3. why not one-way trip time measurements?

• our goal: large scale measurement of network topology,
  with correlation across many paths (tens of thousands)
• no such infrastructure for one-way transit time measurements
• another project doing one-way transit time measurements
  (Stephen Donnelly from U. Waikato, NZ; SDSC) http://atm.cs.waikato.ac.nz/atm/