Wireless Access

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Occasional Contributor I
Posts: 5
Registered: ‎12-02-2013

Dhcp server issues 169 range IP

We have configured two aruba controllers as master and local with more than 70 Aps. DHCP servers are configured in controllers as bellow.

 

Master        VLAN -192.168.32.0                     Excluding  192.168.32.1 to192.168.32.128

Local           VLAN-192.168.32.0                     Excluding  192.168.32.129 to192.168.32.253

Lease time on both controllers                     1Day   1Hour  10min

Aruba OS version is 5.0.4.13

 

Sometimes users get IP s from 169.X.X.X range when disconnecting and connecting to that SSID. How i resolve/find that problem?

IS this because the longer lease time? What is the recommended lease time for DHCP server?

 

Nare

Super Contributor II
Posts: 429
Registered: ‎01-19-2011

Re: Dhcp server issues 169 range IP

The 169.xx address range is usually self assigned by the device when it fails to receive a DHCP address. The lease time can be anything that works in your situation - for regular corporate clients could be up to a month but for busy guest networks can be as low as five minutes.

Occasional Contributor I
Posts: 5
Registered: ‎12-02-2013

Re: Dhcp server issues 169 range IP

How i verify the reason for not issuing IP address for this device.(this is not continuous problem, but we have find the reason)

Super Contributor II
Posts: 429
Registered: ‎01-19-2011

Re: Dhcp server issues 169 range IP

You can setup debugging on the controller - "logging level debugging network subcat dhcp". the after the clients have failed run -

show log network all. Additionally the lease can be viewed on the controller using  - show ip dhcp binding.

Guru Elite
Posts: 20,821
Registered: ‎03-29-2007

Re: Dhcp server issues 169 range IP


Nare wrote:

How i verify the reason for not issuing IP address for this device.(this is not continuous problem, but we have find the reason)


Nare,

 

You could try using an external DHCP server to see if the problem goes away.  Using a split scope is tricky.  It is quite possible that you are running out of DHCP addresses, or your clients are not handling the duplicate addresses possibly.  Is that the only DHCP scope you are running on the controller(s)?



Colin Joseph
Aruba Customer Engineering

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Occasional Contributor I
Posts: 5
Registered: ‎12-02-2013

Re: Dhcp server issues 169 range IP

Thanks for your all replies. We found this is happen due to issues all ip addresses for wireless devices from DHCP server(There is no free leases). Hence we reduce our DHCP lease time. Now we are work fine.

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