CapsMan devices disconnecting

andlommy · June 3, 2015, 4:31pm

Hi!

I’ve setup a capsman between a RB2011UAS-2DnD and RBcAP2n

both running 6.29, named LocalRouter and WirelessExtender

[admin@MikroTik] > caps-man actual-interface-configuration print 
Flags: M - master, D - dynamic, B - bound, X - disabled, I - inactive, R - running 
 1   BR name="LocalRouter_GuestWLAN" mtu=1500 l2mtu=1600 mac-address=D6:CA:6D:6E:AF:FF arp=enabled radio-mac=00:00:00:00:00:00 master-interface=LocalRouter configuration.mode=ap configuration.ssid="CP_Guest" configuration.tx-chains=0,1,2 
        configuration.rx-chains=0,1,2 configuration.country=united kingdom security.authentication-types=wpa2-psk security.encryption=aes-ccm security.group-encryption=aes-ccm security.passphrase="xxxx" 
        datapath.client-to-client-forwarding=yes datapath.bridge=vlan18-bridge-GuestVLAN channel.frequency=2437 channel.width=20 channel.band=2ghz-b/g/n channel.extension-channel=Ce 

 1   BR name="WirelessExtender_GuestWLAN" mtu=1500 l2mtu=0 mac-address=4E:5E:0C:85:B5:DC arp=enabled radio-mac=00:00:00:00:00:00 master-interface=WirelessExtender configuration.mode=ap configuration.ssid="CP_Guest" configuration.tx-chains=0,1,2 
        configuration.rx-chains=0,1,2 configuration.country=united kingdom security.authentication-types=wpa2-psk security.encryption=aes-ccm security.group-encryption=aes-ccm security.passphrase="xxxx" 
        datapath.client-to-client-forwarding=yes datapath.bridge=vlan18-bridge-GuestVLAN channel.frequency=2437 channel.width=20 channel.band=2ghz-b/g/n channel.extension-channel=Ce

Devices associate to both devices - LocalRouter and WirelessExtender, however sporadically some mobiles (iphones reported so far) experience issues with wireless. Users are reporting wireless “flapping” or being “slow”

This is how it looks in the logs

Jun/03/2015	13:19:11	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN connected
Jun/03/2015	13:19:11	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN disconnected, registered to other interface
Jun/03/2015	13:20:47	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN connected
Jun/03/2015	13:20:47	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN disconnected, registered to other interface
Jun/03/2015	13:22:07	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN connected
Jun/03/2015	13:22:07	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN disconnected, registered to other interface
Jun/03/2015	13:22:54	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN connected
Jun/03/2015	13:22:54	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN disconnected, registered to other interface
Jun/03/2015	13:25:03	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN connected
Jun/03/2015	13:25:03	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN disconnected, registered to other interface
Jun/03/2015	13:25:14	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN connected
Jun/03/2015	13:25:14	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN disconnected, registered to other interface
Jun/03/2015	13:25:35	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN connected

Then it gets worse

Jun/03/2015	14:41:50	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN connected
Jun/03/2015	14:41:56	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN disconnected, 4-way handshake timeout
Jun/03/2015	14:48:30	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN connected
Jun/03/2015	14:48:30	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN disconnected, registered to other interface
Jun/03/2015	15:22:14	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN connected
Jun/03/2015	15:22:14	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN disconnected, registered to other interface
Jun/03/2015	15:22:23	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN connected
Jun/03/2015	15:22:31	caps,info	98:5A:EB:9E:F0:FD	@WirelessExtender_GuestWLAN disconnected, 4-way handshake timeout
Jun/03/2015	15:24:12	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN disconnected, group key timeout
Jun/03/2015	15:43:23	caps,info	98:5A:EB:9E:F0:FD	@LocalRouter_GuestWLAN connected

Another reason for “flapping” seen in the logs has been observed as “extensive data loss”.

In all cases users are quite near to both of the wireless devices

With no capsman nothing has been reported.

Any ideas?

avenn · June 4, 2015, 5:28pm

Hi,

It appears as though you are using same channel for both APs?. use separate for each through higher level interface config in CAPsMAN.

turn of extension channels - not enough on 2.4 for 2 Aps - could cause interference.

Check interference with freq scan

How close are the APs? You generally need decent dBm distance.

It might be that client is just roaming - check wireless message on mikrotik wiki.

Kind Regards

Aidan

avenn · June 4, 2015, 5:29pm

“extensive data loss” = interference usually.

do as per previous post

avenn · June 4, 2015, 5:31pm

wireless messages: http://wiki.mikrotik.com/wiki/Wireless_Debug_Logs

andlommy · June 5, 2015, 11:12am

thanks for the suggestion, trying that now.
Can a router perform normally when it hosts 2 access points are on different frequencies? Do i need to assign separate antennas for every AP?

avenn · June 5, 2015, 4:45pm

Each wireless interface within range of another (unless using a proprietary zero hand of solution like meru or ubiquiti) needs to use different non overlapping channels. Even if two interface are on same AP.

http://en.wikipedia.org/wiki/List_of_WLAN_channels

2.4Ghz use channel 1 or 6 or 11

On One AP:
interface 1 can use chan 1 = 2412
interface 2 can use chan 6 = 2437

Its much better to have 1 x 2.4ghz and 1 x 5ghz interface on one AP rather than 2 x 2.4ghz interfaces.

2.4Ghz channels are considered by many to be saturated. Only 3 x 20mhz available

5Ghz channels less crowded (for now!) with (depends where u live) 21 channels available

kind regards

Aidan Venn

avenn · June 5, 2015, 4:49pm

ignore the last message - it doesn`t answer the question!

antenna assignment is automatic to the card its physically plugged into.

do you mean interface?

You can configure these at many levels on CAPsMAN

I provision my APs based on MAC address

My frequency assignment is done at the interface level in CAPsMAN

kind regards

aidan

ognjen · March 12, 2018, 9:08am

Hello,
I was too looking how to resolve this problem.
My problem is resolved when I put Maquarade in my Core Mikrotik. (Exemp.,my computer have 192.168.0.1/24, AP 192.168.1.1/24)

[tester@MT3011L] > ip firewall nat  
[tester@MT3011L] /ip firewall nat> add chain=srcnat dst-address=192.168.1.1 action=masquerade disabled=no comment=MasqForAP

I just put this solution becouse I don’t see that on the forum.