A description of the data is available at
http://ita.ee.lbl.gov/html/contrib/NPD-Routes.html
Briefly:
The first dataset, NPD-Routes-1, consists of 6,991 attempted
measurements made between 27 Internet sites, conducted from November 8,
1994, to December 24, 1994. Measurement failures appear in this dataset
as empty files. The second dataset, NPD-Routes-2, consists of 37,097
attempted measurements made between 33 sites, 23 in common with
NPD-Routes-1. These measurements were made from November 3, 1995, to
December 21, 1995. Measurement failures in this dataset have been
omitted, so there are 35,229 actual measurements present.