DHCP

Ubuntu

Install DHCP server

sudo apt install isc-dhcp-server

Configuration

Note: Prior to configurations, make sure the targeted interface card is properly setup. May need to assign a static gateway IP to the interface card.

1. Edit the file /etc/default/isc-dhcp-server

INTERFACESv4="eth0"

2. Define your DHCP server options

sudo vi /etc/dhcp/dhcpd.conf

Global parameters

option domain-name "example.org";
option domain-name-servers ns1.example.org, ns2.example.org;
default-lease-time 3600; 
max-lease-time 7200;
authoritative;

Define a subnet

subnet 192.168.10.0 netmask 255.255.255.0 {
        option routers                  192.168.10.1;
        option subnet-mask              255.255.255.0;
        option domain-search            "example.org";
        option domain-name-servers      192.168.10.1;
        range   192.168.10.10   192.168.10.100;
        range   192.168.10.110   192.168.10.200;
}

[Optional] Configure static IP

host centos-node {
     hardware ethernet 00:f0:m4:6y:89:0g;
     fixed-address 192.168.10.105;
}

host fedora-node {
     hardware ethernet 00:4g:8h:13:8h:3a;
     fixed-address 192.168.10.106;
}

3. Start DHCP serivce automatically

------------ SystemD ------------ 
$ sudo systemctl start isc-dhcp-server.service
$ sudo systemctl enable isc-dhcp-server.service


------------ SysVinit ------------ 
$ sudo service isc-dhcp-server start

4. Allow DHCP service on firewall

$ sudo ufw allow  67/udp
$ sudo ufw reload
$ sudo ufw status

References

1. How to Install a DHCP Server in Ubuntu and Debian