DHCP Relay configuration example new: Difference between revisions

Revision as of 11:52, 31 July 2024

Main Page > General Information > Configuration Examples > Router control and monitoring > DHCP Relay configuration example new

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

firmware version .

Introduction

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

Prerequisites

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

Topology

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

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 Server Node Configuration

LAN Configuration

Open router’s WebUI → Network → LAN click on current available LAN interface configuration:

General Settings

Make the following changes:

Enter IPv4 address: 192.168.4.1

Lease Configuration

Open router’s WebUI → System → Mantenance → CLI

Enter this command to CLI:

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

Static Route Configuration

Open WebUI → Network → Routing → Static routes

Static IPv4 Routes

click and apply this to the route:

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

DHCP Relay Configuration

Relay WAN Confiuration

Open router’s WebUI → Network → WAN → WAN interfaces click current available WAN interface configuration:

General Settings

Make the following changes:

Select Protocol: Static
Enter IPv4 address: 192.168.4.194

Relay LAN Confiuration

Open router’s WebUI → Network → LAN click current available LAN interface configuration:

General Settings

Make the following changes:

Enter IPv4 address: 192.168.2.1

Firewall Rule Configuration

Open router’s WebUI → Network → Firewall → Traffic Rules click on Allow-DHCP-Renew rule:

Firewall - Traffic Rules - Allow-DHCP-Renew

Enter Destination Port: 67

DHCP Replay Configuration

Open router’s WebUI → Network → DHCP → Server Settings → IPv4 → DHCPv4 servers click current available server interface configuration:

DHCPv4: lan

Make the following changes:

Enable: on
Select DHCPv4 mode: Relay
Enter DHCP server address: 192.168.2.1

@@ Line 86: / Line 86: @@
 [[File:DHCP_RELAY_4.png|border|class=tlt-border|center]]
-=====DHCP Server Configuration=====
+=====Firewall Rule Configuration=====
+Open router’s '''WebUI → Network → Firewall → Traffic Rules''' click [[File:Pencil2.png]] on Allow-DHCP-Renew rule:
+======Firewall - Traffic Rules - Allow-DHCP-Renew======
+----
+# Enter Destination Port: '''67'''
+[[File:DHCP_RELAY_8.png|border|class=tlt-border|center]]
+=====DHCP Replay Configuration=====
 ----
 Open router’s '''WebUI → Network → DHCP → Server Settings → IPv4 → DHCPv4 servers''' click [[File:Pencil2.png]]current available server interface configuration: