Re: DHCP Config on Win2008 Server

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

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