last modified

2009-09-09

reason for most recent change

AP locations in meter as of the end of 2008 have been added.

release date

2007-02-08

date/time of measurement start

2001-04-11

date/time of measurement end

2006-10-04

website

www.crawdad.org/dartmouth/campus

network type

802.11 infrastructure

collection environment

The Dartmouth College campus has over 190 buildings on 200 acres. Dartmouth College has about 5500 students and 1200 faculty, and during our study there were approximately 3200-3300 undergraduates on campus. Students are required to own a computer, and most purchase a computer through the campus computer store. Wireless laptops increasingly dominate those purchases, making up 45% of the total in 2000, 70% in 2001, 88% in 2002, and 97% in 2003. Assuming that students obtaining computers elsewhere choose laptops in the same proportion, we estimate that over 75% of the undergraduates owned laptops at the time of our study.

network configuration

476 Cisco 802.11b access points (APs) were installed in 2001 to cover most of the campus. Since then, APs have been added to increase coverage and to cover new construction, and there are currently 566 APs. The compact nature of the campus means that the signal range of interior APs extends to cover most of the campus' outdoor areas. All APs share the same SSID, allowing wireless clients to roam seamlessly between APs. On the other hand, a building's APs are connected to the building's existing subnet. The 188 buildings with wireless coverage span 115 subnets, so clients roaming between buildings may be forced to obtain new IP addresses. Clients obtain IP addresses using DHCP (lease times were 6 or 12 hours at different points in the trace).

data collection methodology

We used three techniques: syslog events, SNMP polls, and network sniffers (tcpdump). We also derived movement history data from the syslog data.

sanitization

All data has been sanitized to protect the privacy of our users. We have resanitized the data (2004-11-08) so that there is a consistent MAC address mapping and a consistent IP address mapping across all of the traces. In other words, the sanitized IP address 111.222.333.444 will correspond to the same raw IP address in all of our traces. Similarly, the sanitized MAC address aa:bb:cc:dd:ee:ff will always correspond to the same raw MAC address in all of our traces. Note that these may not represent the same physical device, due to DHCP, MAC spoofing, etc.

• David Kotz
  David.F.Kotz@Dartmouth.EDU
  Dartmouth College
  Computer Science
  Professor
  6211 Sudikoff Laboratory, Hanover, NH 03755-3510 USA
  603-646-1439
  206-339-3145
  www.cs.dartmouth.edu/~dfk
  
• Tristan Henderson
  tristan@cs.st-andrews.ac.uk
  University of St Andrews
  Computer Science
  Lecturer
  School of Computer Science, University of St Andrews, Fife KY16 9SX, UK
  +44 (0)1334 461 637
  +44 (0)1334 463 278
  www.cs.st-andrews.ac.uk/~tristan/
  
• Ilya Abyzov
  Dartmouth College
  Computer Science
  
• Jihwang Yeo
  Dartmouth College
  Computer Science
  Programmer
  6211 Sudikoff Laboratory, Hanover, NH 03755-3510 USA
  603-646-8746
  603-646-1672
  

When writing a paper that uses CRAWDAD datasets, we would appreciate it if you could cite both the authors of the dataset and CRAWDAD itself, and identify the exact dataset using the appropriate version number. For this dataset, this citation would look like:

David Kotz, Tristan Henderson, Ilya Abyzov, Jihwang Yeo, CRAWDAD dataset dartmouth/campus (v. 2009‑09‑09), downloaded from https://crawdad.org/dartmouth/campus/20090909, https://doi.org/10.15783/C7F59T, Sep 2009.

• Cite using BibTeX
• Cite using RIS

@misc{dartmouth-campus-20090909,
    author = {David Kotz and Tristan Henderson and Ilya Abyzov and Jihwang Yeo},
    title = {{CRAWDAD} dataset dartmouth/campus (v. 2009-09-09)},
    howpublished = {Downloaded from \url{https://crawdad.org/dartmouth/campus/20090909}},
    doi = {10.15783/C7F59T},
    month = sep,
    year = 2009
}

TY  - DATA
TI  - CRAWDAD dataset dartmouth/campus (v. 2009-09-09)
UR  - https://crawdad.org/dartmouth/campus/20090909
PY  - 2009/09/09/
AU  - David Kotz
AU  - Tristan Henderson
AU  - Ilya Abyzov
AU  - Jihwang Yeo
DO  - 10.15783/C7F59T
ER  -

If you do not use the provided citation formats, please include a reference with the same information, as described in the CRAWDAD FAQ.