Sometimes wireless - lost connection, no beacons received

ulikroessin · Wed Oct 19, 2011 2:34 am

Hello @ all,

my problem is that one of my wireless backbone-connectiones breaks two or three times a day. Sometimes for some seconds, sometimes for up to 2 minutes.
I switched on wireless debug for logging and it tells me this:

Mode: station wds

15:19:27 wireless,info 00:0B:6B:4F:58:26@wlan1: lost connection, no beacons received

15:19:29 wireless,debug wlan1: must select network

15:19:29 wireless,debug 00:0B:6B:86:C4:F5: on 5180 AP: yes SSID wds9 caps 0x431 rates 0xff00 basic 0x100 MT: yes
15:19:29 wireless,debug 00:0B:6B:35:CC:5E: on 5220 AP: yes SSID wds6 caps 0x431 rates 0xff00 basic 0x100 MT: yes
15:19:29 wireless,debug 00:0B:6B:57:0D:B7: on 5240 AP: yes SSID wds7 caps 0x431 rates 0xff00 basic 0x100 MT: yes
15:19:29 wireless,debug 00:0B:6B:86:C5:19: on 5320 AP: yes SSID plaza caps 0x431 rates 0xff00 basic 0x100 MT: yes

15:19:29 wireless,debug 00:0B:6B:4F:58:26: on 5260 AP: yes SSID wds5 caps 0x431 rates 0xff00 basic 0x100 MT: yes

15:19:29 wireless,debug wlan1: no network that satisfies connect-list, by default choose with strongest signal

15:19:29 wireless,info 00:0B:6B:4F:58:26@wlan1 established connection on 5260, SSID wds5

15:19:29 wireless,debug wlan1: failed to set bridge port for wlan1, reason: device already added as bridge port (6)

Mode: ap bridge wds

15:19:29 wireless,debug wlan3: 00:0B:6B:35:CC:45 attempts to associate

15:19:29 wireless,info 00:0B:6B:35:CC:45@wlan3: reassociating

15:19:29 wireless,info 00:0B:6B:35:CC:45@wlan3: disconnected, ok

15:19:29 wireless,debug wlan3: 00:0B:6B:35:CC:45 not in local ACL, by default accept

15:19:29 wireless,info 00:0B:6B:35:CC:45@wlan3: connected, wants WDS

The first part is from the board in mode=station-wds, the second part from the ap-bridge board. This logs I get over the hole disconnect-time.

I use the following constellation:

Both boards are RB 333, the ap-bridge board works with ROS 5.6 and the other with 5.4. The distance ist 25 km, frequency is 5260, antenas are both 20db-grids and the signal strength is 70 - 71 dBm. All the other time the connection works without problems.

I tried to change the frequency, I switched on the

Adaptive Noise Immunity

- nothing helps.

What does that mean:

no network that satisfies connect-list, by default choose with strongest signal
...
failed to set bridge port for wlan1, reason: device already added as bridge port (6)

Please help!

Saludos

Uli

ulikroessin · Thu Oct 20, 2011 2:05 pm

Hello again,

nobody any idea? I red a lot of articles but really not found a solution or what this logs would telling me and what to do. It not can be a big problem, because nearly the hole time a day works fine. But it is annoyed for me and los clientes if it cuts sometimes and I would like to learn about the reason(s).
It is not a problem with the Fresnelzone. I calculated this for this connection, its in maximum 19 m and I have towers for the antennas at high points at the area, at both sides a tower-high of 45 m and no hills, buildings, trees or anything else between.

Regards

Uli

ulikroessin · Fri Oct 28, 2011 11:34 pm

Also I changed the Modes

Station WDS to AP-Bridge

and the

AP-Bridge to Station WDS

-> the same thing.
Then I changed the settings for

Hw. Retries and Disconnect Timeout

- nothing news. For these setting I did not found recommended values. Only one time the tip to make it larger in backbone... But did not help.

In

Statistics

they can see, that at both sides the TX-values from

TX/RX-Frames and TX/RX-Hw-Frames

are different. The values for RX are nearly equal, for TX it is ~1/3 more Hw-Frames -> means, more error in ACK. But WHY? And why at both sides for TX?

WirelessRudy · Sat Oct 29, 2011 12:24 am

You have to read more in the manual and wiki and this forum re this issue.
Your problem is most probably a result of interference from other radio's using TDMA in same band with close to own working freq. channels.

Use 5.6 on both units, set ANI according unit's role, update firmware of boards, check through wireless scan which frequencies are in use and which ones are free.
Also check all radio settings.
Give a wireless config print out on this forum and we might see what more details can be fine tuned.

ulikroessin · Mon Oct 31, 2011 12:16 am

Hello WirelessRudy,

thank you for response. Changed to 5.7 at both boards, firmware is 2.18 at both - the newest.
Scan shows me only my own stations, because it is near the forest in an agricultural region. There are no other radios.

Give a wireless config print out on this forum and we might see what more details can be fine tuned.

AP-Side

/interface wireless
set 0 adaptive-noise-immunity=ap-and-client-mode allow-sharedkey=no \
antenna-gain=0 antenna-mode=ant-a area="" arp=enabled band=5ghz-a \
basic-rates-a/g=6Mbps basic-rates-b=1Mbps bridge-mode=enabled burst-time=\
disabled channel-width=20mhz compression=no country=no_country_set \
default-ap-tx-limit=0 default-authentication=yes default-client-tx-limit=\
0 default-forwarding=yes dfs-mode=none disable-running-check=no disabled=\
no disconnect-timeout=3s distance=dynamic frame-lifetime=0 frequency=5180 \
frequency-mode=manual-txpower frequency-offset=0 hide-ssid=no \
hw-fragmentation-threshold=disabled hw-protection-mode=none \
hw-protection-threshold=0 hw-retries=10 l2mtu=2290 mac-address=\
00:0B:6B:..... max-station-count=2007 mode=ap-bridge mtu=1500 name=\
wlan1 noise-floor-threshold=default nv2-cell-radius=30 \
nv2-noise-floor-offset=default nv2-preshared-key="" nv2-qos=default \
nv2-queue-count=2 nv2-security=disabled on-fail-retry-time=100ms \
periodic-calibration=default periodic-calibration-interval=60 \
preamble-mode=both proprietary-extensions=post-2.9.25 radio-name=\
000B6B...... rate-selection=legacy rate-set=default scan-list=default \
security-profile=profile1 ssid=wds5 station-bridge-clone-mac=\
00:00:00:00:00:00 supported-rates-a/g=\
6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps supported-rates-b=\
1Mbps,2Mbps,5.5Mbps,11Mbps tdma-period-size=2 tx-power-mode=default \
update-stats-interval=disabled wds-cost-range=50-150 wds-default-bridge=\
bridge1 wds-default-cost=100 wds-ignore-ssid=no wds-mode=dynamic-mesh \
wireless-protocol=unspecified wmm-support=disabled

Station-Side

/interface wireless
set 2 adaptive-noise-immunity=ap-and-client-mode allow-sharedkey=no \
antenna-gain=0 antenna-mode=ant-a area="" arp=enabled band=5ghz-a \
basic-rates-a/g=6Mbps basic-rates-b=1Mbps bridge-mode=enabled burst-time=\
disabled channel-width=20mhz compression=no country=no_country_set \
default-ap-tx-limit=0 default-authentication=yes default-client-tx-limit=\
0 default-forwarding=yes dfs-mode=none disable-running-check=no disabled=\
no disconnect-timeout=3s distance=dynamic frame-lifetime=0 frequency=5180 \
frequency-mode=manual-txpower frequency-offset=0 hide-ssid=no \
hw-fragmentation-threshold=disabled hw-protection-mode=none \
hw-protection-threshold=0 hw-retries=10 l2mtu=2290 mac-address=\
00:0B:6B:...... max-station-count=2007 mode=station-wds mtu=1500 name=\
wlan3 noise-floor-threshold=default nv2-cell-radius=30 \
nv2-noise-floor-offset=default nv2-preshared-key="" nv2-qos=default \
nv2-queue-count=2 nv2-security=disabled on-fail-retry-time=100ms \
periodic-calibration=default periodic-calibration-interval=60 \
preamble-mode=both proprietary-extensions=post-2.9.25 radio-name=\
000B6B...... rate-selection=legacy rate-set=default scan-list=default \
security-profile=profile1 ssid=wds5 station-bridge-clone-mac=\
00:00:00:00:00:00 supported-rates-a/g=\
6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps supported-rates-b=\
1Mbps,2Mbps,5.5Mbps,11Mbps tdma-period-size=2 tx-power-mode=default \
update-stats-interval=disabled wds-cost-range=50-150 wds-default-bridge=\
bridge1 wds-default-cost=100 wds-ignore-ssid=no wds-mode=dynamic-mesh \
wireless-protocol=unspecified wmm-support=disabled

If you need more information, please tell me. I don´t know how I can do more.

Thank you for helping.

Saludos

Uli

preachermanx · Wed May 23, 2012 6:29 pm

Have you been successful in resolving this issue? I am having exactly the same problem over a much shorter distance.

--
Patrick Roberts
preachermanx{AT}gmail.com

Sometimes wireless - lost connection, no beacons received

Sometimes wireless - lost connection, no beacons received

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