DHCP Relay configuration example new

The information on this page is updated in accordance with the 00.07.08 firmware version .

firmware version .

Introduction

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DHCP Relay is a router that forwards IP addresses from the DHCP Server to the user devices, even if the server is on a different network. The main benefit of this approach is that a single DHCP Server can distribute IP addresses to multiple networks. Bellow you will find an example of how to configure a basic DHCP Relay configuration. ​

Prerequisites & Topology

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Prerequisites

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1. For this configuration you will need 2 routers. One as a DHCP Server and the other as a DHCP Relay.
2. DHCP Relay device WAN port needs to be connected to DHCP server LAN port.

Topology

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DHCP Relay network settings:

LAN IP/subnet: 192.168.2.1/24
WAN IP: 192.168.4.194

DHCP server network settings:

LAN IP/subnet: 192.168.4.1/24

Configuration

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If you're having trouble finding this page or some of the parameters described here on your device's WebUI, you should turn on "Advanced WebUI" mode. You can do that by clicking the "Advanced" button, located at the top of the WebUI.

DHCP Relay Server Configuration

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Configure Relay Server LAN

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This router requires internet access. The specified settings should be activated by default. Open router’s WebUI → Network → LAN click on current available LAN interface configuration:

General Settings

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Make the following changes:

1. Enter IPv4 address: 192.168.4.1

Configure Relay Client DHCP lease

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Open router’s WebUI → System → Mantenance → CLI

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Enter this command to CLI:

echo "dhcp-range=192.168.2.100,192.168.2.200,12h" >> /etc/dnsmasq.conf

Configure Route For DHCP Packets To Reach Relay Client

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Open WebUI → Network → Routing → Static routes

Static IPv4 Route

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click and apply this to the route:

1. Select Interface: lan | Enter Target: 192.168.2.0 | Enter IPv4-Netmask: 255.255.255.0 | Enter IPv4-Gateway: 192.168.4.194