pkg://tcpdump-3.8.2-6.FC2.1.i386.rpm:361470/HEADER  downloads

Name        : tcpdump                      Relocations: /usr 
Version     : 3.8.2                             Vendor: Red Hat, Inc.
Release     : 6.FC2.1                       Build Date: Tue Nov  2 17:06:26 2004
Install date: (not installed)               Build Host: tweety.build.redhat.com
Group       : Applications/Internet         Source RPM: tcpdump-3.8.2-6.FC2.1.src.rpm
Size        : 741907                           License: BSD
Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
URL         : http://www.tcpdump.org
Summary     : A network traffic monitoring tool.
Description :
Tcpdump is a command-line tool for monitoring network traffic.
Tcpdump can capture and display the packet headers on a particular
network interface or on all interfaces.  Tcpdump can display all of
the packet headers, or just the ones that match particular criteria.

Install tcpdump if you need a program to monitor network traffic.