Solange Lima, Paulo Carvalho, Vasco Freitas
Universidade do Minho
Departamento de Informática
P-4710-057 Braga, Portugal
Tel.: +351 253 604430
Fax.: +351 253 604471
E-mail: {solange,pmc,vf} (at) di.uminho.pt
This paper explores the use of edge-to-edge active monitoring to
control simultaneously multiple QoS parameters in multi-service IP
networks, while reducing the effects of intrusion on real traffic.
Considering a multi-class domain where traffic is controlled at
network boundaries based on feedback from on-line measurements,
the present work is centered on obtaining adequate per class in-band
probing streams so that each class behaviour is correctly captured,
even if more than a QoS metric is under control.
In this way, we investigate distinct properties of probing patterns and
cross-check probing and passive measurement results in order
to assess and tune probing effectiveness.
To enhance probing ability to sense multiple metrics, we explore
Active Queue Management effects on probes and their different
probability of reaching the network boundary.
The results show that, while IPTD can be easily captured using a
very low probing rate, matching ipdv and IPLR is not straightforward.
However, we found that choosing a convenient drop precedence for
probing packets, the simultaneous estimation of these QoS metrics
can be significantly improved.