Best way to test QoS scenarios in a lab environment

[shikamarunara]

I have a frame relay/PSTN/telephony network configured in a lab and I would like to test out QoS syntax in different congested-link situations.  Can anyone recommend a method or device that will generate traffic, enough traffic to saturate a frame or ethernet link?

[andrew.prince]

ping

[Joseph W. Doherty · Accepted solution]

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I've used the freebie PCATTCP.  It can optionally generate UDP traffic at rate you specify.  I've used it to easily saturate a DS3.