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Do Not Use Dynamic DNS To prevent the DHCP server from receiving DNS information from clients, edit '/etc/dhcp/dhcpd.conf', and add or correct the following global option: 'ddns-update-style none;'

Deny Decline Messages Edit '/etc/dhcp/dhcpd.conf' and add or correct the following global option to prevent the DHCP server from responding the DHCPDECLINE messages, if possible: 'deny declines;'

Deny BOOTP Queries Unless your network needs to support older BOOTP clients, disable support for the bootp protocol by adding or correcting the global option: 'deny bootp;'

Configure Logging Ensure that the following line exists in '/etc/rsyslog.conf': 'daemon.* /var/log/daemon.log' Configure logwatch or other log monitoring tools to summarize error conditions reported by the dhcpd process.

Disable DHCP Client For each interface on the system (e.g. eth0), edit '/etc/sysconfig/network-scripts/ifcfg-interface' and make the following changes: Correct the BOOTPROTO line to read: BOOTPROTO=none Add or correct the following lines, substituting the appropriate values based on your site's addressing scheme: NETMASK=255.255.255.0 IPADDR=192.168.1.2 GATEWAY=192.168.1.1

Enable the NTP Daemon The 'ntpd' service can be enabled with the following command: '$ sudo systemctl enable ntpd'

Specify a Remote NTP Server To specify a remote NTP server for time synchronization, edit the file '/etc/ntp.conf'. Add or correct the following lines, substituting the IP or hostname of a remote NTP server for

Specify Additional Remote NTP Servers Additional NTP servers can be specified for time synchronization in the file '/etc/ntp.conf'. To do so, add additional lines of the following form, substituting the IP address or hostname of a remote NTP server for

Enable Postfix Service The Postfix mail transfer agent is used for local mail delivery within the system. The default configuration only listens for connections to the default SMTP port (port 25) on the loopback interface (127.0.0.1). It is recommended to leave this service enabled for local mail delivery. The 'postfix' service can be enabled with the following command: '$ sudo systemct ...

Uninstall Sendmail Package Sendmail is not the default mail transfer agent and is not installed by default. The 'sendmail' package can be removed with the following command: '$ sudo yum erase sendmail'


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