Cisco AP's with Option 43

[Randall C Grimshaw]

I will add that not all vendors satisfy the need for this option. Cisco provides model information, Aruba does not. IP phone vendors like Aastra 6731i we have observed do not provide any value at all even though they portend to use dhcp for the configuration of their management services. I have to anecdotally comment that the percentage of devices that bother to return any value at all is diminishing. To any vendors lurking on this list I will say that I am very disappointed.

Randy. 

-----Original Message-----
From: dhcp-users-bounces at lists.isc.org [mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Glenn Satchell
Sent: Monday, May 18, 2009 12:12 PM
To: dhcp-users at lists.isc.org
Subject: RE: Cisco AP's with Option 43

Hi Austin

Yes, The Vendor Encapsulated Options are always dhcp option 43. They
are encoded as a set of sub-options.

See man dhcp-options and scroll down to the section titled VENDOR
ENCAPSULATED OPTIONS. You can use the Vendor Option Space as a way to
simplify encoding sub options.

regards,
-glenn

>From: "Frank Bulk" <frnkblk at iname.com>
>To: <dhcp-users at lists.isc.org>
>
>If this is TLV, then the '04' is the length of the text -- 4 characters,
>namely 10.1.3.2.
>
>Frank
>
>-----Original Message-----
>From: dhcp-users-bounces at lists.isc.org
>[mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of MONTFORD, AUSTIN
>Sent: Monday, May 18, 2009 8:47 AM
>To: dhcp-users at lists.isc.org
>Subject: RE: Cisco AP's with Option 43
>
>Thanks Randy and Alan, that did it.
>
>For the F1:04:0A:01:03:02 string I was able to find how the code 241 is
>F1 in hex and the server adds the 04 and converts ip to hex so I
>understand that.  I still have one more question though.  Are the vendor
>encapsulated options always 43?
>
>Also I submitted a request on the cisco site for them to update the
>webpage for isc dhcp.  I imagine someone else has asked them to do this
>before, but it's worth a try.
>
>Thanks again,
>Austin
>
>
>Date: Fri, 15 May 2009 14:24:00 -0400
>From: Randall C Grimshaw <rgrimsha at syr.edu>
>Subject: RE: Cisco AP's with Option 43
>To: "dhcp-users at lists.isc.org" <dhcp-users at lists.isc.org>
>Message-ID:
>	
><D1ED659D5D76664389FB55EE3E3EE506204FC8C3 at suex07-mbx-01.ad.syr.edu>
>Content-Type: text/plain; charset="us-ascii"
>
>We do not make subnet distinctions as you are attempting, my config
>(sans actual address) is below. You might try placing the subclass in
>subnet definitions leaving the class outside.
>
>option space LWAPP;
>option LWAPP.controller code 241 = ip-address;
>class "LWAPP" {
>  match option vendor-class-identifier;
>}
>
>subclass "LWAPP" "Cisco AP c1130"
>{
>  vendor-option-space LWAPP;
>  option LWAPP.controller 10.20.30.40;
>}
>subclass "LWAPP" "Cisco AP c1200"
>{
>  vendor-option-space LWAPP;
>  option LWAPP.controller 10.20.30.40;
>}
>subclass "LWAPP" "Cisco AP c1240"
>{
>  vendor-option-space LWAPP;
>  option LWAPP.controller 10.20.30.40;
>}
>subclass "LWAPP" "Cisco AP c1241"
>{
>  vendor-option-space LWAPP;
>  option LWAPP.controller 10.20.30.40;
>}
>subclass "LWAPP" "Cisco AP c1140"
>{
>  vendor-option-space LWAPP;
>  option LWAPP.controller 10.20.30.40;
>}
>subclass "LWAPP" "ArubaAP"
>{
>  vendor-option-space LWAPP;
>  option LWAPP.controller 10.20.30.40;
>}
>
>Randy
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