Dhcp option 43 aruba

Dhcp option 43 aruba DEFAULT

 

Appendix A

DHCP with Vendor-Specific Options

A standards-compliant DHCP server can be configured to return the host Arubacontroller’s IP address through the Vendor-Specific Option Code (option 43) in the DHCP reply. In the Arubauser-centric network, this information can allow an ArubaAP to automatically discover the IP address of a master controllerfor its configuration and management. This appendix describes how to configure vendor-specific option 43 on various DHCP servers.

This appendix contains the following topics:

Overview

DHCP servers are a popular way of configuring clients with basic networking information such as an IP address, a default gateway, network mask, DNS server, and so on. Most DHCP servers have the ability to also send a variety of optional information, including the Vendor-Specific Option Code, also called option 43.

Here is how option 43 works:

1.    The DHCP client on an ArubaAP adds an optional piece of information called the Vendor Class Identifier Code (option 60) to its DHCP request. The value of this code is ArubaAP.

2.    The DHCP server sees the Vendor Class Identifier Code in the request and checks to see if it has option 43 configured. If it does, it sends the Vendor-Specific Option Code (option 43) to the client. The value of this option is the loopback address of the Arubamaster controller.

3.    The AP receives a response from the DHCP server and checks if option 43 is returned. If it is, the AP contacts the master controller using the supplied IP address.

Windows-Based DHCP Server

Configuring a Microsoft Windows-based DHCP server to send option 43 to the DHCP client on an ArubaAP consists of the following two tasks:

  • Configuring Option 60

  • Configuring Option 43

Configuring Option 60

This section describes how to configure the Vendor Class Identifier Code (option 60) on a Microsoft Windows-based DHCP server.

As mentioned in the overview section, option 60 identifies and associates a DHCP client with a particular vendor. Any DHCP server configured to take action based on a client’s vendor ID should also have this option configured.

Since option 60 is not a predefined option on a Windows DHCP server, you must add it to the option list for the server.

To configure option 60 on the Windows DHCP server

1.    On the DHCP server, open the DHCP server administration tool by clicking
Start >Administrative Tools > DHCP.

2.    Find your server and right-click on the scope to be configured under the server name. Select Set Predefined Options.

3.    In the Predefined Options and Values dialog box, click the Add button.

4.    In the Option Type dialog box, enter the following information

Field

Information

Name

Aruba Access Point

Data Type

String

Code

60

Description

Aruba AP vendor class identifier

5.    Click OK to save this information.

6.    In the Predefined Options and Values dialog box, make sure 060 Aruba Access Pointis selected from the Option Name drop-down list.

7.    In the Value field, enter the following information:

String : ArubaAP

8.    Click OK to save this information.

9.    Under the server, select the scope you want to configure and expand it. Select Scope Optionsand expand it. Then select Configure Options.

10. In the Scope Options dialog box, scroll down and select 060 Aruba Access Point. Confirm the value is set to ArubaAPand click OK.

11. Confirm that the option 060 Aruba Access Point is listed in the right pane.

Configuring Option 43

Option 43 returns the IP address of the Arubamaster controllerto an ArubaDHCP client. This information allows ArubaAPs to auto-discover the master controller and obtain their configuration.

To configure option 43 on the Windows DHCP server:

1.    On the DHCP server, open the DHCP server administration tool by clicking Start > Administration Tools > DHCP.

2.    Find your server and right-click on the scope to be configured under the server name. Click on the Scope Options entry and select Configure Options.

3.    In the Scope Options dialog box (Figure 190), scroll down and select 043 Vendor Specific Info

Figure 190 Scope Options Dialog Box.

ScopeOptionsDialogBox.jpg

4.    In the Data Entry field, click anywhere in the area under the ASCII heading and enter the following information:

ASCII : Loopback address of the master controller

5.    Click the OK button to save the configuration.

Option 43 is configured for this DHCP scope. Note that even though you entered the IP address in ASCII text, it displays in binary form.

Figure 191 DHCP Scope Values

DHCPScopeValues.jpg

 

Linux DHCP Servers

The following is an example configuration for the Linux dhcpd.conf file.

After you enter the configuration, you must restart the DHCP service.

option serverip code 43 = ip-address;

class "vendor-class" {

      match option vendor-class-identifier;

}

.

.

.

subnet 10.200.10.0 netmask 255.255.255.0 {

   default-lease-time 200;

   max-lease-time 200;

   option subnet-mask 255.255.255.0;

   option routers 10.200.10.1;

   option domain-name-servers 10.4.0.12;

   option domain-name "vlan10.aa.mycorpnetworks.com";

   subclass "vendor-class" "ArubaAP" {

      option vendor-class-identifier "ArubaAP";

#

# option serverip <loopback-IP-address-of-master-controller>

#

      option serverip 10.200.10.10;

   }

   range 10.200.10.200 10.200.10.252;

}

 

Sours: https://www.arubanetworks.com/techdocs/ArubaOS_60/UserGuide/DHCP_Option_43.php

Here is a quick post for configuring DHCP option 43 and option 60 for Aruba Networks AP's on pfSense.

DHCP option 43 tells the AP the IP address of the master controller, hence when an AP first boots up he needs to connect to the master controller in order to get his first configuration (AP name, group, LMS/Backup LMS). There are several ways to instruct the AP who is the master controller, DHCP option 43 is one of them.

DHCP option 60 helps the server to identify the client specific vendor.

Log in into pfSense web GUI, go to Services / DHCP Server and the interface which serves the AP's.

Scroll down to Additional BOOTP/DHCP Options, and add the following options:

Note that option 43 should be expressed in HEX, but we convert ASCII text and not numbers!

So, in my example I need to convert the master controller IP: 10.100.110.200, we can use the following URL to ease the conversion: https://www.asciitohex.com/

In the end click save and let the AP boot up

Here is the pcap result:


Sours: https://www.madari.co.il/2018/08/pfsense-dhcp-option-43-for-aruba.html
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I wanted a slightly more independent DHCP server in my lab so I went looking for options. I ended up landing on CentOS 7 / Webmin / ISC DHCP rather than using my existing Windows Server setup (I wanted to be able to blow away that machine and not take down all addressing) or pfSense (can’t be a server and relay, and I need to send those packets to ClearPass).

New DHCP server means new learning opportunity, right? First opportunity: configuring option 43 to support an Aruba AP. Snippet from the dhcpd.conf is below.

subnet 192.168.200.0 netmask 255.255.255.0 { option domain-name "network.lab"; option routers 192.168.200.1; option ntp-servers 192.168.200.1; option domain-name-servers 192.168.200.10; # Aruba - Normal Campus AP subclass "vendor-class" "ArubaAP" { option vendor-class-identifier "ArubaAP"; option vendor-encapsulated-options "192.168.200.20"; } # Aruba - Unified AP subclass "vendor-class" "ArubaInstantAP" { option vendor-class-identifier "ArubaAP"; option vendor-encapsulated-options "192.168.200.20"; } range 192.168.200.41 192.168.200.254; }

Like this:

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Sours: https://wirelesswires.com/aruba-option-43-and-isc-dhcp/
DHCP Option 43, part 1

Aruba DHCP Option 60 (Vendor Class Identifier)

Almost all vendors implement the DHCP Option 60 RFC(2132) Vendor Class Identifier in their own way. The DHCP Option 60 is a string that the Access Point includes in the DHCP Discovery packet to the DHCP Server.

A DHCP server can be configured to filter on received option 60 string values and forward standard or vendor specific options (Option 43) in DHCP offer and acknowledgement packets.  Filtering using option 60 allows different types of devices that require vendor-specific information to co-exist in a common broadcast domain. (Having Cisco and Aruba AP in the same subnet, the DHCP Server should be configured with DHCP Option 43 and 60 for each Vendor).

If you do not specify an option 60 for some scope, the content of option 43 is returned to any DHCP client asking for an IP address in that subnet. In general we should try to define it in the DHCP scope as it makes sure that option 43 is returned only to APs and not other clients but it also depends upon the type of the DHCP server. For example Cisco IOS based DHCP scopes allow only one option 60 string (VCI) per scope , So you may not want to use it if you have different Vendor APs in the same subnet using IOS based DHCP.There is no such limitation on the Windows Server and hence the correct procedure is to define Option 60 for each Vendor.

The string value that is forwarded to the DHCP server is dependent on the Aruba Access Points mode.


 Aruba Access Points also requires specific option 60 values to be returned in DHCP offer and acknowledgement packets for vendor specific information to be considered. The expected option 60 value being dependent on the mode of the Access Points. If the expected option 60 value is not present in the DHCP offer or acknowledgement packet, any supplied vendor specific information is ignored. 

Vendor Specific Information (Option 43):

Aruba Access Points support vendor-specific information that can be provided in offer and acknowledgement packets. The type of vendor-specific information that is supported by an Aruba Access Point is dependent on the mode. For example Instant mode Access Points can be supplied with HTTP Proxy Server (Option 148) and/or (Option 43) AirWave Server information while Campus mode or Unified Access Points can be supplied Mobility Controller information. 

AirWave Server Discovery For IAP:

HTTP Proxy For IAP:

******Please note that both the username and password are forwarded to Instant mode Access Points in offers and acknowledgements in clear text. ******

The HTTP Proxy option can be used with Instant mode Access Points that are managed by AirWave or Central. When managed by AirWave, the HTTP Proxy option can be combined with the AirWave Server Discovery option. 

Controller Discovery For Campus/Unified AP:

Lets see the DHCP Scope Configuration for IAP and Campus/Unified APs.

Windows DHCP Server Config for Unified/Campus AP:

Windows DHCP Server Config for IAP AirWave:

Windows DHCP Server Config for IAP Http Proxy:

DHCP Server Config On Aruba OS Switch:

DHCP Server Config On Cisco Switch:

Happy Reading…..

Sours: http://the-ethernets.com/2020/10/aruba-dhcp-option-60/

Aruba dhcp option 43

 

Appendix A

DHCP with Vendor-Specific Options

Configuring Option 60

This section describes how to configure the Vendor Class Identifier Code (option 60) on a Microsoft Windows-based DHCP server.

As mentioned in the overview section, option 60 identifies and associates a DHCP client with a particular vendor. Any DHCP server configured to take action based on a client’s vendor ID should also have this option configured.

Since option 60 is not a predefined option on a Windows DHCP server, you must add it to the option list for the server.

To configure option 60 on the Windows DHCP server

1.    On the DHCP server, open the DHCP server administration tool by clicking 
Start > Administrative Tools > DHCP.

2.    Find your server and right-click on the scope to be configured under the server name. Select Set Predefined Options.

3.    In the Predefined Options and Values dialog box, click the Add button.

4.    In the Option Type dialog box, enter the following information

Field

Information

Name

Aruba Access Point

Data Type

String

Code

60

Description

Aruba AP vendor class identifier

5.    Click OK to save this information.

6.    In the Predefined Options and Values dialog box, make sure 060 Aruba Access Point is selected from the Option Name drop-down list.

7.    In the Value field, enter the following information:

String : ArubaAP

8.    Click OK to save this information.

9.    Under the server, select the scope you want to configure and expand it. Select Scope Options and expand it. Then select Configure Options.

10. In the Scope Options dialog box, scroll down and select 060 Aruba Access Point. Confirm the value is set to ArubaAP and click OK.

11. Confirm that the option 060 Aruba Access Point is listed in the right pane.

Configuring Option 43

Option 43 returns the IP address of the Aruba master controller to an Aruba DHCP client. This information allows Aruba APs to auto-discover the master controller and obtain their configuration.

To configure option 43 on the Windows DHCP server:

1.    On the DHCP server, open the DHCP server administration tool by clicking 
Start > Administration Tools > DHCP.

2.    Find your server and right-click on the scope to be configured under the server name. Click on the Scope Options entry and select Configure Options.

3.    In the Scope Options dialog box (Figure 197), scroll down and select 043 Vendor Specific Info

Figure 197  Scope Options Dialog Box.

ScopeOptionsDialogBox.jpg

4.    In the Data Entry field, click anywhere in the area under the ASCII heading and enter the following information:

ASCII : Loopback address of the master controller

5.    Click the OK button to save the configuration.

Option 43 is configured for this DHCP scope. Note that even though you entered the IP address in ASCII text, it displays in binary form.

Figure 198  DHCP Scope Values

DHCPScopeValues.jpg

 

DHCP Relay Agent Information Option (Option 82)

The DHCP Relay Agent Information option (Option 82) allows the DHCP Relay Agent to insert circuit specific information into a request that is being forwarded to a DHCP server.

The controller, when acting as a DHCP relay agent, inserts information about the AP and SSID through which a client is connecting into the DHCP request. Many service providers use this mechanism to make access control decisions.

Configuring Option 82

You can configure Option 82 using the WebUI or the CLI. You can include only the MAC address or MAC address and ESSID. The MAC address is the hardware address and ESSID is an alphanumeric name that uniquely identifies a wireless network.

In the WebUI

1.    Navigate to Configuration > Network > IP >IP Interfaces.

2.    Click Edit next to the VLAN ID for which you want to configure Option 82.

3.    Under DHCP Helper Address select Mac or Mac Essid from the Option-82 drop-down menu.

4.    Click Apply.

In the CLI

This example enables Option 82 for VLAN 5 using ESSID. You can include only the MAC address or MAC address and ESSID.

(host) (config) #interface vlan 5

(host) (config-subif)#option-82

(host) (config-subif)#option-82 mac essid

(host) (config-subif)#

Linux DHCP Servers

The following is an example configuration for the Linux dhcpd.conf file.  After you enter the configuration, you must restart the DHCP service.

option serverip code 43 = ip-address;

class "vendor-class" {

      match option vendor-class-identifier;

}

.

.

.

subnet 10.200.10.0 netmask 255.255.255.0 {

   default-lease-time 200;

   max-lease-time 200;

   option subnet-mask 255.255.255.0;

   option routers 10.200.10.1;

   option domain-name-servers 10.4.0.12;

   option domain-name "vlan10.aa.mycorpnetworks.com";

   subclass "vendor-class" "ArubaAP" {

      option vendor-class-identifier "ArubaAP";

#

# option serverip <loopback-IP-address-of-master-controller>

#

      option serverip 10.200.10.10;

   }

   range 10.200.10.200 10.200.10.252;

}

 

This appendix describes how to configure several DHCP vendor-specific options. Topics include?

Windows-Based DHCP Server

Configuring a Microsoft Windows-based DHCP server to send option 43 to the DHCP client on an Aruba AP consists of the following two tasks:

  • Configuring Option 60

  • Configuring Option 43

DHCP servers are a popular way of configuring clients with basic networking information such as an IP address, a default gateway, network mask, DNS server, and so on. Most DHCP servers have the ability to also send a variety of optional information, including the Vendor-Specific Option Code, also called option 43.

When a client or an AP requests for  option 43 (Vendor Specific Information), the controller responds with the value configured by administrator in the DHCP pool.

Note:this release has not been updated since the release of the pdf

Sours: https://www.arubanetworks.com/techdocs/ArubaOS_61/ArubaOS_61_UG/DHCP_Option_43.php
Aruba Controller DHCP Settings

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