DHCP : Configure DHCP Server2023/02/21

	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

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 Aug 10 05:14 dhcpd6.leases
-rw-r--r--. 1 dhcpd dhcpd 617 Jan 11 10:50 dhcpd.leases
-rw-r--r--. 1 dhcpd dhcpd   0 Aug 10 05:14 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-4.4.2b1

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

server-duid "\000\001\000\001)o\235\357RT\000\337\207\255";

lease 10.0.0.233 {
  starts 2 2022/01/11 01:50:28;
  ends 2 2022/01/11 02:00:28;
  cltt 2 2022/01/11 01:50:28;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 00:0c:29:f3:7b:12;
  uid "\001\000\014)\363{\022";
  set vendor-class-identifier = "MSFT 5.0";
  client-hostname "RX-78";
}
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