What Is The Name Of The Daemon (Service) Of The Dhcp Server

Dynamic Host Configuration Protocol (DHCP) is a network protocol that is used to enable host computers to exist automatically assigned IP addresses and related network configurations from a server.

The IP address assigned by a DHCP server to DHCP client is on a "lease", the lease fourth dimension unremarkably varies depending on how long a customer estimator is likely to crave the connectedness or DHCP configuration.

How Does DHCP Work?

The post-obit is a quick description of how DHCP actually works:

Once a client (that is configured to use DHCP) and connected to a network boots up, it sends a DHCPDISCOVER packet to the DHCP server.
When the DHCP server receives the DHCPDISCOVER request parcel, it replies with a DHCPOFFER packet.
Then the customer gets the DHCPOFFER bundle, and it sends a DHCPREQUEST packet to the server showing information technology is set up to receive the network configuration information provided in the DHCPOFFER packet.
Finally, after the DHCP server receives the DHCPREQUEST parcel from the customer, it sends the DHCPACK packet showing that the client is now permitted to use the IP address assigned to information technology.

In this article, we will testify you lot how to setup a DHCP server in Ubuntu/Debian Linux, and we will run all the commands with the sudo command to gain root user privileges.

Testing Environment Setup

We are going to utilise following testing environment for this setup.

          DHCP Server          - Ubuntu 16.04          DHCP Clients          - CentOS 7 and Fedora 25

Step 1: Installing DHCP Server in Ubuntu

1. Run the command below to install the DCHP server parcel, which was formerly known every bit dhcp3-server.

$ sudo apt install isc-dhcp-server

2. When the installation completes, edit the file /etc/default/isc-dhcp-server to define the interfaces DHCPD should utilize to serve DHCP requests, with the INTERFACES option.

For example, if you want the DHCPD daemon to listen on eth0, set it like then:

INTERFACES="eth0"

And likewise learn how to configure a static IP address for the interface higher up.

Step 2: Configuring DHCP Server in Ubuntu

3. The main DHCP configuration file is /etc/dhcp/dhcpd.conf, you must add together all your network information to be sent to clients here.

And, there are two types of statements defined in the DHCP configuration file, these are:

parameters – specify how to perform a task, whether to carry out a task, or what network configuration options to send to the DHCP client.
declarations – define the network topology, country the clients, offer addresses for the clients, or apply a group of parameters to a group of declarations.

4. Now, open and modify the main configuration file, define your DHCP server options:

$ sudo vi /etc/dhcp/dhcpd.conf

Set up the post-obit global parameters at the superlative of the file, they will utilise to all the declarations below (do specify values that apply to your scenario):

option domain-name "tecmint.lan"; option domain-name-servers          ns1.tecmint.lan,          ns2.tecmint.lan; default-lease-fourth dimension 3600;  max-lease-fourth dimension 7200; authoritative;

5. Now, ascertain a subnetwork; hither, we'll setup DHCP for 192.168.ten.0/24 LAN network (use parameters that apply to your scenario).

subnet 192.168.10.0 netmask 255.255.255.0 {         option routers                  192.168.10.1;         choice subnet-mask              255.255.255.0;         option domain-search            "tecmint.lan";         pick domain-name-servers      192.168.x.i;         range   192.168.10.10   192.168.10.100;         range   192.168.ten.110   192.168.ten.200; }

Step iii: Configure Static IP on DHCP Client Machine

half-dozen. To assign a fixed (static) IP address to a particular client computer, add the section below where you demand to explicitly specify it'due south MAC addresses and the IP to exist statically assigned:

host centos-node { 	 hardware ethernet 00:f0:m4:6y:89:0g; 	 stock-still-address 192.168.10.105;  }  host fedora-node { 	 hardware ethernet 00:4g:8h:13:8h:3a; 	 stock-still-accost 192.168.10.106;  }

Save the file and close it.

seven. Next, get-go the DHCP service for the time being, and enable it to start automatically from the adjacent system boot, similar so:

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

8. Next, exercise not forget to permit DHCP service (DHCPD daemon listens on port 67/UDP) on firewall as below:

$ sudo ufw permit  67/udp $ sudo ufw reload $ sudo ufw prove

Step 4: Configuring DHCP Client Machines

ix. At this point, you tin can configure your clients computers on the network to automatically receive IP addresses from the DHCP server.

Login to the client computers and edit the Ethernet interface configuration file as follows (accept note of the interface name/number):

$ sudo vi /etc/network/interfaces

And define the options below:

car  eth0 iface eth0 inet dhcp

Save the file and exit. And restart network services similar so (or reboot the system):

          ------------ SystemD ------------          $ sudo systemctl restart networking          ------------ SysVinit ------------          $ sudo service networking restart

Alternatively, employ the GUI on a desktop machine to perform the settings, set the Method to Automatic (DHCP) as shown in the screenshot beneath (Fedora 25 desktop).

Set DHCP Network in Fedora — Fix DHCP Network in Fedora

At this point, if all settings are correctly configured, your client machine should be receiving IP addresses automatically from the DHCP server.

That's information technology! In this tutorial, we showed you how to setup a DHCP server in Ubuntu/Debian. Share your thoughts with us via the feedback section beneath. If you are using Fedora based distribution, become through how to setup a DHCP server in CentOS/RHEL.

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