CentOS 8
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DHCP : Configure DHCP Server
2019/10/02
 
Configure DHCP ( Dynamic Host Configuration Protocol ) Server to assign IP addresses to client hosts in local network.
[1] Install and Configure DHCP. On this example, it shows only for IPv4 configuration.
[root@dlp ~]#
dnf -y install dhcp-server
[root@dlp ~]#
vi /etc/dhcp/dhcpd.conf
# create new

# specify domain name

option domain-name     "srv.world";
# specify DNS server's hostname or IP address

option domain-name-servers     dlp.srv.world;
# default lease time

default-lease-time 600;
# max lease time

max-lease-time 7200;
# this DHCP server to be declared valid

authoritative;
# specify network address and subnetmask

subnet 10.0.0.0 netmask 255.255.255.0 {
    # specify the range of lease IP address
    range dynamic-bootp 10.0.0.200 10.0.0.254;
    # specify broadcast address
    option broadcast-address 10.0.0.255;
    # specify gateway
    option routers 10.0.0.1;
}

[root@dlp ~]#
systemctl enable --now dhcpd

[2] If Firewalld is running, allow DHCP service. DHCP Server uses [67/UDP].
[root@dlp ~]#
firewall-cmd --add-service=dhcp --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
[3] It's possible to see leased IP address in the file below from DHCP Server to DHCP Clients.
[root@dlp ~]#
ll /var/lib/dhcpd

total 40
-rw-r--r-- 1 dhcpd dhcpd     0 Apr 24 23:16 dhcpd6.leases
-rw-r--r-- 1 dhcpd dhcpd 19311 Aug  5 14:49 dhcpd.leases
-rw-r--r-- 1 dhcpd dhcpd 18144 Aug  5 14:19 dhcpd.leases~

[root@dlp ~]#
cat /var/lib/dhcpd/dhcpd.leases

# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.3.6

# authoring-byte-order entry is generated, DO NOT DELETE
authoring-byte-order little-endian;

lease 10.0.0.218 {
  starts 3 2020/08/05 05:47:54;
  ends 3 2020/08/05 05:57:54;
  cltt 3 2020/08/05 05:47:54;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 00:0c:29:e1:f2:53;
  uid "\377+\2244\301\000\002\000\000\253\021\011\215\353J2\\\322\272";
  client-hostname "dlp";
}
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