mDNS Issue | WiFi devices can not communicate | C9800-40-K9 | 17.9.5

[CoachChan]

Hello Everyone,

I have a problem that has stumped me. I am working on getting a Nursing Simulation Lab up and running. This requires all devices (LAN and Wireless) to be on the same subnet and communicate via custom mDNS services. I have everything works other than two devices. When testing these two devices I came up with the following results,

NOTE: "SimPad" is a custom OS Tablet and "Baby" is a mannequin that the tablet connects too.

1. SimPad LAN --> Baby LAN | Successful

2. SimPad LAN --> Baby Wifi| Successful

3. SimPad Wifi --> Baby LAN | Failure

4. SimPad Wifi --> Baby Wifi | Failure

The goal is to keep everything working while getting the SimPad and Baby to communicate Wi-Fi to Wi-Fi (# 4). I will provide any information needed to help with this issue. Attached are some screenshots I think might help with diagnosis.

[marce1000]

 - You may find this useful : https://www.ciscolive.com/c/dam/r/ciscolive/global-event/docs/2024/pdf/TACENT-2019.pdf

 M.

[Rich R]

Check all the notes in https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/technical-reference/c9800-best-practices.html

Check your config with the Config Analyser (link below) - use output of "show tech wireless".

Get a packet capture of all the traffic between the devices when they're working and then get a packet capture of all the traffic between the devices when they're not working and then compare the two captures to see what's missing and getting dropped or any other differences.  At least that will give you some idea of what's not working and then you can concentrate on how to resolve that.

[Leo Laohoo]

(Cold) Reboot the APs.  

Could be C.SCwb16423