How To Install DHCP Server In Linux

In this video, we show you how to install DHCP server in Linux using Ubuntu 20.04 LTS and ISC DHP server

We'll also set up a DHCP Relay Agent and firewall rules to service DHCP requests in a different submet

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Useful links:
https://https://ubuntu.com/download/server

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Configuration example:
1) Install Ubuntu and update the OS

2) Install the ISC ( Internet Systems Consortium) DHCP service
sudo apt install isc-dhcp-server

3) Bind DHCP to a specific interface
cd /etc/default
sudo cp isc-dhcp-server isc-dhcp-server.bak

Check the interface name
ip addr

Edit the config file
sudo nano isc-dhcp-server

INTERFACESv4="ens192"
INTERFACESv6="ens192"

4) Configure the DHCP service
cd /etc/dhcp
sudo cp dhcpd.conf dhcpd.conf.bak
sudo nano dhcpd.conf

# Global settings
option domain-name "templab.lan";
option domain-name-servers 172.16.17.10;

default-lease-time 600;
max-lease-time 7200;

# Disable DDNS
ddns-update-style none;

# Server is the authoritative DHCP server i.e. the only one
authoritative;

# Local subnet for network topology
subnet 172.16.17.0 netmask 255.255.255.0 {
}

# Pool to lease IP addresses from
subnet 172.16.19.0 netmask 255.255.255.0 {
range 172.16.19.100 172.16.19.250;
option routers 172.16.19.254
}

# Reserved IP address for a specific host
host PC2 {
hardware ethernet 00:0c:29:a9:d1:4c;
fixed-address 172.16.19.40;
}

5) Start and check DHP service
sudo systemctl start isc-dhcp-server
sudo systemctl status isc-dhcp-server

6) DHCP Relay Agent
Configure a DHCP Relay Agent on Layer 3 gateways to point to the DHCP server

7) Firewall Rules to allow DHCP traffic
Allow UDP traffic from the LAN subnet ,source port 68, to the DHCP server, destination port 67

8) Check leasing
dhcp-lease-list
NOTE: This does not show reserved IPs. Check the config file for that

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00:00 Intro
00:35 Planning
04:01 Install & Configure DHCP
22:50 Test DHCP
27:40 DHCP Relay Agent

Видео How To Install DHCP Server In Linux канала Tech Tutorials - David McKone