tcpdchk and tcpdmatch appear to be missing from the tcp_wrappers rpm included with the RH7 release. I could not determine from the literature if this was intentional.
The 6.2 RPM included /usr/sbin/tcpdchk, and I as well have missed it's inclusion in 7.0.
The removal was intentional. * Mon Aug 14 2000 Jeff Johnson <jbj> - remove utilities that expect /etc/inetd.conf (#16059). Not the cleanest solution, but that is another story I suppose..