Many people (including me) are writing RPMs for the ISC DHCP server and client version 3.0b1pl0, but they cannot be uploaded to contrib.redhat.com, perhaps because of bugs in the scripts that determine whether this is a newer release of what is already in contrib.redhat.com, BUT there is no provision in Bugzilla to notify Red Hat folks of this problem. Hence Red Hat users are deprived of a decent DHCP server and client.
Please address this problem to the email address ftp. The sysadmins here monitor that address and will be able to look into your problem.