Hi All,

We have only 1 IP-helper. We point it to the broadcast address of the segment of our DHCP and PXE server.

So IP-helper is configured to In I have all our DHCP servers and a PXE server. This PXE Server (W2K12R2 with WDS) provides a menu using PXELINUX http://www.syslinux.org/wiki/index.php?title=PXELINUX from where enduser can choose what to PXE Chain into.


On 07-10-2016 14:58, Marable, Mike wrote:
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

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.


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



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