Re: [Etherboot-discuss] Fwd: DHCP Config on Win2008 Server

[Miller, S. <Sha...@yr...>]

I have a few hundred Dell Optiplex GX280s.  If I recall correctly, they have LAN-On-Motherboard NICs.  This suggests that the PXE ROM is actually a "file" (module) incorporated into the BIOS image.  So your gPXE ROM build target (gpxe/src/bin/VVVVDDDD.rom) for that NIC will have to be substituted into that BIOS image somehow.  PLEASE share if you have success with this; working gPXE into BIOS images is certainly subject matter we can all benefit from.  Thanks!  - Shao

________________________________________
From: Michael Bonny [mailto:mb...@gm...] 
Sent: Thursday, August 20, 2009 08:18
To: eth...@li...
Subject: [Etherboot-discuss] Fwd: DHCP Config on Win2008 Server

forgot to add everyone. 
---------- Forwarded message ----------
From: Michael Bonny <mb...@gm...>
Date: 2009/8/20
Subject: Re: [Etherboot-discuss] DHCP Config on Win2008 Server
To: "Miller, Shao" <Sha...@yr...>

Your instructions worked perfectly!
 
Here are the screenshots.
 
This is wiki worthy, thanks heaps for your help.
 
 
Now I am going to try and create a gPXE BIOS for my Dell GX280, as the fallback from floppy to CD-rom doesnt seem to work.
 
Thanks again for your great instructions.
 
Cheers,
M

2009/8/19 Miller, Shao <Sha...@yr...> 

Good day Michael,

In regards to your question for how to provide the gPXE encapsulated
keep-san option:

I believe that you can
- highlight "DHCP" in the DHCP MMC
- right-click "DHCP"
- choose "Set Predefined Options..."
- click the "Add..." button
- Name: gPXE_Encap
- Data type: Byte  Array: True (Checked)
- Code: 175
- Description: gPXE Encapsulated Options
- click the "OK" button
- click the "Edit Array" button
- make it an array of three bytes: 0x08 0x01 0x01
- click the "OK" button
- click the "OK" button
- highlight your scope options
- right-click your scope options
- choose "Configure Options..."
- scroll down to find option 175
- put a check in option 175's checkmark box
- click the "OK" button

What this should accomplish is a manual build of the gPXE encapsulated
options.  The three bytes specify:
- 0x08 the keep-san option code
- 0x01 the length of the option's value data is 1 byte
- 0x01 the option's value data is 1 (true)

Such is the general format for DHCP options.  Encapsulated options are
just DHCP options all over again inside a DHCP option.  So on the wire,
option 175 should appear as:
- 0xAF option 175
- 0x03 option's value data is three bytes
- 0x08, 0x01, 0x01 encapsulated keep-san option

I haven't tested this, but it sure looks good!

- Shao Miller