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Occasional Contributor I
Posts: 9
Registered: ‎12-14-2012

Assigning DHCP Reservations with Enterprise DHCP Server on VLAN Pools

Good evening

 

  I was wondering if there was anyway to assign DHCP reservations on a VLAN pool? We have a VAP with multiple /24 subnets, is there anyway to assign create a DHCP reservation in the server and ensure the IP is picked up by the client? We can do DHCP reservations with one subnet easily, but once you had a second subnet and start creating a pool, it's hit or miss. Is our only hope to enlarge the subnet? 

 

Thanks

 

 

Guru Elite
Posts: 8,330
Registered: ‎09-08-2010

Re: Assigning DHCP Reservations with Enterprise DHCP Server on VLAN Pools

You would need to create the reservation in each subnet (which is not feasible). 


Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Occasional Contributor I
Posts: 9
Registered: ‎12-14-2012

Re: Assigning DHCP Reservations with Enterprise DHCP Server on VLAN Pools

Thank you Mr. Cappalli

 

It was the answer I was afraid of getting, alas I was holding out hope there could be a way! Oh well, time to supernet some networks away!

Guru Elite
Posts: 8,330
Registered: ‎09-08-2010

Re: Assigning DHCP Reservations with Enterprise DHCP Server on VLAN Pools

The only other way would be to do some logic in your RADIUS server to ensure that certain devices always get a specific VLAN.

 

Example:

 

If AD group = students, return Aruba-VLAN = 10

If AD group = staff, return Aruba-VLAN = 20 

 

etc


Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Aruba
Posts: 1,285
Registered: ‎08-29-2007

Re: Assigning DHCP Reservations with Enterprise DHCP Server on VLAN Pools

As far as i know, according to the hashing algorithm, the device will always be assisned the same vlan (please correct me if I'm wrong).

 

You can let your device connect to see what vlan they are given, then assign your reservation.

 

However, if later down the line you add or remove a vlan from the pool, the vlan given to that client may change.


If my post is helpful please give kudos, or mark as solved if it answers your post.

ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
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