DHCP : Configure DHCP Server2024/11/01

	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 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

success
[root@dlp ~]#

firewall-cmd --runtime-to-permanent

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 4
-rw-r--r--. 1 dhcpd dhcpd   0 Jan 24 09:00 dhcpd6.leases
-rw-r--r--. 1 dhcpd dhcpd 620 Apr 25 13:56 dhcpd.leases
-rw-r--r--. 1 dhcpd dhcpd   0 Jan 24 09:00 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-4.4.3-P1

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

server-duid "\000\001\000\001-\274\236\320RT\000\211\033\275";

lease 10.0.0.250 {
  starts 4 2024/04/25 04:56:19;
  ends 4 2024/04/25 05:06:19;
  cltt 4 2024/04/25 04:56:19;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 00:0c:29:e5:f5:43;
  uid "\001\000\014)\345\365C";
  set vendor-class-identifier = "MSFT 5.0";
  client-hostname "RX-0";
}
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