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Configure IP helper for DHCP server behind the X0 (LAN) interface
07/22/2022 
406 People found this article helpful
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Description
The IP Helper allows the SonicWall to forward DHCP requests originating from the interfaces on a SonicWall to a centralized DHCP server on the behalf of the requesting client. IP helper is used extensively in routed VLAN environments where a DHCP server is not available for each interface, or where the layer three routing mechanism is not capable of acting as a DHCP server itself. The IP helper also allows NetBIOS broadcasts to be forwarded with DHCP client requests.
Resolution
This release includes significant user interface changes and many new features that are different from the SonicOS 6.5 and earlier firmware. The below resolution is for customers using SonicOS 7.X firmware. The IP Helper allows the SonicWALL to forward DHCP requests originating from the interfaces on a SonicWALL to a centralized DHCP server on the behalf of the requesting client. IP Helper is used extensively in routed VLAN environments where a DHCP server is not available for each interface, or where the layer three routing mechanism is not capable of acting as a DHCP server itself. The IP Helper also allows NetBIOS broadcasts to be forwarded with DHCP client requests. 1. Navigate to the Network | IP Helper 5. Protocol: Select DHCP or NetBIOS from the protocol menu This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware. In the SonicWall interface under Network |IP Helper: 2. Relay Protocols - check Enable for the DHCP protocol. 3. Policies - click add. Resolution for SonicOS 7.X
2. Check Enable IP Helper button
3. Enable DHCP from the protocol menu
4. Navigate to Policies, click on the add button
6. From: Select a source Interface or Zone from the From menu.
7. To: Select a destination IP address or subnet from the To menu.
8. Click OK to add the policy to the IP Helper policies table and Accept
Resolution for SonicOS 6.5
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