Wireless Devices with Local Host IP Address as DNS address and Losing Connections

Salonge
Salonge used Ask the Experts™
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I have a site that uses a Cisco Wireless Lan Controller.  We have 3 access points that attach to the controller.  The controller is not set up as the DHCP and all the access points have static IP's.  About a month ago, the wireless devices were dropping their connection and no one seem to understand why.  Once the connection was dropped, the user could connect wired and get back on and then I would put a static IP into the wireless adapter and the computer worked fine.  I noticed every time I made this change, I would get the standard message that there were multiple networks connected.  I later discovered that the WLC was also sending out IP's.  I turned that feature off and the devices now connect to the correct DHCP server which is set up on the router.  I am still having the issue with devices dropping connections and I noticed that the DNS IP address is set to 127.0.0.1.  I have no idea why that is being changed.  I have checked my router and that is fine.  I have checked my WLC and everything appears to be fine.  No one has access to this device but me and I don't see any setting that would cause this.  Any thoughts?
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JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
The controller is not set up as the DHCP and all the access points have static IP's   <-- Correct.

… to the correct DHCP server which is set up on the router   <-- If there is no Server, this is fine. If you have a Server, it should do DHCP and DNS.

I turned {the WLC} feature off  <-- Good.

the DNS IP address is set to 127.0.0.1.   <-- Same as before if you have a Server.

So at this point, I suggest you update Firmware on the Router, the Wireless Controller and the Access Points (all devices), restart them and check the settings.

Author

Commented:
Thank you for responding.  My devices are all up to date with firmware.  My router handles the DHCP and DNS.  This seems only to be happening to devices using wireless.  To answer your questions - Correct, the WLC is not set to DHCP and my Access Points all have static IPs.  The DNS switch just started happening.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
The controller is Cisco.  What make / model is the Router? Is it feasible to test with a different router?
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Author

Commented:
All the devices are Cisco.  We have 16 sites and all use the exact same devices and configuration with no issues.  This site had no issues until about a month ago.  Is it possible that the devices are connecting to another wireless device, hotspot or rouge device.  The WLC shows a list of rouge devices.  The WLC is in an office complex, but if that were the case, then the IP's would change, I guess.  This is baffling.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Is it possible that the devices are connecting to another wireless device, hotspot or rouge device

Yes.

Internally, get Advanced IP Scanner (Famatech) - free.  Install and scan your network for all internal devices.

On one or two devices, test deleting wireless profiles.  Open an admin command prompt.

Netsh Wlan show profiles.

Netsh Wlan delete profile name="profile name"  for all profiles.

Set up a new profile and test.

Make certain your devices have not been set up to be wireless hotspots.

Author

Commented:
Thank you.  I will do this.  I am traveling to the site later today and will update you.  Thank you again.

Author

Commented:
The problem was in my router.  I restarted it and everything cleared out.
Commented:
The problem was in the router.

Author

Commented:
John was extremely helpful in helping me find a solution.  Please award points.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
You can go back to the question and award points there. Let us know if you need help

Author

Commented:
I don't see where that option is.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Same spot where you awarded bonus points which you have done. Thank you.

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