RHEL6のdhcpはISC DHCP

Red Hat Enterprise Linux 6 Deployment Guide より

12.2. Configuring a DHCP Server
The dhcp package contains an ISC DHCP server.

RHEL6 (CentOS6) での rpm -qi dhcp は以下のとおり。RHEL5 (CentOS5) でも普通にISC版だった。

Name        : dhcp                         Relocations: (not relocatable)
Version     : 4.1.1                             Vendor: CentOS
Release     : 12.P1.el6_0.4                 Build Date: Sat 25 Jun 2011 10:01:05 PM JST
Install Date: Wed 17 Aug 2011 02:19:24 AM JST      Build Host: c6b5.bsys.dev.centos.org
Group       : System Environment/Daemons    Source RPM: dhcp-4.1.1-12.P1.el6_0.4.src.rpm
Size        : 2142910                          License: ISC
Signature   : RSA/8, Wed 06 Jul 2011 10:38:02 AM JST, Key ID 0946fca2c105b9de
Packager    : CentOS BuildSystem <http://bugs.centos.org>
URL         : http://isc.org/products/DHCP/
Summary     : Dynamic host configuration protocol software
Description :
DHCP (Dynamic Host Configuration Protocol) is a protocol which allows
individual devices on an IP network to get their own network
configuration information (IP address, subnetmask, broadcast address,
etc.) from a DHCP server. The overall purpose of DHCP is to make it
easier to administer a large network.  The dhcp package includes the
ISC DHCP service and relay agent.

To use DHCP on your network, install a DHCP service (or relay agent),
and on clients run a DHCP client daemon.  The dhcp package provides
the ISC DHCP service and relay agent.