Setup a LAN without a Router (DHCP howto)

Setup a LAN without a Router

This knowledge is useful when setting up a LAN (local area network) for our own TCP/IP robot network across a network switch. To ensure that everything connected to the network can communicate with each other we will setup a DHCP server on one device connected to the switch to manage the network.

What is a DHCP?

See the DHCP Wikipedia Page.

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[LINUX] Setup a DHCP Server using the isc-dhcp-server package

Source instructions derived from here.. https://www.linuxfordevices.com/tutorials/ubuntu/dhcp-server-on-ubuntu

-- Install Package --

$ sudo apt install isc-dhcp-server

-- Setup --

... Configure the DHCP Server

$ sudo nano /etc/dhcp/dhcpd.conf

option domain-name "robot_network.lab";
option domain-name-servers 192.168.1.2;

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


ddns-update-style none;
authoritative;

subnet 192.168.1.0 netmask 255.255.255.0 {
  range 192.168.1.10 192.168.1.199;
  option routers 192.168.1.2;
}

... Point DHCP Server to a specific hardware interface

$ sudo nano /etc/default/isc-dhcp-server

INTERFACESv4="etho0"
INTERFACESv6=""

... Start DHCP server

$ sudo systemctl restart isc-dhcp-server.service