2. Measurements to be taken
One of the most important aspects of metrology is knowing what you want to characterize, in order to choose the right metrics, models and architectures. The IETF and ITU define a set of relevant metrics for evaluating network parameters, from a deterministic point of view for the IETF, and from a probabilistic point of view for the ITU. A large number of metrics are standardized thanks to the IETF IPPM (IP Performance Metrics) group, including fundamental metrics :
connectivity ;
unidirectional or bidirectional measurement of delays or losses;
delay variation (also known as "jitter");
packet duplication.
The IETF has also standardized derived metrics :
reasons...
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Measurements to be taken
Measurement architectures
Bibliography
Software tools
• Aurora: Traffic analysis and visualization (IBM) http://www.zurich.ibm.com/aurora/
• Nagios http://www.nagios.org
• Ipanema http://www.ipanematech.com
...Websites
• CAIDAThe Cooperative Association for Internet Data Analysis http://www.caida.org/home
• IANAInternet Assigned Numbers Authority http://www.iana.org
• RIPE NCCRIPE (Réseaux IP Européens) Network Coordination Centre
Standards and norms
- Recommendation G.1010 End-user multimedia QoS categories - G.1010 - ITU-T - 2001
- « Network model for evaluating multimedia transmission performance over Internet Protocol », ITU-T Recommendation G.1050 - G.1050 - ITU-T - 11-05
- The Internet Engineering Task Force http://www.ietf.org - IETF -
- Simple Network Management Protocol (SNMP) http://www.ietf.org - RFC 1157 -
- Chimento, P. and J....
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