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ns2 is network simulator 2... it is a open source software... used in linux to simulate and test various networks, their topologies, congestion etc........
# Terrestrial, satellite and wireless networks with various routing algorithms (DV, LS, PIM-DM, PIM-SM, AODV, DSR).
# Traffic sources like web, ftp, telnet, cbr, stochastic traffic.
# Failures, including deterministic, probabilistic loss, link failure, etc.
# Various queuing disciplines (drop-tail, RED, FQ, SFQ, DRR, etc.) and QoS (e.g., IntServ and Diffserv).
Visualize:
# Packet flow, queue build up and packet drops.
# Protocol behavior: TCP slow start, self-clocking, congestion control, fast retransmit and recovery.
# Node movement in wireless networks.
# Annotations to highlight important events.
# Protocol state (e.g., TCP cwnd).
If you're gonna use the NS2 software on windows, be sure to restart the computer after every step, or else nothing's gonna work.. it'll drive you crazy..
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