WLC 1815i Error for connection

[Ahmed ElShanab]

I have an WLC 1815i and 21 AP 1815i 

All APs joined controller well but all Clients connected to SSIDs on this controller have more packet loss
please help me to solve this problem.

this configuration from management interface for controller:

(Cisco Controller) >show interface detailed management

Interface Name................................... management
MAC Address...................................... 0c:75:bd:d4:ed:60
IP Address....................................... 172.16.20.30
IP Netmask....................................... 255.255.255.0
IP Gateway....................................... 172.16.20.1
IP Address Type.................................. Static
External NAT IP State............................ Disabled
External NAT IP Address.......................... 0.0.0.0
Link Local IPv6 Address.......................... fe80::e75:bdff:fed4:ed60/64
STATE ........................................... NONE
Primary IPv6 Address............................. ::/128
STATE ........................................... NONE
Primary IPv6 Gateway............................. ::
Primary IPv6 Gateway Mac Address................. 00:00:00:00:00:00
STATE ........................................... NONE
VLAN............................................. untagged
Quarantine-vlan.................................. 0
Physical Port.................................... 1
DHCP Proxy Mode.................................. Global
Primary DHCP Server.............................. Unconfigured
Secondary DHCP Server............................ Unconfigured

--More-- or (q)uit
DHCP Option 82................................... Disabled
DHCP Option 82 bridge mode insertion............. Disabled
IPv4 ACL......................................... Unconfigured
IPv6 ACL......................................... Unconfigured
mDNS Profile Name................................ Unconfigured
AP Manager....................................... Yes
Guest Interface.................................. No
L2 Multicast..................................... Enabled

this configuration from the port connected to controller:

interface GigabitEthernet1/0/24
description Connected To Access Point
switchport trunk native vlan 20
switchport trunk allowed vlan 2-7,11,20
switchport mode trunk
end

Note: 

 GUI connected well and every thing is well if I take IP from controller and AP Subnet only

[Leo Laohoo]

What firmware is the controller running on?

[Ahmed ElShanab]

firmware 8.5.140.0

[Leo Laohoo]

Now tell us how you were able to detect "packet loss".  

What metrics did you use to come up with this conclusion? 

You mentioned "All clients".  What kind of clients?  How many?

What are their RSSI and SNR values?

[Ahmed ElShanab]

Clients are : PC and Laptop

I show packet loss when i did ping from any client to controller or any AP

[Leo Laohoo]

1.  What radio are the clients connected to (when doing the pings and experiencing PING loss)?  2.4 Ghz or 5.0 Ghz? 

2.  What are their RSSI and SNR values?  

[balaji.bandi]

Packet loss from where to where ? to controller or Gateway or what is the destination IP which you see packet loss?

where that device connected in the network, what devices in the path ?

[Ahmed ElShanab]

From any client to Controller, AP and the controller web GUI doesn't open easily.  

[balaji.bandi]

how about the case when you connect your PC same Switch where Controller connected? Does the GUI work?

as you mentioned others working as expected, what is that controller ? where they connected the same switch?

have you compared config?

check some configuration analyze:

https://community.cisco.com/t5/wireless-mobility-documents/wlc-config-analyzer/ta-p/3119057

[Ahmed ElShanab]

 GUI connected well and every thing is well if I take IP from controller and AP Subnet only

[balaji.bandi]

Now it comes to the interesting part, of the Lan side ok, the only issue with AP connected device.

can you post ipconfig /all from end device where you seeing the loss, and what is the IP address you pinging?

what speed you connected, what band it connected 2.4 or 5 ?

sometimes it takes very hard this kind of issue to solve. required more analysis config and the environment - so we may ask many questions to understand the environment bare with us.

[Ahmed ElShanab]

That is ipconfig /all from Device and the IP address I try to ping.

 

  connected All (2.4 And 5)

[Leo Laohoo]

Ok, those screenshots are of no use to me. 

I want the important bits of information:  RSSI & SNR value. 

What radio are these wireless NIC  operating on?  2.4 Ghz or 5.0 Ghz?  I saw your answer "connected all" and this is rubbish information. 

If you don't know how to get the RSSI, SNR and what radio they are operating on, post the complete output to the following command: 

netsh wlan show interfaces
netsh wlan show networks mode=bssid
netsh wlan show drivers

[Ahmed ElShanab]

RSSI & SNR value

  

[Leo Laohoo]

1. Why is the AP operating on Channel 5? 
2. Why is the AP operating on 2.4 Ghz?  
3. What happens if the wireless clients are connected using 5.0 Ghz?
4. Is the issue only happening to laptops?  What about tablets, smartphones, etc?

Realtek 8821AE wireless NC driver can be found HERE.  Update the firmware first and see if it makes any difference.

NOTE:  Look at the data rates enabled.  Gee whiz!