Notes to Myself

### DHCP Sunucunun Kurulumu:
dnf -y install dhcp-server

###  dhcpd.conf ###

[root@ns01 root]# cat /etc/dhcp/dhcpd.conf
#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp-server/dhcpd.conf.example
#   see dhcpd.conf(5) man page
#
#
option domain-name     “osinetworks.net”;
option domain-name-servers     ns1.osinetworks.net;

# Declare DHCP Server
authoritative;

# The default DHCP lease time
default-lease-time 86400;

# Set the maximum lease time
max-lease-time 604800;

subnet 192.168.10.0 netmask 255.255.255.0 {
    #range dynamic-bootp 192.168.10.200 192.168.10.210;
    ### Provide broadcast address
    #option broadcast-address 192.168.10.255;
    ### Provide NTP server
    #option ntp-servers 192.168.10.13;
    ### Set default gateway
    #option routers 192.168.10.1;
}

# Set Network address, subnet mask and gateway
subnet 192.168.20.0 netmask 255.255.255.0 {
    # Range of IP addresses to allocate
    range dynamic-bootp 192.168.20.10 192.168.20.100;
    ### Provide broadcast address
    option broadcast-address 192.168.20.255;
    ### Provide NTP server
    option ntp-servers 192.168.10.13;
    ### Set default gateway
    option routers 192.168.20.1;

    host server1{
        hardware ethernet 00:50:56:a2:7b:16;
        fixed-address  192.168.20.21;
    }

    host server2 {
        hardware ethernet 00:50:56:a2:10:c1;
        fixed-address  192.168.20.22;
    }

    host server3 {
        hardware ethernet 00:50:56:a2:f7:2a;
        fixed-address  192.168.20.23;
    }
}

log-facility local7;

### End of dhcpd.conf ###

### Starting the DHCP server. Enabled for startup.
systemctl start dhcpd
systemctl enable dhcpd

### Allow dhcp port permanently.
firewall-cmd –add-service=dhcp –permanent
firewall-cmd –reload         

### install dhcp-client test tool:
dnf -y install dhcp-client

### test via dhcpclient.
dhcplient ens33

### To control ip address and lease time.
tail -n 20 -f /var/log/messages
cat  /var/lib/dhcpd/dhcpd.leases