[help] Setting up IP helpers for SCCM PXE UEFI boot

Hello!

Sorry if this is absolute beginner stuff. I don't understand much about networking, I'm just an SCCM admin, so not very familiar with all this.

I'd like to make it so computers using UEFI are able to network boot into PXE.

• Client computers that need to boot with PXE are on multiple subnets eg. 192.168.5.x, 192.168.111.x etc.

• DHCP and the SCCM/PXE server providing boot images is on 192.168.10.x

I googled a lot and found a few guides, but unfortunately I can't wrap my head around all of this.

1. https://www.youtube.com/watch?v=k5E97ndlRog

2. https://gal.vin/2017/05/05/pxe-booting-for-uefi-bios/

I did set up the DHCP vendor classes and scope policies like mentioned in the guides, but the clients still end up timing out.

I understand if the client and servers are in different subnets, something called an IP helper/dhcp replay needs to be set up?

So I guess the actual question is how a working setup should look like. What needs to be forwarded to what and where the IP helpers need to be set up in this scenario?

Thanks!