The IP helper (also called a DHCP Relay Agent, or Relay Agent) is a setting on the router that points to the PXE/WDS server.
Right now you will have on your routers a Relay Agent that points to your DHCP server (unless you have DHCP servers on all of your networks). That Relay Agent directs your clients to the proper DHCP server to obtain an IP address. You would add a second Relay Agent that directs your clients to your PXE/WDS server. You would then remove options 66 and 67 from your DHCP server. This way when a remote client attempts to PXE boot, the relay agent sends that to both your DHCP server (so it can obtain an IP address) as well as to the PXE/WDS server to process the PXE request. There is nothing special that has to be configured on the Relay Agent to make it work for UEFI and/or BIOs. You could think of it as you’re moving option 66 from your DHCP server to your router. That’s the basics of how it works. Mike From: listsad...@lists.myitforum.com [mailto:listsad...@lists.myitforum.com] On Behalf Of Merenda, Kenneth Sent: Friday, October 07, 2016 8:43 AM To: mssms@lists.myitforum.com Subject: [mssms] IP Helpers for PXE I have a large environment where the DHCP server and WDS server are not always on the same subnet as the clients. In this case, what IP helpers are needed for PXE of both UEFI and BIOS devices? Currently, we’re using option 66 pointing to the WDS server (SCCM DP), and 67 pointing to SMSBoot\x86\wdsnbp.com. It seems to me that 67 would cause a problem for UEFI, but I’m hesitant to change. Right now, PXE works for BIOS but not UEFI, and I don’t want to break BIOS support just to get UEFI working. SCCM is environment 2012 R2 SP1 CU1 on Server 2008 R2. Thanks, in advance. ----------------------------- Kenneth Merenda ********************************************************** Electronic Mail is not secure, may not be read every day, and should not be used for urgent or sensitive issues
