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Contributor I

Detailed exact dhcp option configuration for AP master discovery

Hello

 

what is the right dhcp configuration for AP master discovery?

 

thanks 

 

Steffen

Guru Elite

Re: Detailed exact dhcp option configuration for AP master discovery

DHCP Option 43 = <controller-ip>

DHCP Option 60 = ArubaAP


| Tim Cappalli | Aruba Security | @timcappalli | timcappalli.me |

NOTE: Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba or Hewlett Packard Enterprise.
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Aruba

Re: Detailed exact dhcp option configuration for AP master discovery

You ask for "detailed", but don't say what DHCP server.  

 

In general, the following should be configured:

  • DHCP Option 43 =  <IP of Controller>
  • DHCP Option 60 = ArubaAP

Details fo different DHCP Servers:

 

------------------------------------------------
Systems Engineer, Northeast USA
AMFX | ACCX | ACDX | ACMX

Contributor I

Re: Detailed exact dhcp option configuration for AP master discovery

Thanks for the fast reply.

 

as i understand is the following correct?:

 

- the DHCP server receives the AP's DHCP request

- in this request is an Option 60 with value ArubaAP

- with this, the DHCP Server can filter this request and send a defined Option 43, which is configured in this filter

is this all, or must the DHCP Server sends the Option 60 back to the Access Point?

And when yes, is the question for what i must do this?

 

Thanks

 

Steffen

 

Re: Detailed exact dhcp option configuration for AP master discovery

Hi Steffen, As clembo said, what's the DHCP Server? Is it Adonis Blue Cat, Windows Server, etc?


#AirheadsMobile

Re: Detailed exact dhcp option configuration for AP master discovery


@Steffen wrote:

Thanks for the fast reply.

 

as i understand is the following correct?:

 

- the DHCP server receives the AP's DHCP request

- in this request is an Option 60 with value ArubaAP

- with this, the DHCP Server can filter this request and send a defined Option 43, which is configured in this filter

is this all, or must the DHCP Server sends the Option 60 back to the Access Point?

And when yes, is the question for what i must do this?

 

Thanks

 

Steffen

 


Hi Steffen,

 

Just trying to save you some time and frustration from our own personal experience - hence the importance of clembo's question about the DHCP Server Type/Vendor. We had spent several days of research (looking into 3 year old posts - Adonis BlueCat DHCP Option 43 for Aruba AP's) and working with Aruba TAC to figure out DHCP Option 43. We were able to get DHCP Option 43 working after reaching out to BlueCat Support - who actually had pre-made instructions for us. :-) - which also led to marking the earlier mentioned 3 year old post as solved.

 

I believe your understanding of the steps for DHCP Option 43 is correct. In regards to Option 60 being sent back to the AP - I suspect this is necessary as packet captures of our "Successful Implementation" of Option 43, as well as Aruba's KB Article Packet Capture show Option 43 AND Option 60 both being included in the DHCP Offer to the AP.

New Contributor

Re: Detailed exact dhcp option configuration for AP master discovery

do you have specific instructions for Mikrotik?

We are using Mikrotik RouterOS v6.40.5 for DHCP Server

 

In Mikrotik there are options I'm not sure what Aruba nrequires..

 

The Mikrotik Wiki supplies the following information regarding DHCP value types :

  • 0xXXXX - hex string (works also in v5)
  • 'XXXXX' - string (works also in v5 but without ' ' around the text)
  • $(XXXXX) - variable (currently there are no variables for server)
  • '10.10.10.10' - IP address
  • s'10.10.10.10' - IP address converted to string
  • '10' - decimal number
  • s'10' - decimal number converted to string

Thanks!

Re: Detailed exact dhcp option configuration for AP master discovery


@mclarkvawrote:

do you have specific instructions for Mikrotik?

We are using Mikrotik RouterOS v6.40.5 for DHCP Server

 

In Mikrotik there are options I'm not sure what Aruba nrequires..

 

The Mikrotik Wiki supplies the following information regarding DHCP value types :

  • 0xXXXX - hex string (works also in v5)
  • 'XXXXX' - string (works also in v5 but without ' ' around the text)
  • $(XXXXX) - variable (currently there are no variables for server)
  • '10.10.10.10' - IP address
  • s'10.10.10.10' - IP address converted to string
  • '10' - decimal number
  • s'10' - decimal number converted to string

Thanks!


I haven't seen instructions specific to Mikrotek. A packet capture of the DHCP offer would be helpful to confirm, but I would suspect the IP address response to be fine. Also, DHCP option 60 needs to be in the offer as well.


Charlie Clemmer
Aruba Customer Engineering
New Contributor

Re: Detailed exact dhcp option configuration for AP master discovery

Which is the right syntax on Linux server from below options. Please confirm.

 

option arubaap.serverip = "100.98.193.6";

or

option arubaap.serverip 146.250.59.20 ;  >>> can we have a space after IP? Is there an issue if we leave a space?

or 

option arubaap.serverip 100.100.224.134;

MVP Guru

Re: Detailed exact dhcp option configuration for AP master discovery

It looks like no space is required:

 

 option serverip 10.200.10.10;

https://www.arubanetworks.com/techdocs/ArubaOS_64_Web_Help/Web_Help_Index.htm#ArubaFrameStyles/DHCP_Option_43/Linux_DHCP_Servers.htm%3FTocPath%3DDHCP%20with%20Vendor-Specific%20Options%7C_____3


ACMP, ACSA, ACDX #985
If my post addresses your query, give kudos:)
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