Does anyone know of a suitable traffic generator like those used on training courses to simulate real traffic. It's essential to have one if you want to lab QoS / VoIP topics properly (for example traffic with different QoS markings).
The ONT suggested lab setup document here on cisco.com mentions the fact you should have one but doesn't list specifics. I've looked around more than once in the past but never found something suitable. I think that there is even a special IOS that does exactly this but can't find any reference to it!