DOI: 10.21227/0bas-ph47
title: CRAWDAD dartmouth/campus  (v. 2004-08-05)

description: This dataset includes measurement trace for over 450 access points and several thousand users at dartmouth college.last modified :2007-01-31release date :2004-08-05date/time of measurement start :2001-04-11date/time of measurement end :2004-06-30collection 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 systlog 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/IP 
            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.Tracesetdartmouth/campus/movementTwo-year records showing the location (AP association) of each wireless card seen on campus.files: movement.tgzdescription: Over three years of nearly continuous records showing the location (access-point association) of each wireless card seen on campus. We used this data for our study of location predictors, published in [INFOCOM'04 paper] and a subsequent, expanded [technical report]. This data is derived from the syslog data. The trace used for this paper is gzipped tar file [51MB].measurement purpose: User Mobility Characterizationmethodology: We extracted user traces from dartmouth/campus/syslog. Each user's trace is a series of locations, that is, access-point names. We introduced the special location 'OFF' to represent the user's departure from the network (which occurs when the user turns off their computer or their wireless card, or moves out of range of all access points). The traces varied widely in length (the number of locations in the sequence). Users with longer traces were either more active (using their card more), more mobile (thus changing access points more often), or used the network for a longer period (some users have been on the network since April 2001, and some others have only recently arrived on campus).sanitization: same as dartmouth/campus/sysloglast modified: 2006-11-14dataname: dartmouth/campus/movementversion: 20040805change: Infocom 2004 trace is added.release date: 2004-08-05limitation: same as dartmouth/campus/sysloghole: same as dartmouth/campus/syslogdartmouth/campus/movement Tracesinfocom04: Two-year records showing the location (AP association) of each wireless card seen on campus.configuration: This trace is derived from the trace dartmouth/campus/syslog/01_04.format: timestamp, associated APdescription: Over two years of nearly continuous records showing the location (access-point association) of each wireless card seen on campus. We used this data for our study of location predictors, published in [INFOCOM'04 paper] and a subsequent, expanded [technical report]. This data is derived from the syslog data. The trace used for this paper is gzipped tar file [51MB]. .last modified: 2006-11-14dataname: dartmouth/campus/movement/infocom04version: 20040805change: Infocom04 movement trace is newly createdrelease date: 2004-08-05url: /download/dartmouth/campus/movement/movement.tgz