I've used D-ITG also, great for simulation of VOIP/SIP traffic.
One other tools that has a longer history Mgen/Drec. Just like ITG you will need sync clocks between sender ( mgen ) and receiver ( drec ). Both pkgs allows for creation by src/dst/port/ttl/pps/kbps/etc........... Mgen was mainly used for multicast generation hence the name mGen, but it does support unicast flows also. Using udp you can easily obtain one-way latency results. Also you can watch how certain task effect latency. i.e copy tftp flash: on a cisco router will cause the latency to growth on very low end routers ;) or squezze a flash partition: btw, if your very strong in scripting both pkgs are easy to script for automation and controls. Hope this helps.
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