Description of problem:
The info of arpwatch-2.1a13-21.el5.i386.rpm from RHEL5.4-Client-latest gives:
Group : Applications/System Source RPM: tcpdump-3.9.4-14.el5.src.rpm
The source RPM seems to be wrong - it should be arpwatch-2.1a13-21.el5.src.rpm.
Version-Release number of selected component (if applicable):
The arpwatch package really comes from tcpdump src.rpm. It was split after RHEL5 to tcpdump, libpcap and arpwatch packages.