topic Re: WLC 1815i Error for connection in Wireless

WLC 1815i Error for connection

Ahmed ElShanab — Mon, 05 Jul 2021 19:32:10 GMT

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

Re: WLC 1815i Error for connection

Leo Laohoo — Sun, 20 Sep 2020 07:59:38 GMT

What firmware is the controller running on?

Re: WLC 1815i Error for connection

Ahmed ElShanab — Sun, 20 Sep 2020 08:28:11 GMT

firmware 8.5.140.0

Re: WLC 1815i Error for connection

balaji.bandi — Sun, 20 Sep 2020 08:28:44 GMT

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 ?

Re: WLC 1815i Error for connection

Leo Laohoo — Sun, 20 Sep 2020 08:41:42 GMT

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?

Re: WLC 1815i Error for connection

Ahmed ElShanab — Sun, 20 Sep 2020 08:42:51 GMT

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

Re: WLC 1815i Error for connection

Ahmed ElShanab — Sun, 20 Sep 2020 08:48:33 GMT

Clients are : PC and Laptop

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

Re: WLC 1815i Error for connection

balaji.bandi — Sun, 20 Sep 2020 09:39:50 GMT

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

Re: WLC 1815i Error for connection

Ahmed ElShanab — Sun, 20 Sep 2020 10:04:05 GMT

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

Re: WLC 1815i Error for connection

Leo Laohoo — Sun, 20 Sep 2020 10:19:41 GMT

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?

Re: WLC 1815i Error for connection

balaji.bandi — Sun, 20 Sep 2020 10:28:42 GMT

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.

Re: WLC 1815i Error for connection

Ahmed ElShanab — Sun, 20 Sep 2020 10:52:31 GMT

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

connected All (2.4 And 5)

Re: WLC 1815i Error for connection

Leo Laohoo — Sun, 20 Sep 2020 11:23:07 GMT

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

Re: WLC 1815i Error for connection

Scott Fella — Sun, 20 Sep 2020 11:16:20 GMT

How are the pings when you ping the gateways for 11.1 or 20.1? When a client is associated to the ssid, can they connect to resources on the network and the internet? How are the pings between wireless and wireless or wireless and a local wired server or wired device?

Re: WLC 1815i Error for connection

Ahmed ElShanab — Sun, 20 Sep 2020 11:32:16 GMT

RSSI & SNR value

Re: WLC 1815i Error for connection

balaji.bandi — Sun, 20 Sep 2020 11:35:25 GMT

Can you also share ping results to .1 gateway? is this good? is the same device connect to other AP and Controller works good?

Looks for me you get alternative ping success, Do you have a topology map, (not sure as of now, there may be routing loops i see (but we need your topology map).

Re: WLC 1815i Error for connection

Ahmed ElShanab — Sun, 20 Sep 2020 11:41:52 GMT

The ping to 11.1 or 20.1 is very stable, I can ping from any vlan to another as well, only

Controller and APs have packet loss.

Re: WLC 1815i Error for connection

Leo Laohoo — Sun, 20 Sep 2020 11:57:35 GMT

Why is the AP operating on Channel 5?
Why is the AP operating on 2.4 Ghz?
What happens if the wireless clients are connected using 5.0 Ghz?
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!

Re: WLC 1815i Error for connection

Ahmed ElShanab — Thu, 01 Oct 2020 06:41:04 GMT

The problem is I found to interface vlan 20 with same ip on 2 different Switches.

when I removed one everything become okay.