Chapter 24. DHCP
Chapter 24. DHCP The dhcpd daemon is used in Red Hat Enterprise Linux to dynamically deliver and configure Layer 3 TCP/IP details for clients. The dhcp package provides the DHCP server and the dhcpd daemon. Enter the following command to see if the dhcp package is installed: If it is not installed, use the yum utility as root to install it: 24.1. DHCP and SELinux When dhcpd is enabled, it runs confined by default. Confined processes run in their own domains, and are separated from other confined processes. If a confined process is compromised by an attacker, depending on SELinux policy configuration, an attacker's access to resources and the possible damage they can do is limited. The following example demonstrates dhcpd and related processes running in their own domain. This example assumes the dhcp package is installed and that the dhcpd service has been started: Run the getenforce command to confirm SELinux is running in enforcing mode: The command returns Enforcing when SELinux is running in enforcing mode. Enter the following command as the root user to start dhcpd : Confirm that the service is running. The output should include the information below (only the time stamp will differ): Run following command to view the dhcpd processes: The SELinux context associated with the dhcpd process is system_u:system_r:dhcpd_t:s0 .
~]# rpm -q dhcp package dhcp is not installed ~]# yum install dhcp ~]USD getenforce Enforcing ~]# systemctl start dhcpd.service ~]# systemctl status dhcpd.service dhcpd.service - DHCPv4 Server Daemon Loaded: loaded (/usr/lib/systemd/system/dhcpd.service; disabled) Active: active (running) since Mon 2013-08-05 11:49:07 CEST; 3h 20min ago ~]USD ps -eZ | grep dhcpd system_u:system_r:dhcpd_t:s0 5483 ? 00:00:00 dhcpd