SCNM User Guide

SCNM includes the following user-level tools for capture and analysis of packet headers:

• monitord: SCNM header collection daemon
• apc: activation packet control.
• fc2td: convert SCNM files to tcpdump format
• tcptrace: tcptrace tool
• SCNMPlot: SCNMPlot
• fc2xp and fc2xg: convert SCNM files to xplot or xgraph format

Quick Start Guide

The folllowing steps are used to activate SCNM captures:

• Start the data collector (monitord)

            monitord &
            

• Use the apc (Activation Packet Control) to send an activation packet to all SCNM hosts on the path.

            apc -dt www.abc.com 80
            

• Next, to look at the results you have several options:
  1. convert the SCNM data file to standard tcpdump format using fc2td, and then use tcptrace to generate desired data for xplot or SCNMPlot. For example:

                    % fc2td < ???.dat > scnm-tcpdump.dat
                    % tcptrace -Sl tcpdump.dat
                    % xplot a2b...xpl
                    or
                    SCNMPlot file1.xpl file2.xpl ...
                    

  2. use fc2xp to generate desired data for xplot. E.g.:

                    fc2xp -sn -s 2 VR555_???.dat | xplot
                    

  3. use fc2xg to generate desired data for xgraph. E.g.:

                    fc2xg -sn -s 2 VR555_???.dat | xgraph -m -nl