- One-way Measurement(Set1): In this measurement format, probes are
sent from a source up to a destination. This type of measurement supplies
simple metrics as results. As mentioned before, only the parameters not
relative to different clocks may be estimated by this way.
- Two One-way Measurement(Set2): To obtain measures considering
different clocks, it is necessary to send probes in two ways. In this
measurement module, two hosts send probes to each other. Two one-way probe
generations are started at the same time and in opposite direction. For this
reason the method is called Two one-way. With the variation in the
size of packets, this measurement format allows the application of algorithms
to remove Skew and Offset from the traces.
- Round-trip Measurement(Set3): In this option, the Tangram-II
Traffic Generator works like a Ping tool, but in an application layer
level. The Probes are sent from a network point to another host; when received
by this remote host, the packets are echoed (by the application) to the sender
again. It is important to note that in this format there is no problem with
clocks. The sending and receiving clocks are the same, given that the
timestamps are from the same machine.
Guilherme Dutra Gonzaga Jaime
2010-10-27
