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[Vigor3900] How to use DHCP relay over the VPN tunnel?

Support Model : Vigor3900Vigor2960

Vigor3900/2960 can act as a DHCP Relay Agent, which can let LAN clients obtain IP addresses from the other DHCP server, probably in another LAN subnet, or even in a remote network over VPN tunnel. DHCP Relay over VPN tunnel makes the network not be limited by location, and allows network administrator in a global company to manage all the branch offices by the single DHCP server. We’ll demonstrate how to set up Vigor3900 to relay DHCP requests to the DHCP server on for example here.

(This article applies to Vigor3900 and Vigor2960. For other models, please refer to the article here.)




VPN Settings

1. Establish a VPN tunnel between local and remote network. The process of creating a VPN please refer to the VPN category which is under the Support >> FAQ / Application Note on our web site.

2. After the VPN established, go to VPN and Remote Access >> VPN profiles, then double click the profile.


3. Click Advanced tab.


4. Enable the Multicast via VPN in order to use DHCP relay, then click Apply to save the settings.




LAN Settings

1. After finished the VPN settings, go to LAN >> General Setup, select the LAN profile you’d like to set DHCP relay then click Edit.


2. Disable the DHCP Server of the LAN profile, and click Apply. Or you can disable the feature while you are creating the LAN profile.


3. Go to the DHCP Relay tab.


4. Select the LAN profile you'd like to set DHCP Relay then click Edit.


5. Enable the profile, select VPN as the DHCP Server Location, enter the IP address of the DHCP server as the DHCP Server IP, and click Apply to save the settings.


Now, the LAN client can get the IP address from the remote DHCP server through VPN tunnel. You can use "ipconfig /release" and "ipconfig /renew" in the command prompt to renew your IP address.

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