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Emulab FAQ: Hardware Setup: Can I do traffic shaping on my links?

Yes! You can specify the delay, bandwidth, and packet loss rate between any two nodes in your topology. Bandwidth and delay are specified in the NS duplex-link statement, while packet loss rate is specified with the Emulab tb-set-link-loss extension to NS. You may also specify delay, bandwidth, and packet loss rate between nodes in a regular LAN.

Please see the Extensions page for a summary of all Emulab NS extensions, and the Emulab Tutorial for an example.