ns-users” in body Archive:

USC INFORMATION SCIENCES INSTITUTE 10 Resources Tcl (Tool Command Language) OTcl (MIT Object Tcl) ~otcl/doc/tutorial.html (in distribution) ns manual Included in distribution: ~ns/doc

USC INFORMATION SCIENCES INSTITUTE 11 Cautions People tried best to validate ns with regression tests However: abstraction of the real world is necessary for a simulator  You must justify the usage of this simulator based on your research goals

USC INFORMATION SCIENCES INSTITUTE 12 Workshop Goals Capability of the simulator Design and implementation Complete examples of its usage We try to avoid: Detailed research results

USC INFORMATION SCIENCES INSTITUTE 13 Workshop Schedule Day 1: OTcl-based simulations Fundamentals: wired and wireless worlds Supporting tools Lab Day 2: C++ and ns ns internal Extending ns Lab

USC INFORMATION SCIENCES INSTITUTE 14 History and Status Users from approximately 600 institutes 50 countries Releases Periodic releases (currently 2.1b6, Jan 2000) Nightly snapshots (probably compiles and works, but “unstable”) Available from: USC/ISI, UC Berkeley, UK mirror

USC INFORMATION SCIENCES INSTITUTE 15 Functionality of ns Wired world Point-to-point link, LAN Unicast/multicast routing Transport Application layer Wireless Mobile IP Ad hoc routing Tracing, visualization, various utilities