Use DHCP Options concerning WDS for PXE Boot

Hi Prateek Singhal ,

I use Windows DHCP servers and Windows WDS server.

Simply create a Relay (under Network -> DHCP) on the desired interface (in your case the one with 172.22.10.0) and add your IP of your WDS server and Windows DHCP servers in it.

But if you want to stay with SFOS you can try to use the "DHCP options":

Thomas_XG : he wrote that he don't want to use / cannot use a windows server for this.

Prateek Singhal : Use the DHCP options for this, a list of needed options can be found here: https://techdirectarchive.com/2020/05/26/wds-and-dhcp-deployment-scenarios-how-to-configure-dhcp-server-option-60-66-and-67-for-windows-deployment-services/

PhilippRusch : Thank you so much for sharing your inputs. Yes I want to use SFOS as the DHCP server due to certain reasons.

But the issue is I do not have Option 66 & 67 in the DHCP Options. I have these Boot options which don't work for PXE boot when I enter the details in Next-server and Boot file location.

Just select "custom" and enter 66 into "Code", same with 67

Sorry, that didn't work. When I added the IP Address of my WDS server in the value and saved.

I am getting below error.

Maybe these Links help:

https://support.sophos.com/support/s/article/KB-000035918?language=en_US

https://docs.sophos.com/nsg/sophos-firewall/19.0/Help/en-us/webhelp/onlinehelp/AdministratorHelp/Network/DHCP/NetworkDHCPBootOptions/index.html

PhilippRusch : Can you please suggest/confirm if DHCP Options need to be on the same VLAN/Subnet to work properly?

did you try to set this via CLI ?

Has this been resolved for you yet? If not, then you might take a look in this discussion:  PXE Boot DHCP Option 66 + 67 - Client falsely using the Firewall IP-Address as TFTP Server

Boot options 66 and 67 don't work properly on Sophos (doesn't give PXE Client "Next Server" information)