DHCP Relay dropping GW

Question

Trying to move my DHCP scope back to a Windows server, using the relay option. 
 Clients get's the IP and DNS servers, but they don't get the default GW? Running the same direct from UTM works, and the same direct with a client on the same vlan as the Windows DHCP server works. 
 Any sugestions? 
 Thanks in advance, 
 Ren&eacute;

Aditya Patel · Answer

HI Ren&eacute;, 
 As you are facing issue with the DHCP with the appliance used as a DHCP relay. The device would not block such request , instead it would be forwarded to the server and when a reply is received it would simply reply to the machine that would initiate the request , Could you test it with your DHCP server by using a test machine in the Same LAN/Vlan of the DHCP server . 
 Configuration for DHCP Relay 
 The Network Services > DHCP > Relay tab allows you to configure a DHCP relay. The DHCP service is provided by a separate DHCP server and the UTM Appliance works as a relay. The DHCP relay can be used to forward DHCP requests and responses across network segments. You need to specify the DHCP server and a list of interfaces between which DHCP traffic shall be forwarded. 
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 To configure a DHCP relay, proceed as follows: 
 1. On the Relay tab, enable DHCP Relay. 
 You can either click the status icon or the Enable button. 
 The status icon turns amber and the DHCP Relay Configuration area becomes editable. 
 2. Select the DHCP server. 
 3. Select an interface. 
 DHCP requests arriving on these interfaces will be forwarded to the selected DHCP server. 
 4. Click Apply. 
 Your settings will be saved. 
 To cancel the configuration, click Abort Enable or the amber colored status icon. 
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 Taken from Article 115147 community.sophos.com/.../115147 
 If you got the proper results such as gateway information . Then you would need to Capture the packets as the initial set up on the DHCP server and the client end PC and message me both PCAPs and also mention the MAC address and the IP address to analyze the logs . So I would provide you a concrete resolution . 
 You may also log a Ticket for the same if you wish and also message the ticket ID. 
 Thanks and Regards 
 Aditya Patel | Network and Security Engineer.