Option 43 for Cisco LWAP

Randall C Grimshaw rgrimsha at syr.edu
Mon Oct 20 19:25:50 UTC 2008


 

Are you sure it is option 43 you want?  We use option 241 as shown
below...

 

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 10.121.10.119;

}

subclass "LWAPP" "Cisco AP c1200"

{

  vendor-option-space LWAPP;

  option LWAPP.controller 10.121.10.119;

}

subclass "LWAPP" "Cisco AP c1240"

{

  vendor-option-space LWAPP;

  option LWAPP.controller 10.121.10.119;

}

subclass "LWAPP" "Cisco AP c1241"

{

  vendor-option-space LWAPP;

  option LWAPP.controller 10.121.10.119;

}

 

Randy

________________________________

From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On
Behalf Of Brendan Forsyth
Sent: Monday, October 20, 2008 2:57 PM
To: dhcp-users at isc.org
Subject: Option 43 for Cisco LWAP

 

Here is my problem.  When I use the Cisco DHCP server and add option 43
for telling the access points about where the WiSM controller is,
everything works fine.  However from DHCP ISC v3.0.5, it doesn't.  Here
are the two configs:

 

Cisco:

ip dhcp pool auto-pool
   network 172.17.112.0 255.255.255.0
   domain-name pvh.org
   option 43 hex f104.ac11.fe29
   option 60 ascii "Cisco AP c1200"
   default-router 172.17.112.1 

A wire shark dump of the ACK shows this:

Option: (t=43, l=6) Vendor-Specific Information

   Option:  (43) Vendor-Specific Information

   Length:  6

   Value: F104AC11FE29

 

The packet dump shows 2b 06 f1 04 ac 11 fe 29

 

ISC DHCP

 

option space Cisco_LWAPP_AP;
option Cisco_LWAPP_AP.server-address code 43 = string;

        class "Cisco AP c1200" {
                match if option vendor-class-identifier = "Cisco AP
c1200";
                option dhcp-parameter-request-list 43;
                option vendor-class-identifier "Cisco AP c1200";
                vendor-option-space Cisco_LWAPP_AP;
                option Cisco_LWAPP_AP.server-address f1:04:ac:11:fe:29;
        }

Option: (t=43, l=8) Vendor-Specific Information

   Option:  (43) Vendor-Specific Information

   Length:  8

   Value: F104AC11FE29

 

The packet dump shows 2b 08 2b 06 f1 04 ac 11 fe 29

 

Note the two extra octets in the DHCP dump.  Also the class definition
was obtained from Cisco's site about configuring ISC DHCP for option 43
functionality.

 

Any advice is appreciated.

 

Thanks,

 

 

 

Brendan Forsyth
Senior System Administrator

Poudre Valley Health Care
3702 Automation Way
Fort Collins CO 80525
bff at pvhs.org
(970) 495-7731 office

 

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