Higher Education

Reply
This is an open group. Sign in and click the "Join Group" button to become a group member and start posting.
Highlighted
MVP
Posts: 4,272
Registered: ‎07-20-2011
DHCP Setup
[ Edited ]

We been looking at making some changes to our current DHCP / IP segments setup and would like to get some feedback on how most of you have your DHCP setup

 

I have a couple questions that might help us out go in the right direction

 

What type of server are you guys using ? Is it load balanced ? 50/50 or 100% ?

 

Are you guys using /22 , /23 ?

 

Lease time ?

 

How many wireless users ?

 

Using VLAN pooling hash or even ?

 

IPv6 ?

 

 

 

 

 

 

 

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
MVP
Posts: 500
Registered: ‎04-03-2007
Re: DHCP Setup
What type of server are you guys using ? Is it load balanced ? 50/50 or 100% ?

We are using Bluecat Adonis dhcp servers. Each of the 2 claim half the pool and regularly balance the available leases between them.

Are you guys using /22 , /23 ?

We use /23s in the majority of locations. I'd use /22s if we were using RFC1918 space.

How many wireless users ?

Roughly 42,000 concurrently; about 110K to 120K unique each week.

Using VLAN pooling hash or even ?

Hash.

IPv6 ?

Not yet, but wish were already. I'm very curious if others are today, and would specifically ask:
1.) dual stack or v6 only?
2.) what equipment are using for NAT64?
3.) what challenges have you encountered?
4.) what ArubaOS version?
==========
Ryan Holland, ACDX #1 ACMX #1
The Ohio State University
MVP
Posts: 4,272
Registered: ‎07-20-2011
Re: DHCP Setup

Thanks Ryan

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Frequent Contributor I
Posts: 98
Registered: ‎08-19-2008
Re: DHCP Setup

 

What type of server are you guys using ? Is it load balanced ? 50/50 or 100% ?

Cisco Registrar, 100%.  Upgrading to new version soon though, and hopefully we will be using what I think Cisco calls 

 "one-lease-per-client" by using Mac-address for client identifier.  On this current version for some reason we could not do it (I am not the DHCP admin), and we had a couple of mis-behaving users eating up a ton of IPs, depleting a particular subnet on the pool.  And since the vlan pooling algorithm happens before a client requests an IP, clients were still placed on this subnet with no IPs left.   The mis-behaving client was basically requesting IPs and declining them.  Both times Mac OS X machines.

 

Are you guys using /22 , /23 ?

/24 for public ip subnets, and /22 for private IP subnets.

 

Lease time ?

We played with this a lot, and decided on 30 minutes.

 

How many wireless users ?

7000 simultaneous, about 10-12 unique

 

Using VLAN pooling hash or even ?

 hash

 

IPv6 ?

Not yet..

 

Ryan, 42k concurrent users?  wow!

Marcelo Lew
Wireless Network Architect-Engineer
University of Denver
Contributor I
Posts: 37
Registered: ‎06-17-2011
Re: DHCP Setup

What type of server are you guys using ? Is it load balanced ? 50/50 or 100% ?

Load balanced.

 

Are you guys using /22 , /23 ?

3x/23, 8x/22 and 1x/21

 

Lease time ?

Somethimes changes. At top times 30 minutes. Other times 2 hours. By the way we are monitoring the usage. 

 

How many wireless users ?

At top 7K but usually 4k.

 

 

Using VLAN pooling hash or even ?

hash. 

 

IPv6 ?

 We are ready but not yet. We made all trials and decided not use yet (2 years ago).

New Contributor
Posts: 7
Registered: ‎02-02-2012
Re: DHCP Setup

What type of server are you guys using ? Is it load balanced ? 50/50 or 100% ?

We use Microsoft DHCP Server that comes with Windows 2008 R2.  We have 4 major campuses and use a separate DHCP server for each campus.  We do not load balance.

 

Are you guys using /22 , /23 ?

We actually use a DHCP Pool - 16 separate /24 subnets for each campus.

 

Lease time ?

We had to lower our lease time to 4 hours.  This seems to work well for our environment.

 

How many wireless users ?

Yesterday's count was 3900 simultaneous users.

 

Using VLAN pooling hash or even ?

Hash

 

IPv6 ?

IPv4 only.

 

Hope this helps!

MVP
Posts: 4,272
Registered: ‎07-20-2011
Re: DHCP Setup

Thank you guys 

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Search Airheads
Showing results for 
Search instead for 
Did you mean: