A DHCP relay agent allows the DHCP clients to obtain IP addresses from a DHCP server that is not configured on the same LAN.
This article provides a configuration example with details on how to set-up a DHCP relay over a L2TPv3 VPN.
Prerequisites
You will need:
Two RUT or RUTX devices (one as Server and other as Client)
A PC acting as a Host for testing
Both routers must have a Public Static or Public Dynamic IP addresses
Configuration Scheme
I will paste a Topology Image here
DHCP Server Settings
DHCP Pool
Enter the router's WebUI, go to Network > Interfaces > Ethernet LAN and click the 'Edit' button on the right side of the interface to set the LAN network address.
LAN network for DHCP server
Under DHCP SERVER set parameters for the DHCP pool.
DHCP pool parameters
Set up Mobile WAN as Main WAN
Enter to the router’s WebUI, go to Network > Interfaces press mouse click on the Mobile Wan interface, then drag it to the 1st position and then press Save & Apply.
