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msdhcp [2009/05/24 14:07]
rulerof
msdhcp [2010/03/15 16:41] (current)
sha0 Correct image file locations
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 {{:​reservation-options.png}} {{:​reservation-options.png}}
 +
 +==== Setting up a gPXE Encapsulated Options on Windows DHCP ====
 +
 +Unfortunately,​ this is fairly tricky and involves manually editing the array of bytes that will be sent to the gPXE client in DHCP option 175, which is where Etherboot/​gPXE encapsulated options go.
 +
 +Firstly, you need to create the encapsulated options. ​ Right-click on the server, then choose "Set Predefined Options..."​
 +
 +{{msdhcp:​win_dhcp_encap1.jpg}}
 +
 +Click the "​Add..."​ button.
 +
 +{{msdhcp:​win_dhcp_encap2.jpg}}
 +
 +Use the following options then click the "​OK"​ button:
 +
 +  Name: gPXE_Options
 +  Data type: Encapsulated
 +  Code: 175
 +  Description:​ gPXE_Options
 +
 +{{msdhcp:​win_dhcp_encap3.jpg}}
 +
 +Click the "Edit Array..."​ button:
 +
 +{{msdhcp:​win_dhcp_encap4.jpg}}
 +
 +This is where you can manually enter some defaults. ​ We'll use iSCSI username and password as an example. ​ We see from gpxe/​src/​include/​gpxe/​dhcp.h that the username option is 0xBE and the password option is 0xBF.  So add these along with an end-of-option code and click the "​OK"​ button:
 +
 +  0xBE 0xBF 0xFF
 +
 +{{msdhcp:​win_dhcp_encap5.jpg}}
 +
 +Back in the "​Predefined Options and Values"​ window, click the "​OK"​ button:
 +
 +{{msdhcp:​win_dhcp_encap6.jpg}}
 +
 +Now choose a client who you'd like to configure specific options for in the "​Reservations"​ area.  Right-click and choose "​Configure Options...":​
 +
 +{{msdhcp:​win_dhcp_encap7.jpg}}
 +
 +Find the gPXE_Options with code 175 that you defined:
 +
 +{{msdhcp:​win_dhcp_encap8.jpg}}
 +
 +Now you can manually add in a username and a password, following the respective options numbers:
 +
 +{{msdhcp:​win_dhcp_encap9.jpg}}
 +
 +Now you must insert the length for the username, and the length for the password. ​ In our example, "u s e r n a m e" and "p a s s w o r d" are both 8 characters long, so we use the hexadecimal value for 8.  The length field goes right after the option field. ​ Once entered, you may click the "​OK"​ button:
 +
 +{{msdhcp:​win_dhcp_encap10.jpg}}

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