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5
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Amanulla Khan
Beginner

Not able to get DHCP IP via 2504 WLAN Controller

Hi,

I have a Cisco Wlan Controller 2504 with 1042N AP (3-nos) every thing was working fine from past 2 months. Now i am getting a issue with clients which are connected to the wireless AP, they are not able to get an dhcp IP address from the 2960 Switch (DHCP Server). The clients are getting IP address as 0.0.0.0.

This is My Configuration:

System Information

Manufacturer's Name.............................. Cisco Systems Inc.

Product Name..................................... Cisco Controller

Product Version.................................. 7.0.220.0

Bootloader Version............................... 1.0.16

Field Recovery Image Version..................... 1.0.0

Firmware Version................................. PIC 16.0

Build Type....................................... DATA + WPS

System Name...................................... WLAN

System Location..................................

System Contact...................................

System ObjectID.................................. 1.3.6.1.4.1.9.1.1279

IP Address....................................... 192.168.0.7

Last Reset....................................... Power on reset

System Up Time................................... 0 days 2 hrs 23 mins 22 secs

System Timezone Location.........................

Current Boot License Level....................... base

Current Boot License Type........................ Permanent

Next Boot License Level.......................... base

Switch Configuration

802.3x Flow Control Mode......................... Disable

FIPS prerequisite features....................... Disabled

secret obfuscation............................... Enabled

                                                         Strong Password Check Features:

         case-check ...........Enabled

         consecutive-check ....Enabled

         default-check .......Enabled

         username-check ......Enabled

Press Enter to continue or <ctrl-z> to abort

Network Information

RF-Network Name............................. MEC

Web Mode.................................... Disable

Secure Web Mode............................. Enable

Secure Web Mode Cipher-Option High.......... Disable

Secure Web Mode Cipher-Option SSLv2......... Enable

OCSP........................................ Disabled

OCSP responder URL..........................

Secure Shell (ssh).......................... Enable

Telnet...................................... Disable

Ethernet Multicast Forwarding............... Disable

Ethernet Broadcast Forwarding............... Disable

AP Multicast/Broadcast Mode................. Multicast   Address : 0.0.0.0

IGMP snooping............................... Disabled

IGMP timeout................................ 60 seconds

IGMP Query Interval......................... 20 seconds

User Idle Timeout........................... 300 seconds

ARP Idle Timeout............................ 300 seconds

Cisco AP Default Master..................... Disable

AP Join Priority............................ Disable

Mgmt Via Wireless Interface................. Disable

Mgmt Via Dynamic Interface.................. Disable

Please Help !!!

1 ACCEPTED SOLUTION

Accepted Solutions

Hi,

Use only Key Index 1.

Try creating an new SSID or may be make this SSID itself for testing with open authetication (Security None) and verify if the DHCP works.

Regards

Najaf

View solution in original post

43 REPLIES 43
Stephen Rodriguez
Cisco Employee

Ok, so:

1.) is the scope exhausted on the 2960?

2.) what has changed recently?

3.) is dhcp proxy enabled or disabled?

HTH,
Steve

------------------------------------------------------------------------------------------------
Please remember to rate useful posts, and mark questions as answered

HTH,
Steve

------------------------------------------------------------------------------------------------
Please remember to rate useful posts, and mark questions as answered

1.) is the scope exhausted on the 2960?

-No Its working fine, the pc's which are connected to the switch they are able to get DHCP IP.

2.) what has changed recently?

-Nothing has changed.

3.) is dhcp proxy enabled or disabled?

-i checked it in the WLAN its enabled in it (If u are asking to check in WLAN)

Please still dind got any thing to get it working...

Proxy would either be Controller > Advanced or show dhcp proxy.

So you have only the one WLAN/interface?

HTH,
Steve

------------------------------------------------------------------------------------------------
Please remember to rate useful posts, and mark questions as answered

HTH,
Steve

------------------------------------------------------------------------------------------------
Please remember to rate useful posts, and mark questions as answered

:)

Scott Fella
Hall of Fame Guru

You try to delete the DHCP scope and add it back? The switch might be the issue. I have seen it before.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***

ok i will try by doing that... !

Tried deleting the DHCP scope on the switch and checked out still the issue is same..

Hi Amanulla,

Hope your WLC is configured as Trunk Interface, Please ensure that DHCP VLAN is allowed on the Trunk Links to the WLC and on all the path between WLC and DHCP switch.Also hope you dont have any interface which is configured on WLC with 0.0.0.0 address.

Regards

Najaf

Please rate when applicable or helpful !!!

yes it is a Trunking between the WLAN interface and to the Switch were it is connected...

I had removed the DHCP cope from the switch and configured on the router...

And rebooted the WLAN controller and NOW ! i am not getting the wifi SSID.

Please help on this !!!

Sorry,

You mean you are not able to view SSID on the wireless device? Is the SSID broadcasted? Can you get the configuration from WLC please?

Regards

Najaf

sorry, checked the broadcast SSID was uncheck and found the SSID.

But still not able to get the DHCP Ip address for the wifi clients

How to set the DHCP Server Ip address in the WLAN controller.

If i check that show dhcp proxy status i can see that the dhcp server is having the Ip address of the switch which was configured previously. but now the DHCP scope is on router and how can i change it to that ?

Hi,

This may help.

Regards

Najaf

Changed to the correct DHCP IP address and rebooted the Controller also..

But still clients are not getting the DHCP IP address.. froan  the router..

Sholud the DHCP proxy should be enabled or disabled on the WLAN controller, if i am using external DHCP Server..

or

Can i enable DHCP pool in the WLAN only for the Clients who connect to the wifi..  from the IP address which are not in the router DHCP pool (Excluded Ip address).. ?

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