5Ghz AC: ghosts in wireless registration table

RouterOS Wireless Networking
1

Hello
We have installed full-mikrotik dual band APs: RB912UAG-2HPnD + R11E-5ac, and there is a strange behaviour: some 5Ghz clients stay forever in wireless/registration table (see picture attached). Of course the real devices are long gone, but they are stuck in the list with a virtual “last activity”.
If i reboot the AP, they all disappear. If i kick one of them, he won’t come back. They just don’t exist but they are here, messing with my SNMP stats.
As this is the first time we have this AND it’s the first time we use R11E-5ac/wireless-fp package, i guess there is a link..

I have some tests to do

  • Try different ROS versions
  • Disable AC on R11E card
  • Disable the “frequency: auto” feature which doesn’t work anyway with this card.
    ..
    But before i start this, maybe someone already has the answer..


    ROS 6.27
/interface wireless
set [ find default-name=wlan2 ] antenna-gain=5 band=5ghz-a/n/ac country=france default-forwarding=no disabled=no frequency=auto frequency-mode=regulatory-domain l2mtu=1600 \
    mode=ap-bridge name=wlan1_5 rx-chains=0,1 ssid="" tx-chains=0,1 wireless-protocol=802.11
set [ find default-name=wlan1 ] antenna-gain=4 band=2ghz-b/g/n country=france default-forwarding=no disabled=no frequency=auto frequency-mode=regulatory-domain l2mtu=1600 \
    mode=ap-bridge name=wlan2_24 rx-chains=0,1 ssid="" tx-chains=0,1 wireless-protocol=802.11
add default-forwarding=no disabled=no l2mtu=1600 mac-address=4E:5E:0C:12:7B:BD master-interface=wlan1_5 name=wlan_public_5 ssid=Hotel_WIFI wds-cost-range=0 \
    wds-default-cost=0
add default-forwarding=no disabled=no l2mtu=1600 mac-address=D6:CA:6D:EC:C3:85 master-interface=wlan2_24 name=wlan_public_24 ssid=Hotel_WIFI wds-cost-range=\
    0 wds-default-cost=0
Collapsing AP's (and Mikrotik support not reacting)
2

Disabling AC and setting mode to 5Ghz-only-N does not improve.
Disabling “frequency: auto” an setting static frequency does not improve.
Now trying different ROS versions..

3

have you checked the routerboard firmware version?

have you tried resetting wireless configuration on the R11e5-AC and reconfiguring it?

If that doesn’t fix it, next thing I’d do a reset to no defaults, reload configuration and see if it makes a difference.

4

Thanks for the ideas; just resetted the R11e-ac to factory default and reapplied settings.. now waiting 24 hours to see if there is improvement.

5

Please post whichever happens after those hours…

6

R11e-ac to factory default → fail, still ghost connections in AP.
Firmware was 3.22 already.
Now updated to ROS 6.29

7

I’d try a reset to defaults and reload the configuration. If problem persists, I’d make a supout.rif and open a ticket with support as is most likely some kind of bug related with your specific setup.

8

All tests failed so far; just created a ticket with Mikrotik support.

9

I’m getting this as well, but in 5Ghz N.

Is it possible to resolve this?

10

Enable ‘Keepalive Frames’ on the wireless interface (advanced mode).