Not able to get DHCP IP via 2504 WLAN Controller

[Amanulla Khan]

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 !!!

[Scott Fella]

Well maybe the configuration was never saved and then it was rebooted without saving the changes?

Thanks,

Scott

Help out other by using the rating system and marking answered questions as "Answered"

[Stephen Rodriguez]

So, the config on the WLC looks fine.  You do not need to do the DHCP overide under the WLAN, just have the server configured in the interface.

But out of curiosity, can you look at the switch to see if someone has enabled teh dot1q native vlan tag command?

HTH,
Steve

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[Amanulla Khan]

Yes the switch Port (gig interface 1/0/2) to which the WLAN is connectd is dot1q. i.e., trunk port right....?

find this:

SW1#show interfaces trunk

Port        Mode             Encapsulation  Status        Native vlan

Gi1/0/2     on               802.1q         trunking      1

Port        Vlans allowed on trunk

Gi1/0/2     1-4094

Port        Vlans allowed and active in management domain

Gi1/0/2     1-3

Port        Vlans in spanning tree forwarding state and not pruned

Gi1/0/2     1-3

It is just a basic setup with a single vlan i.e., default vlan 1 and with router, WLAN and acces points.

[Stephen Rodriguez]

pull a show run of the switch, there might be a command that is vlan dot1q tag native.  it changes the behavior of the switch.  If it somehow got enabled, turn it off.

HTH,
Steve

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[Amanulla Khan]

The switchs sho running config....

as attachment...      

[Amanulla Khan]

weather dhcp server over ride checked are not but still not able to get the dhcp ip..

as the client laptops wifi adapter says limited connectivity and gets ip address of 169.17.x.x some thing..

i.e., no dhcp ip address.

[Amanulla Khan]

will this be the issue as i am using the thwo sets of passwords to get connected to the wifi. (Keysize=104bits, Key Index=1&2, Encryption key=*************, Key format= ASCII)

[kcnajaf · Accepted solution]

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

[Amanulla Khan]

Solved

Thank you Guys.

Changed the single set index key to access the wifi and got the dhcp working fine....

but recreated agin the same problem in order toconfirm it. as with two set of keys it dosent provide the dhcp itself where as with single set of index key it works fine..

Dont know why there is different set index keys option is it releated to some other things.

[GaneshPr1@microland.com]

Hi Guys,

Same issue, i do facing now. But My ssid is PSK enabled. Please help me to fix this.

[Scott Fella]

You should open a new thread and include information on your wlan setting and code you are running on your WLC and AP model. The more information the better. 

[GaneshPr1@microland.com]

Yes Scott, already thread is going on.

Subject line:

WLC 2504 SSID issue.

[Scott Fella]

That link doesn’t work for me.

[mauriceta]

Well i had this issue with cisco 2500 series wlan. the problem wasn't the wlan but at our core switch cisco 4503. in the specified vlan, there was a wrong ip helper:

switch(conf)#int vlanX(the vlan the ssid belongs to)

switch(conf-if)#ip helper-address x.x.x.x (this it the ip of the dhcp server)

switch(conf-if)#end

After doing this, the wlan got updates from the dhcp and users had IP and the connection was established.

Hope this helps too.