[Dataset] ucsd/sigcomm2001 (v. 2002-04-23)

top

The initial version

@MISC{ucsd-sigcomm2001-2002-04-23,
  author = {Anand Balachandran and Geoffrey M. Voelker and Paramvir Bahl and P. Venkat Rangan},
  title = {{CRAWDAD} data set ucsd/sigcomm2001 (v. 2002-04-23)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/ucsd/sigcomm2001},
  month = apr,  
  year = 2002
}
					

This dataset includes SNMP and tcpdump records from 4 access points at a three-day computer-science conference.

We recorded over three days at the ACM SIGCOMM'01 conference held 
at U.C. San Diego in August 2001. 
The conference was held on two full days, a Wednesday and Thursday, 
and one half day, a Friday.  The scheduled times of the conference 
on each day are as follows: 8:00-18:00 for the full days, and 
8:00-14:00 on the half day.

Our wireless LAN was an IEEE 802.11b network installed in a
large auditorium where the conference sessions were held. 
The auditorium has dimensions of 110x60x27 ft and was covered by 
four ORiNOCO AP-1000 wireless access points, labeled NorthEast (NE), 
NorthWest (NW), SouthEast (SE), and SouthWest (SW), installed in the ceiling.
The APs provided overlapping coverage in the auditorium and
the lobby. The western APs were close to the stage. 
The eastern APs were at the back of the room close to the main entrances, 
also providing coverage to the lobby. The subnet of APs was connected
to a Cisco Catalyst 2924 switch over a 100BaseT link, which connected
to the venue's intranet, then the campus gigabit backbone,
and finally to the Internet. The APs were operating at a data rate of
11 Mbps, on channels 1, 4, 7, and 11, and at a power of 100mW.
The AP handoff algorithm was configured to use 'small' cells.
The wireless user community consisted of 195 distinct users (distinct
MAC addresses), roughly 40% of the total attendees. User
wireless hardware was heterogeneous, as attendees used their own
personal wireless cards, and the trace includes traffic from 8 different
vendors.

The collected data consists of two parts. The first part is a record of 
SNMP performance monitoring data sampled from wireless access points 
(APs) serving the conference. The second part is a tcpdump trace 
consisting of anonymized packet headers of all wireless traffic. 
Both parts of the trace span all three days of the conference, capturing 
the workload of about 300,000 flows from 195 users consuming 4.6 GB 
of bandwidth.

We anonymized the tcpdump trace using tcpdpriv to remove all sensitive 
information including, packet payloads and IP addresses in packet headers.

[Traceset] ucsd/sigcomm2001/snmp (v. 2002-04-05)

top

The initial version

@MISC{ucsd-sigcomm2001-snmp-2002-04-05,
  author = {Anand Balachandran and Geoffrey M. Voelker and Paramvir Bahl and P. Venkat Rangan},
  title = {{CRAWDAD} trace set ucsd/sigcomm2001/snmp (v. 2002-04-05)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/ucsd/sigcomm2001/snmp},
  month = apr,  
  year = 2002
}
					

This traceset includes SNMP records from 4 access points at a three-day computer-science conference.

We collected a continuous trace of SNMP data from each of 
the four APs over a period of 52 hours from the start of 
the conference. The SNMP data consisted of aggregate
packet level statistics of all traffic through both interfaces of
the APs, including information at the link, network, and transport
levels. In addition, the trace also contained detailed information
about the mobile users associated to each of the APs, including the
MAC address, the received signal-to-noise ratio (SNR), and 
the effective throughput.

[Traceset] ucsd/sigcomm2001/tcpdump (v. 2004-11-09)

top

The initial version

@MISC{ucsd-sigcomm2001-tcpdump-2004-11-09,
  author = {Anand Balachandran and Geoffrey M. Voelker and Paramvir Bahl and P. Venkat Rangan},
  title = {{CRAWDAD} trace set ucsd/sigcomm2001/tcpdump (v. 2004-11-09)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/ucsd/sigcomm2001/tcpdump},
  month = nov,  
  year = 2004
}
					

This traceset includes tcpdump records from the wireless network at a three-day computer-science conference.

We recorded the networklevel headers of the packets passing 
through the Cisco Catalyst 2924 switch for the duration of 
the conference.

We used tcpriv to anonymize sensitive information like sender 
and receiver IP addresses to protect user privacy, and discarded 
all packet payloads.

[Trace] ucsd/sigcomm2001/snmp/Stations (v. 2002-04-05)

top

The initial version

@MISC{ucsd-sigcomm2001-snmp-Stations-2002-04-05,
  author = {Anand Balachandran and Geoffrey M. Voelker and Paramvir Bahl and P. Venkat Rangan},
  title = {{CRAWDAD} trace ucsd/sigcomm2001/snmp/Stations (v. 2002-04-05)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/ucsd/sigcomm2001/snmp/Stations},
  month = apr,  
  year = 2002
}
					

This trace includes SNMP records for the stations associated with 4 access points at a three-day computer-science conference.

This trace contains 12 trace files. Those files are 
named Stations_%AP_Name%_%Day%.out -- where %AP_Name% 
can be one of NE, NW, SE, or SW; and %Day% can be Wed, Thu, 
or Fri. Thus the trace file for the NE AP on Wednesday, 
is Stations_NE_Wed.out. The SNMP OID used to generate these 
trace files was .1.3.6.1.4.1, which corresponds to the MIB 
entry for "Associated Stations" and gives the MAC address, 
average received SNR, total transmitted bytes, and total 
transmitted packets for each mobile station associated to 
the AP. 
Each poll entry begins with a timestamp and entries from 
successive polls are separated by the line "End of MIB subtree".

The trace-collection routine polled the APs at one minute intervals.

[Trace] ucsd/sigcomm2001/snmp/AP_Mibtree (v. 2002-04-05)

top

The initial version

@MISC{ucsd-sigcomm2001-snmp-AP_Mibtree-2002-04-05,
  author = {Anand Balachandran and Geoffrey M. Voelker and Paramvir Bahl and P. Venkat Rangan},
  title = {{CRAWDAD} trace ucsd/sigcomm2001/snmp/AP_Mibtree (v. 2002-04-05)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/ucsd/sigcomm2001/snmp/AP_Mibtree},
  month = apr,  
  year = 2002
}
					

This trace includes SNMP records for 4 access points at a three-day computer-science conference.

This trace contains 12 trace files. Those files are named
AP_%AP_Name%_%Day%.out -- where %AP_Name% can be one of 
NE, NW, SE, or SW; and %Day% can be Wed, Thu, or Fri. 
Thus the trace file for the NE AP on Wednesday, is 
AP_NE_Wed.out. These files were generated using the 
SNMP OID .1.3.6.1.2.1, which walks the entire MIB tree. 
Each poll begins with a timestamp and ends with the line 
"End of MIB subtree". These trace files contain all 
information recorded at the AP at the MAC, network, 
transport, and application layers. For example, 
the number of total unicast and multicast packets (bytes) 
transmitted and recevied, the number of unicast and 
multicast MAC-level errors and retransmissions, etc.

The APs are polled at one-minute intervals.

[Trace] ucsd/sigcomm2001/tcpdump/08292005 (v. 2002-04-23)

top

The initial version

@MISC{ucsd-sigcomm2001-tcpdump-08292005-2002-04-23,
  author = {Anand Balachandran and Geoffrey M. Voelker and Paramvir Bahl and P. Venkat Rangan},
  title = {{CRAWDAD} trace ucsd/sigcomm2001/tcpdump/08292005 (v. 2002-04-23)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/ucsd/sigcomm2001/tcpdump/08292005},
  month = apr,  
  year = 2002
}
					

This trace includes tcpdump records from the wireless network at a three-day computer-science conference.

tcpdump format

The trace represents a collection of all the wireless 
IP traffic over the entire period of the conference.

[Tool] tools/collect/snmp/snmputil.exe (v. 2002-04-05)

top

NAME CHANGED to tools/collect/snmp/snmputil.exe. Also see 'old name' field.

@MISC{tools-collect-snmp-snmputil.exe-2002-04-05,
  author = {Anand Balachandran},
  title = {{CRAWDAD} tool tools/collect/snmp/snmputil.exe (v. 2002-04-05)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/tools/collect/snmp/snmputil.exe},
  month = apr,  
  year = 2002
}
					

The snmputil tool is a command-line utility that uses the standard Win32 SNMP Management API.

SNMP files whose format is the same as those of 
				ucsd/sigcomm2001/snmp/Stations and ucsd/sigcomm2001/snmp/AP_Mibtree.

option[get|getnext|walk] node_address password snmp_oid

The usage for snmputil is: 
snmputil option[get|getnext|walk] node_address password snmp_oid
For example, to walk the entire MIB tree at the AP, the usage is: 
snmputil walk AP_IP_address password .1.3.6.1.2.1

The snmputil tool is a command-line utility that uses the standard 
Win32 SNMP Management API. The source-code consists of one 
source file (snmputil.c) and a makefile. If you are building 
snmputil.exe on your own, make sure that you have the Windows SNMP 
libraries, snmpapi.lib and mgmtapi.lib.

[Tool] tools/process/snmp/extract.pl (v. 2002-04-05)

top

NAME CHANGED to tools/process/snmp/extract.pl. Also see 'old name' field.

@MISC{tools-process-snmp-extract.pl-2002-04-05,
  author = {Anand Balachandran},
  title = {{CRAWDAD} tool tools/process/snmp/extract.pl (v. 2002-04-05)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/tools/process/snmp/extract.pl},
  month = apr,  
  year = 2002
}
					

This tool generates the data matching the pattern given by the users

SNMP trace obtained by snmputil

data matching the pattern given by the users

The extract.pl script can be used to parse all SNMP output files 
in the trace to look for a certain pattern. The pattern may be 
a phrase representing all or part of an SNMP OID, or simply text 
that appears in the trace file. The script has detailed comments 
on how to use it. Since we collected the SNMP data using snmputil, 
the scripts are written specifically to parse that output. 
The traces contain the SNMP data collected at one-minute intervals, 
and extract.pl uses these timestamps in the trace file to parse 
the data. Since each SNMP OID has a unique entry in the trace, 
extract.pl can be used to extract the values of all the SNMP 
variables over the entire duration of the trace.

[Tool] tools/analyze/snmp/index.pl (v. 2002-04-05)

top

NAME CHANGED to tools/analyze/snmp/index.pl. Also see 'old name' field.

@MISC{tools-analyze-snmp-index.pl-2002-04-05,
  author = {Anand Balachandran},
  title = {{CRAWDAD} tool tools/analyze/snmp/index.pl (v. 2002-04-05)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/tools/analyze/snmp/index.pl},
  month = apr,  
  year = 2002
}
					

This tool returns number of users as a function of time

output of extract.pl

number of users as a function of time

Once the SNMP traces have been processed using extract.pl, 
index.pl returns number of users as a function of time.

[Tool] tools/analyze/snmp/mac_addr.pl (v. 2002-04-05)

top

NAME CHANGED to tools/analyze/snmp/mac_addr.pl. Also see 'old name' field.

@MISC{tools-analyze-snmp-mac_addr.pl-2002-04-05,
  author = {Anand Balachandran},
  title = {{CRAWDAD} tool tools/analyze/snmp/mac_addr.pl (v. 2002-04-05)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/tools/analyze/snmp/mac_addr.pl},
  month = apr,  
  year = 2002
}
					

This tool lists time instances of occurrence of a particular mac-addresses

output of extract.pl

time instances of occurrence of a particular mac-addresses

Once the SNMP traces have been processed using extract.pl, 
mac_addr.pl returns time instances of occurrence of a particular mac-addresses.

[Tool] tools/analyze/snmp/pick_mac_addr.pl (v. 2002-04-05)

top

NAME CHANGED to tools/analyze/snmp/pick_mac_addr.pl. Also see 'old name' field.

@MISC{tools-analyze-snmp-pick_mac_addr.pl-2002-04-05,
  author = {Anand Balachandran},
  title = {{CRAWDAD} tool tools/analyze/snmp/pick_mac_addr.pl (v. 2002-04-05)}, 
  howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/tools/analyze/snmp/pick_mac_addr.pl},
  month = apr,  
  year = 2002
}
					

This tool lists unique mac-addresses in the trace file

output of extract.pl

listing of unique mac-addresses in the trace file

Once the SNMP traces have been processed using extract.pl, 
pick_mac_addr.pl returns listing of unique mac-addresses in the trace file

[Author] Anand Balachandran

top

[Author] Geoffrey M. Voelker

top

[Author] Paramvir Bahl

top

[Author] P. Venkat Rangan

top

[Paper] bahl-breathing

top

[Paper] balachandran-behavior

top

This paper presents and analyzes user behavior and network performance in a 
public-area wireless network using a workload captured at a well-attended ACM 
conference. The goals of our study are: (1) to extend our understanding of 
wireless user behavior and wireless network performance; (2) to characterize 
wireless users in terms of a parameterized model for use with analytic and 
simulation studies involving wireless LAN traffic; and (3) to apply our 
workload analysis results to issues in wireless network deployment, such as 
capacity planning, and potential network optimizations, such as algorithms for 
load balancing across multiple access points (APs) in a wireless network.

[Paper] meng-flows

top

Several studies have recently been performed on wireless university campus 
networks, corporate and public networks. Yet little is known about the 
flow-level characterization in such networks. In this paper, we statistically 
characterize wireless network using a recently-collected trace. For static 
flows, we take a two-tier approach to characterizing the flow arrivals, which 
results a Weibull regression model. We further discover that the static flow 
arrivals in spatial proximity show strong similarity. As for roaming flows, 
they can also be well characterized statistically. We explain the results by 
user behaviors and application demands, and further crossvalidate the modeling 
results by three other traces. Finally, we use two examples to illustrate how 
to apply our models for performance evaluation in the wireless context.