No DHCP request or Acknowledgement

Serpent2010 · ‎09-11-2023

Good day,

I have couple of devices are connected to AIR-AP3802I-B-K9 then to WLC 9800.

Capturing trrafic on WLC-9800 17.9.3 and the Switch show the following

The captures showed the DHCP server kept sending unique offers to the devices.

The capture from the WLC showed the discover & offer packets were recieved.

The capture from the switch showed the offer packets only.

Both WLC & switch showed no request or acknowledgment packets.

I moved the AP to WLC 8540- 8.5.182.105, and the devices get connected rightaway with no issue.

Any advice?

Thanks

marce1000 · ‎09-11-2023

- Have a checkup of the WLC 9800 configuration with the CLI command show tech wireless ;feed the output into :
https://cway.cisco.com/wireless-config-analyzer/

Pick a client , and perform (client) debugging according to : https://logadvisor.cisco.com/logadvisor/wireless/9800/9800ClientConnectivity
You can have client debugs analyzed with : https://cway.cisco.com/tools/WirelessDebugAnalyzer/

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Serpent2010 · ‎09-12-2023

I uploaded the show tech wireless to the analyzer and "run", but no result

marce1000 · ‎09-12-2023

>...I uploaded the show tech wireless to the analyzer and "run", but no result
- Remember to use show tech wireless for WirelessAnalyzer not (simple) show tech , neither show tech-support

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Serpent2010 · ‎09-12-2023

Yes it is.

marce1000 · ‎09-12-2023

- You can attach it here , I will have a look at it ,

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Serpent2010 · ‎09-13-2023

It is not recommended to be on the public website

marce1000 · ‎09-13-2023

- You can also attach it to me within a private message,

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Rasika Nayanajith · ‎09-12-2023

Hope you followed 9800 best practices & no SVI defined for wireless user vlans on 9800
https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9800-series-wireless-controllers/guide-c07-743627.html#Wirelessclientinterfaces

IP helper address define on upstream switch (L3 device) and 9800 acting as a L2 device

HTH
Rasika
*** Pls rate all useful responses ***

Serpent2010 · ‎09-13-2023

FYI, I opened a ticket with the Cisco TAC, and for four months they were unable to resolve it.