This data set is a joint project between NLANR PMA and the Internet Traffic Research group lead by Bill Cleveland. The data set was collected with a Dag3.2E 10/100 MBit/sec Ethernet card at the outside of the firewall servicing researchers at Bell Labs via a 9 MBits/sec link to the Internet. The Dag3.2E is sychronzed to a Praecis Ct CDMA time receiver, with an absolute accuracy to UTC to within 10 microseconds, the frequency stability comparable to GPS-based solutions. A log file of the timekeeping precision of the DUCK timestamping engine can be found here.

The following parameters are known:

• 100BaseTX link serving local network with firewall on one side and gateway router on the other
• gateway link to ISP is configured at 9 MBits/sec
• local network hosts serve 400 people, mostly technical, and about 50 administrative staff
• all HTTP traffic has clients inside network and servers outside
• all flows are bidirectional, routing is fully symmetric

Traces are available both via FTP and HTTP:

• http://pma.nlanr.net/Traces/Traces/long/bell/1/
• ftp://pma.nlanr.net/traces/long/bell/1/

MD5 checksums for all trace files are here.

Day	Volume (gzip compressed)
20020519	280MB
20020520	528MB
20020521	517MB
20020522	708MB
20020523	652MB
20020524	473MB
20020525	379MB