Endace Measurement Systems Limited
http://www.endace.com
EDM01.05-04r1 DAG 3.6GE User Manual
Copyright, all rights reserved.
15
Revision 7. 22 September 2005.
4.0 RUNNING DATA CAPTURE SOFTWARE
Introduction
For a typical measurement session, ensure the driver is loaded, the
firmware has been downloaded, and the card has been configured.
In this chapter
This chapter covers the following sections of information.
•
Starting Capture Session
•
High Load Performance
4.1 Starting Capture Session
Description
The various tools used for data capture are in the
tools
sub-directory.
For a typical measurement session, ensure the driver is loaded, the
firmware has been downloaded, and the card is configured.
The integrity of the card’s physical layer is then set and checked.
Process
Starting a data capture session is described in the following process.
Process Description
Setting capture session
parameters
Parameters are set with
dagthree
.
The card can operate in two modes, variable
length capture (
varlen
), and fixed length
capture (
novarlen
).
In variable length capture mode, a maximum
capture size is set with
slen=N
bytes. This
figure should be in the range 32 to 2044 and is
rounded down to the nearest multiple of 4.
Packets longer than slen are truncated. Packets
shorter than slen will produce shorter records,
saving bandwidth and storage space. Full packet
capture for example:
tools/dagthree –d dag0 varlen
slen=1536
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