Passing option-209 to PXE client w/ ISC DHCPD 2.0pl5
Glenn Satchell
Glenn.Satchell at uniq.com.au
Mon Dec 10 17:08:45 UTC 2007
In version 3 you can set dhcp-parameter-request-list to a comma
separated list of option numbers. Don't know if this works in version
2, but it is in the dhcp-options man page.
option dhcp-parameter-request-list uint16;
This option, when sent by the client, specifies which
options the client wishes the server to return. Nor-
mally, in the ISC DHCP client, this is done using the
request statement. If this option is not specified by
the client, the DHCP server will normally return every
option that is valid in scope and that fits into the
reply. When this option is specified on the server, the
server returns the specified options. This can be used
to force a client to take options that it hasn't
requested, and it can also be used to tailor the response
of the DHCP server for clients that may need a more lim-
ited set of options than those the server would normally
return.
I hope this is useful...
regards,
-glenn
>Date: Mon, 10 Dec 2007 08:44:44 -0800
>From: "Craig Johnston" <agspoon at gmail.com>
>To: dhcp-users at isc.org
>Subject: Passing option-209 to PXE client w/ ISC DHCPD 2.0pl5
>
>Does anyone remember if there is a way to coerce the ISC DHCPD version
>2 (2.0pl5) to send options to a PXE client that does not explicitly
>request them. I can do this in version 3 of DHCPD via the
>vendor-option-space mechanism, but this is not available in version 2
>of the server (the version my network switch uses).
>
>I want to be able to specify the PXE filename via option 209 (plus
>option 208 to enable it). I know how to set the option (option
>option-209 "myfile";), but the server will not return these parameters
>to the PXE client as they are not specifically requested.
>
>Thanks,
>Craig
>
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