Traffic Generator

Use an ALTSYNCRAM as a ROM block and initialize it with a suitable mif file with the bytes that you can cyclically read out from the ROM. It works well and it is simple to implement. ;)

hm...I was more thinking along the lines of a block that would output packets (with time stamp, src and dest info, and payload) following a certain size and time distribution.

You can get ALTSYNCRAM from altera mega-function wizard available in Quartus II

I can't find it...is it available on the Stratix II GX?

Open Quartus II, Open new Block diagram / schematic file, double click anywhere on block diagram window, a symbol window will be appeared, then write 'altsyncram' (without comma) in name field and click ok.