HELP: Traffic data Location

Hi, I would like to ask where I can find the database in which recording the traffic data in the real network (e.g., Lan or Wan, VBR video etc.) I am doing some simulation study based on the emperical data which is greatly important for my research on traffic modeling. I have read some papers from BellLab, MIT and IBM, however I am not sure the detailed location and I can download with the anonymous user. Anyone can help me? Thanks, Zhang Peng