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The New NS2 Emulation Facility Kevin Fall kfall@ee.lbl

The New NS2 Emulation Facility Kevin Fall kfall@ee.lbl.gov. NS2 is the simulation vehicle for the VINT project: USC/ISI : Deborah Estrin, Mark Handley, John Heideman, Ahmed Helmy, Polly Huang, Satish Kumar, Kannan Varadhan, Daniel Zappala LBNL : Kevin Fall, Sally Floyd

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The New NS2 Emulation Facility Kevin Fall kfall@ee.lbl

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  1. The New NS2 Emulation FacilityKevin Fallkfall@ee.lbl.gov • NS2 is the simulation vehicle for the VINT project: • USC/ISI: Deborah Estrin, Mark Handley, John Heideman, Ahmed Helmy, Polly Huang, Satish Kumar, Kannan Varadhan, Daniel Zappala • LBNL: Kevin Fall, Sally Floyd • UCBerkeley: Elan Amir, Steve McCanne • Xerox PARC: Lee Breslau, Scott Shenker • VINT is currently funded by DARPA through mid-1999

  2. ns2 Architecture • Discrete-event C++ simulation engine • scheduling, timers, packets • Based on ns1 (S. McCanne and V. Jacobson) • Split Otcl/C++ object “library” • protocol agents, links, nodes, classifiers, routing, error generators, traces, queuing, math support (random variables, integrals, etc) • separate visualization tool (“Nam”) • used on many UNIXes, tested on Windows

  3. Supported Components • Protocols: • tcp (2modes + variants), udp, ip, rtp/rtcp, SRM, 802.3 MAC, 802.11 MAC • Routing • global topology map, classifiers • static unicast, dynamic unicast (distance-vector), multicast • Queueing and packet scheduling • FIFO/drop-tail, RED, CBQ, WRR, DRR, SFQ • Topology: nodes, links Failures: link errors/failures • Emulation: plug simulator into live network

  4. New Emulation Facility(note: still under active development) • Generic which “tap” live networks • inject received packets into simulation • emit packets on to live network • associated with a “network object” • Network Objects • Raw IP and UDP/IP network object • send/receive raw IP packets or UDP/IP • IP multicast support • pcap network object • send/receive link-layer frames • use tcpdump/pcap filtering language

  5. Sample Environment Proxy ARP for Laptop DHCP for address/routing Internet Emulation Machine Laptop

  6. Emulation Machine Simulator BPF BPF BPF RAW IP

  7. Sample Script set ns [new Simulator] $ns use-scheduler RealTime set me [exec hostname] set bpf0 [new Network/Pcap/Live] $bpf0 set promisc_ true set ipnet [new Network/IP] set nd0 [$bpf open readonly fxp0] $ipnet open writeonly set filt “(not ip host $me)” $bpf0 filter $filt set a0 [new Agent/Tap] $a0 network $bpf0 set n0 [$ns node] $ns attach-agent $n0 $a0

  8. TCP Results (10 packet periodic drop) Lost ACK of SYN+ACK Dropped SYN Retransmitted SYN

  9. Relevance to TCP-IMPL • Rich multi-protocol simulation environment • Modular structure easily extended • Traffic and error generation

  10. Additional Information • Web pages: • http://www-mash.cs.berkeley.edu/ns • http://netweb.usc.edu/vint • http://www.ito.darpa.mil/Summaries96/E247--USC_ISI.html • http://www.ito.darpa.mil/Summaries97/E243_0.html • Mailing list: • majordomo@mash.cs.berkeley.edu • “subscribe ns-users”

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