How do I capture packets while CDRouter runs?
If you’re using BuddyWeb, capture files are automatically created for each individual test case that is executed. These capture files can be viewed directly in Firefox using Wireshark (formerly Ethereal).
Using buddy (CDRouter’s command line interface)
It’s also possible to have CDRouter capture packets when tests are
executed using buddy. To do this, use the
-capture option when you
run buddy. Using this option alone will create a capture file in the
present working directory for each interface used during the test run.
$ buddy -config myConfig.conf -module basic.tcl -trace -pt -capture
The capture files generated by buddy may be viewed using programs such as Wireshark (formerly Ethereal) or Tcpdump. For example, if you’re running the standard version of CDRouter, this will create two capture files, one for the WAN interface and one for the LAN interface, named start-wan.cap and start-lan.cap. If you’re running CDRouter Multiport, capture files will also be created for each additional interface you have configured.
Other options may be used in conjunction with
-capture to produce
more customized results. By using the
-logdir option, a directory
will be created containing capture files for each individual test run
and test rather than a single capture file containing packets captured
from all tests during a test run. This may be taken a step further by
also using the
-report-html option. This will create an HTML report
for your test run which includes links to the capture files generated
during the test run.
$ buddy -config myConfig.conf -module basic.tcl -trace -pt -logdir /home/foo/bar -report-html /home/foo/bar/report
When using the
-logdir option, you must specify a different
directory for each test run. Alternatively you can use the
option to delete/overwrite the existing log directory. In addition,
test comments can be added to the log files and HTML reports. For more
information see this Knowledge Base article
How can I add comments to the log file and HTML report?
-pt options are also commonly used when running
CDRouter tests with buddy. The
-trace option enables protocol trace
messages, and the
-pt option enables a one line summary of sent and
received packets. For more information on other buddy options, please
CDRouter User’s Guide.