[syslinux] Can PXElinux be used to dynamically pass DHCP option 252 to a PXE client?

[Martijn Olivier Tigchelaar]

Yes - I did come across that option after I posted my message. And it works fine when I type in the commands manually.

 

Here is what I do whilst i'm still testing and trying to figure out how to automate this:

 

- I boot into pxelinux and start vesamenu.c32

- In the menu, I have an option to start gpxelinux.0

- I select the gPXE menu entry to start gpxelinu.0

- I press Ctrl-B to get to the prompt

- I type in:

-- dhcp net0 (this gets me a new ip...)

-- set net0/252:string Path\to\BCD\file\for\Microsoft\bootmgr.exe

-- kernel pxeboot.0 (this file was renamed from "pxeboot..n12")

-- boot

 

The above then loads "pxeboot.0" with my tailored DHCP option 252 pointig to a valid BCD file. "pxeboot.0" gets me to "bootmgr.exe" and "bootmgr.exe" loads the BCD file that the DHCP option 252 points to.

 

Now - how do I do all of this WITHOUT having to type these commands in manually?

 

Ideally, I want to have a menu system where the different options listed depend on a different string to be passed in the DHCP option 252 field. For example:

- Menu option "Windows PE 3" may need DHCP option 252 set to "winpe3.bcd"

- Menu option "Windows 7 BM deploy" may need DHCP option 252 set to "win7bm.bcd"

- and so on.

 

Martijn

 

 
> Not strictly an answer to your question, but if you're using gpxelinux.0 then 
> you could issue something equivalent to "set net0/252.string 
> \path\to\BCD\file", which would cause the gPXE part to include option 252 
> within the (always artificially constructed) DHCP reply. That should work, 
> though there may be an easier way to do it.
> 
> Michael
 		 	   		  
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