DHCP Relay over VPN

Vigor router can act as a DHCP Relay Agent once the DHCP Server is not on the local LAN( e.g. remote VPN network, WAN site). Therefore, router will forward the DHCP requests to the DHCP server. To be a DHCP Relay Agent when the DHCP Server is located on the VPN network site. Following steps will be necessary.

a screenshot of DrayOS VPN profile

1. Go VPN and Remote Access >> LAN-to-LAN, Enable Multicast via VPN in the VPN profile connecting to the DHCP server.

a screenshot of DrayOS VPN profile

2. Go to LAN >> General Setup, select "Enable Relay Agent" at DHCP Server Configuration, and enter the local IP address of the DHCP server at DHCP Server IP Address.

a screenshot of DrayOS LAN General setup

With the configuration above, the router will forward the DHCP requests over the VPN.DHCP Relay over VPN.

Vigor router can act as a DHCP Relay Agent once the DHCP Server is not on the local LAN( e.g. remote VPN network, WAN site). Therefore, router will forward the DHCP requests to the DHCP server. To be a DHCP Relay Agent when the DHCP Server is located on the VPN network site. Following steps will be necessary.

a screenshot of DrayOS VPN profile

1 Go to VPN and Remote Access >> VPN Profiles, select the VPN profile connecting to the DHCP server. Select "Enable" for Multicast via VPN in the Advanced page.

a screenshot of vigor3900 VPN profile advanced tab

2. Go to LAN >> General Setup, select the LAN profile that should get IP addresses from the remote server then click Edit. Select "Disable" for DHCP Server and Apply.

a screenshot of vigor3900 LAN General Setup

3. Go to the DHCP Relay page, select the LAN profile then click Edit.

  • Check Enable
  • Select "VPN" for DHCP Server Location
  • Enter the IP address of the DHCP server at DHCP Server IP
  • Apply the settings.
a screenshot of Vigor3900 DHCP Relay page

With the configuration above, the router will forward the DHCP requests over the VPN.DHCP Relay over VPN.

Published On: Sep 05, 2017 

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