DHCPd - option capwap (code 138)

Discussion:

Radek

2021-05-06 08:48:55 UTC

Hello,
I want to use dhcpd server to push Wireless Controller's IP address to the APs.

According to this:
http://systemnetworksecurity.blogspot.com/2013/02/adding-custom-options-in-isc-dhcpds.html
https://www.secuvera.de/blog/capwap-dhcp-option-138-auf-isc-dhcpd-server-einrichten/
I need to add *option capwap* to /etc/dhcpd.conf

option capwap code 138 = ip-address; #Custom Option capwap
option capwap 192.168.1.110; #WLAN-Controller-IP

I can't find the capwap option in dhcp-options(5) i OpenBSD.
How can I do what I need using other options/configuration?
Thanks!

--
Radek

Denis Fondras

2021-05-06 09:45:43 UTC

Permalink

Post by Radek
Hello,
I want to use dhcpd server to push Wireless Controller's IP address to the APs.
http://systemnetworksecurity.blogspot.com/2013/02/adding-custom-options-in-isc-dhcpds.html
https://www.secuvera.de/blog/capwap-dhcp-option-138-auf-isc-dhcpd-server-einrichten/
I need to add *option capwap* to /etc/dhcpd.conf
option capwap code 138 = ip-address; #Custom Option capwap
option capwap 192.168.1.110; #WLAN-Controller-IP

Have you tried something like :

option option-138 C0:A8:01:6E;

?

Radek

2021-05-10 13:30:01 UTC

Permalink

Thank you Denis,Stu,

I added option-138, the syntax is correct now but the AP doesn't connect to the Controller.
Did I missed any other option(s) in my dhcpd.conf or should I look for the reason at the Controller side?

subnet 10.109.3.0 netmask 255.255.255.0 {
option routers 10.109.3.254;
range 10.109.3.201 10.109.3.220;
#option option-138 10.109.3.100;
option option-138 A:6D:3:64;

host [...]

On Thu, 6 May 2021 11:45:43 +0200

Post by Denis Fondras

option option-138 C0:A8:01:6E;
?

--
Radek

Radek

2021-05-11 11:57:42 UTC

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Update.
My conf seems to work as expected, but it took a few hours for APs to find the controller. Since then even new APs find the controlles in a few minutes.
Controller: Alcatel-Lucent OmniVista 2500
APs: OAW-AP1321-RW

Thanks for your help!

On Mon, 10 May 2021 15:30:01 +0200

Post by Radek
Thank you Denis,Stu,
I added option-138, the syntax is correct now but the AP doesn't connect to the Controller.
Did I missed any other option(s) in my dhcpd.conf or should I look for the reason at the Controller side?
subnet 10.109.3.0 netmask 255.255.255.0 {
option routers 10.109.3.254;
range 10.109.3.201 10.109.3.220;
#option option-138 10.109.3.100;
option option-138 A:6D:3:64;
host [...]
On Thu, 6 May 2021 11:45:43 +0200

Post by Denis Fondras

option option-138 C0:A8:01:6E;
?

--
Radek

Stuart Henderson

2021-05-07 08:44:19 UTC

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