Networking & Wireless forum

Question

Tablet disconnects and reconnects from RouterBoard's Wifi

by Sebastian Toro / June 16, 2015 7:53 AM PDT

Hello Tech Support,

We have a product that considers installing on a client’s room a Mikrotik RouterBoard 951G 2HnD hosting a wifi network with WPA2 PSK security connected to our client’s network and an Android tablet connected to the Mikrotik’s wifi network. This solution has been installed on dozens of our clients’ sites and we have never had any issues before.

Two weeks ago the all the rooms (four) inside one of our client’s building started to have wifi problems. After working great for several hours, each tablet would disconnect (¿or be dropped?) from the RouterBoard 951G 2HnD’s wifi network and then immediately connect. After the first disconnection (or being dropped) and reconnection the tablet would keep disconnecting (or being dropped) and reconnecting from the wifi for several minutes, which would end in a final disconnection and then no more reconnection intents.

The solution worked great for months but after we changed the tablet this started happening. At the beginning we thought this was because we had changed the tablet but after trying with another Android tablets and an Android cell phone even, the problem would still occur. We also replaced the RouterBoard 951G 2HnD with one that was working great at another office and it also started to show this unusual behaviour.

Finally, we took one of the four room’s Android tablet and RouterBoard 951G 2HnD, and installed them on one of our laboratories without modifying any configuration on both of them. After almost 24 hours the problem has not replicated.

I thought activating the Wireless Debug Logs would us show more relevant information and help us focus our investigation on the right direction but it didn’t. Next are the log records:

-# jun/16/2015 7:47:11 by RouterOS 6.23
-# software id = ZSTZ-RLUR
-#
jan/01/1970 20:03:17 interface,info ether1_Conexion_Hacia_LAN link up (speed 100M, full duplex)
jan/01/1970 20:03:17 interface,info ether2_Conexion_Hacia_terminal_VC link up (speed 100M, full duplex)
jan/01/1970 20:04:00 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: connected
jan/01/1970 20:04:01 dhcp,info dhcp1_My_Companys_Name assigned 192.168.89.2 to 0C:B3:19:29:08:13
jan/01/1970 20:04:09 system,error,critical router was rebooted without proper shutdown
jan/01/1970 20:04:20 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: disconnected, received deauth: sending station leaving (3)
jan/01/1970 20:04:29 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: connected
jan/01/1970 20:07:28 interface,info ether4_Conexion_Hacia_dispositivos_internos link up (speed 100M, full duplex)
jan/01/1970 20:07:41 system,info,account user admin logged in via winbox
jan/01/1970 20:17:48 system,info,account user admin logged in via winbox
jan/01/1970 20:17:50 system,info,account user admin logged out via winbox
jan/01/1970 20:19:01 system,info,account user admin logged in via local
jan/01/1970 20:19:28 system,info nat rule added by admin
jan/01/1970 20:19:31 system,info nat rule added by admin
jan/01/1970 20:19:31 system,info nat rule added by admin
jan/01/1970 20:19:31 system,info nat rule added by admin
jan/01/1970 20:22:51 interface,info ether4_Conexion_Hacia_dispositivos_internos link down
jan/01/1970 20:22:52 system,info,account user admin logged out via winbox
jan/01/1970 20:22:52 system,info,account user admin logged out via local
jan/01/1970 20:33:20 interface,info ether2_Conexion_Hacia_terminal_VC link down
jan/01/1970 20:33:23 interface,info ether2_Conexion_Hacia_terminal_VC link up (speed 100M, full duplex)
jan/01/1970 23:59:08 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: reassociating
jan/01/1970 23:59:08 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: disconnected, ok
jan/01/1970 23:59:08 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: connected
jan/02/1970 00:02:09 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: reassociating
jan/02/1970 00:02:09 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: disconnected, ok
jan/02/1970 00:02:09 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: connected
jan/02/1970 00:05:29 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: disconnected, received deauth: class 3 frame received (7)
jan/04/1970 15:20:45 system,info,account user admin logged in from 10.252.163.33 via winbox
jan/04/1970 15:37:52 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: connected
jan/04/1970 23:03:37 system,info,account user admin logged in from 10.252.163.33 via winbox
jan/04/1970 23:03:48 system,info log rule added by admin
jan/04/1970 23:04:07 system,info,account user admin logged out from 10.252.163.33 via winbox
jan/04/1970 23:07:23 system,info SNTP client configuration changed by admin
jun/15 15:53:43 system,info SNTP client configuration changed by admin
jun/15 18:09:25 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: disconnected, received deauth: class 3 frame received (7)
jun/15 18:09:41 wireless,debug wlan1_My_Companys_Name: 0C:B3:19:29:08:13 attempts to associate
jun/15 18:09:41 wireless,debug wlan1_My_Companys_Name: 0C:B3:19:29:08:13 in local ACL, accept
jun/15 18:09:41 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: connected
jun/15 18:15:29 wireless,debug wlan1_My_Companys_Name: 0C:B3:19:29:08:13 attempts to associate
jun/15 18:15:29 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: reassociating
jun/15 18:15:29 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: disconnected, ok
jun/15 18:15:29 wireless,debug wlan1_My_Companys_Name: 0C:B3:19:29:08:13 in local ACL, accept
jun/15 18:15:29 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: connected
jun/15 18:17:11 wireless,info 0C:B3:19:29:08:13@wlan1_My_Companys_Name: disconnected, received deauth: class 3 frame received (7)

Also, we did a spectrum analisis showing the usage of each channel (but only with networks with visible SSIDs) and the result was the following:



We have no idea where to keep looking and why is this problem happening. Any help or guidance will be deeply appreciated.

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Clarification Request
You do see that 1970 year code?
by R. Proffitt Forum moderator / June 17, 2015 3:01 PM PDT

Why the date matters, is all on the web.

Collapse -
Yes I do
by Sebastian Toro / June 18, 2015 6:28 AM PDT

Hello,

There is a change in the date because on a certain point we set the time of the device to know at what moment in time the events occurr. This is not a bug or something else.

Collapse -
That date can break WPA WPA2 authentication.
by R. Proffitt Forum moderator / June 18, 2015 7:52 AM PDT
In reply to: Yes I do

As you are developers I thought you might know that but maybe not?

Sorry if I don't dump a semester of network training here but it does stick out as a reason disconnects should occur.

Collapse -
date problem?
by Sebastian Toro / June 18, 2015 8:20 AM PDT

We have more than 100 Mikrotik devices working in the same scenario (no date/time set). None of them have shown this problem or have had any issues at all.

I mentioned previously that taking the devices out of the building makes the issue go away? How can this be a date problem them if 96 other devices are working with no date and don't have any problems?

All Answers

Collapse -
Answer
Small world.
by R. Proffitt Forum moderator / June 16, 2015 8:38 AM PDT

I have worked in embedded this and that for decades. When we see odd failures like that not only do we try to duplicate but we go back to our source code to see if the developer forgot something.

For example, if they didn't turn on all warnings and errors in the compiler. Some coders turn that off because they didn't know.

You're the product owner so you can get back to the source.
Bob

Collapse -
Not an application/source code problem
by Sebastian Toro / June 17, 2015 6:38 AM PDT
In reply to: Small world.

Hello R.Proffitt,

Thanks for answering though I don't think you get the problem. I stated previously: "At the beginning we thought this was because we had changed the tablet but after trying with another Android tablets and an Android cell phone even, the problem would still occur." This means that the issue is not related to the code of our application, only the lower layers of the OSI model are involved.

Any other ideas?

Collapse -
Good find.
by R. Proffitt Forum moderator / June 17, 2015 2:41 PM PDT

So you are reporting that Android tablets, all the new ones are incompatible with your gear.

Remember I'm an embedded electronics hardware and software person from pre-PC days to present day. I find it hard to accept that you think it's an OSI model issue as we have no issue on current models like the Nexus 7, etc.

Given it doesn't work on Android tablets (all?) then maybe this is not a good fit for your company. Try it on other gear, access points etc. I have a hard time accepting it's what you have written.

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