client connected to the AP but app does not talk to the server

aidotta · ‎03-20-2019

Hi all,

I have a connection problem between an application installed on a device and a server. The scenario is as follows:

APs are managed by WLC with different versions (7.4.x and 8.2.x). The device remains always connected, the ping is never lost to the server but the application installed on the device wrapped loses the connection with the server. This does not happen by cable.

What do you control?

Thanks for the support.

AI.

patoberli · ‎03-20-2019

What kind of application? Is it using some sort of Multicast or is it TCP or UDP?
Is the mobility group between the two WLC UP?
Why are you still using 7.4.x?

aidotta · ‎03-20-2019

@patoberli wrote:
What kind of application? Is it using some sort of Multicast or is it TCP or UDP?
Is the mobility group between the two WLC UP?
Why are you still using 7.4.x?

Hi Patoberli,

thanks for the reply. The application uses non-standard high tcp ports. The 2 WLCs are not connected to each other, they are independent. The WlcA has version 8.2.x and manages AP models 1800 and 1600, the WlcB has the 7.4.x version and manages AP models 1600 and 1200. I still use the 7.4.x version due to the AP 1200.

Regards

AI

patoberli · ‎03-20-2019

If the two WLC aren't connected (not even by mobility-group), then the client must get an new IP address when "roaming" to the other AP. It's possible that your application doesn't like that (the losing and gaining a new (could be the same) address).

Jurgens L · ‎03-20-2019

When you are connected via cable and doing the test, is the device using the same IP subnet as what you were testing with on the wireless?

aidotta · ‎03-20-2019

@Jurgens L wrote:
When you are connected via cable and doing the test, is the device using the same IP subnet as what you were testing with on the wireless?

Yes, uses an IP from the same subnet. The Device is found both in wifi and via cable in vlan 10 instead the server is in vlan 5. The traffic is local, the APs are configured in flexconnect mode and there is a router that acts as L3.