Lost connection, no beacons received

RouterOS Wireless Networking
1

I seem to be getting this message in my log at station end with more occurrence lately.

Setup is, RB133 with R52H card transmitting to identical @ 23km good LOS

Transmitter is 180° waveguide 13dBi, card at default power (25dBm), ap bridge, S/N 37, CCQ 68-55%, Signal -84 ave, 2412MHz freq, adaptive noise immunity ap client. AP log shows disconnected OK, reassociating, connected, whis is in unision with the station log of lost connection, no beacons received

Station hardware same, except 24dBi grid at horizontal polarity, S/N 15-16, CCQ 23-66.

We are in a very remote area, there shouldn’t be any other signal anywhere except my own. I work all radios at channel 1, 6, 11 where crossover may occur.

The beacon loss is intermittent, every few seconds for periods of 20 mins or so, then the link will stay up for many hours. I am trying to pin it to some atmospheric regularity, but that doesn’t seem to have any definity.

I have a similar link 2km shorter about 20° offset from the same transmitter, but is a WRT54GL with DD-WRT, on about the same signal stength, with a 19dBi pannel antenna set for horizontal polarity, that has a stable connection for weeks at a time!!! There are no fancy settings on that unit either, except the radio set to 200mw.

I have tried many things on the RB unit, getting very frustrated.

The wiki is marvelous, but couldn’t find much to help me resove this. I am going to try a different antenna, perhaps a similar pannel for a trial, but I would have thought the grid would have been the best.

Oh, ACk timeout set to dynamic on both.

Wondering if someone cold help please!

2

Did you enable Debug Logs to see more info about this disconnection?
http://wiki.mikrotik.com/wiki/Wireless_Debug_Logs

3

Thanks normis, will do, have done.

Will wait to see what gets logged. Will keep posted

4

Righto’, have got some logs that indicate that connectionwas lost, no beacons, then the wireless goes through a list of other signals from other AP’s, but vastly different frequencies. Two of these are mounted on the same tower, 180° waveguides, 2462, and 2437 MHz, 3m higher. Another is 54km distant, but would be at a non significant strength, the log doesn’t say.

One log line says must connetct to strongest signal which is the one it has just disconnected from.

Is there a way to extract the log as a file to analyze? Even to post here for some enlightening help?

Thanks again

PS, maybe I didn’t explain well enough in the original post, this RB133 has 3 radios, 2xAP’s as above to transmit via the waveguides, one as station, from the master transmitter 23km distant.

5

Your signal is too low, that’s why the connection is dropping.

6

Your signal is too low, that’s why the connection is dropping.

Well, yes, but why have I many others even worse, up to -90 that will stay connected for days on end, even weeks, without a dropout? I have a -92 on average, that regulalrly transmits 1-2mb reliably 24/7, possibly with 1-2 reconnections in that 7 day stretch.

I must admit, they aren’t Mikrotik!

7

signal should be around -60 to be fine, but anyway, i’m not convinced that it’s all of the problem. can you post some of the debug logs in their entirety ?

8

signal should be around -60 to be fine, but anyway, i’m not convinced that it’s all of the problem. can you post some of the debug logs in their entirety ?

Thank you normis. I am finding a great deal like you said. Tx end said ‘not in ACL’, so I copied the Rx end into the Access List. Same at the Rx end, debug said ‘not in connect list’, so have copied it into Connect List.

Now, to achieve what you ask, do I set the action to disk rather than memory? Then where would the file be to copy and paste in the post?

9

open the terminal in winbox, and type “/log print without-paging” and use the mouse to copy some of the logs. paste them here in the forum.

10

11:54:12 wireless,info 00:0C:42:18:D9:B0@wlan3: lost connection, no beacons received
11:54:14 wireless,debug wlan3: must select network
11:54:14 wireless,debug 00:0C:42:1F:3A:DC: on 2437 AP: yes SSID tooligie_hill-ap2 caps 0x421 rates 0xff0f basic 0xf MT: yes
11:54:14 wireless,debug 00:0C:42:1F:3A:C0: on 2462 AP: yes SSID tooligie_hill-ap1 caps 0x421 rates 0xff0f basic 0xf MT: yes
11:54:14 wireless,debug 00:0C:42:18:D9:B0: on 2412 AP: yes SSID Lock-sw-ap1 caps 0x421 rates 0xff0f basic 0xf MT: yes
11:54:14 wireless,debug 00:0C:42:18:EC:E7: on 2437 AP: yes SSID eol-lock-ap1-2 caps 0x421 rates 0xf basic 0x1 MT: yes
11:54:14 wireless,debug 00:0C:42:1F:49:C8: on 2412 AP: yes SSID eol-lock-ap1-1 caps 0x421 rates 0x3 basic 0x1 MT: yes
11:54:14 wireless,debug 00:0C:42:1F:3A:DF: on 2462 AP: yes SSID Lock-sw-ap2 caps 0x421 rates 0xff0f basic 0xf MT: yes
11:54:14 wireless,debug 00:02:6F:45:12:92: on 2437 AP: yes SSID Gunnamatta caps 0x421 rates 0xff0f basic 0xf MT: yes
11:54:14 wireless,debug 00:0C:42:1F:3A:F5: on 2437 AP: yes SSID eol-myoung-ap1-2 caps 0x421 rates 0xff0f basic 0xf MT: yes
11:54:14 wireless,debug wlan3: no network that satisfies connect-list, by default choose with strongest signal
11:54:14 wireless,info 00:0C:42:18:D9:B0@wlan3 established connection on 2412, SSID Lock-sw-ap1
15:50:09 wireless,info 00:0C:42:18:D9:B0@wlan3: lost connection, received deauth: authentication not valid (2)
15:50:11 wireless,debug wlan3: must select network
15:50:11 wireless,debug 00:0C:42:1F:3A:DC: on 2437 AP: yes SSID tooligie_hill-ap2 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:50:11 wireless,debug 00:0C:42:1F:3A:C0: on 2462 AP: yes SSID tooligie_hill-ap1 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:50:11 wireless,debug 00:0C:42:18:D9:B0: on 2412 AP: yes SSID Lock-sw-ap1 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:50:11 wireless,debug 00:0C:42:18:EC:E7: on 2437 AP: yes SSID eol-lock-ap1-2 caps 0x421 rates 0xf basic 0x1 MT: yes
15:50:11 wireless,debug 00:0C:42:1F:49:C8: on 2412 AP: yes SSID eol-lock-ap1-1 caps 0x421 rates 0x3 basic 0x1 MT: yes
15:50:11 wireless,debug 00:0C:42:1F:3A:DF: on 2462 AP: yes SSID Lock-sw-ap2 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:50:11 wireless,debug 00:02:6F:45:12:92: on 2437 AP: yes SSID Gunnamatta caps 0x421 rates 0xff0f basic 0xf MT: yes
15:50:11 wireless,debug 00:0C:42:1F:3A:F5: on 2437 AP: yes SSID eol-myoung-ap1-2 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:50:11 wireless,debug wlan3: no network that satisfies connect-list, by default choose with strongest signal
15:50:11 wireless,info 00:0C:42:18:D9:B0@wlan3 established connection on 2412, SSID Lock-sw-ap1
15:53:28 system,info,account user admin logged in from 203.34.11.10 via winbox
15:56:10 wireless,info 00:0C:42:18:D9:B0@wlan3: lost connection, connect-list changed
15:56:10 system,info wireless connect-list entry added by admin
15:56:11 wireless,debug wlan3: must select network
15:56:11 wireless,debug 00:0C:42:1F:3A:DC: on 2437 AP: yes SSID tooligie_hill-ap2 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:56:11 wireless,debug 00:0C:42:1F:3A:C0: on 2462 AP: yes SSID tooligie_hill-ap1 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:56:11 wireless,debug 00:0C:42:18:D9:B0: on 2412 AP: yes SSID Lock-sw-ap1 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:56:11 wireless,debug 00:0C:42:18:EC:E7: on 2437 AP: yes SSID eol-lock-ap1-2 caps 0x421 rates 0xf basic 0x1 MT: yes
15:56:11 wireless,debug 00:0C:42:1F:49:C8: on 2412 AP: yes SSID eol-lock-ap1-1 caps 0x421 rates 0x3 basic 0x1 MT: yes
15:56:12 wireless,debug 00:0C:42:1F:3A:DF: on 2462 AP: yes SSID Lock-sw-ap2 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:56:12 wireless,debug 00:02:6F:45:12:92: on 2437 AP: yes SSID Gunnamatta caps 0x421 rates 0xff0f basic 0xf MT: yes
15:56:12 wireless,debug 00:0C:42:1F:3A:F5: on 2437 AP: yes SSID eol-myoung-ap1-2 caps 0x421 rates 0xff0f basic 0xf MT: yes
15:56:12 wireless,info 00:0C:42:18:D9:B0@wlan3 established connection on 2412, SSID Lock-sw-ap1

Hope this helps noemis

Thanks again

11

which is the mac that is causing problems?

about the “no beacons” error you can read in the link I gave you:

“no beacons” - no beacons received from remote end of WDS link. Most likely > weak signal> , remote turned off, strong interference, some other RF related issue that makes communication impossible.

12

And this is from theTx end

11:54:10 wireless,info 00:0C:42:1F:3A:D1@wlan1: disconnected, ok
11:54:10 wireless,debug wlan1: 00:0C:42:1F:3A:D1 not in local ACL, by default accept
11:54:10 wireless,info 00:0C:42:1F:3A:D1@wlan1: connected
11:54:14 wireless,debug wlan1: 00:0C:42:1F:3A:D1 attempts to associate
11:54:14 wireless,info 00:0C:42:1F:3A:D1@wlan1: reassociating
11:54:14 wireless,info 00:0C:42:1F:3A:D1@wlan1: disconnected, ok
11:54:14 wireless,debug wlan1: 00:0C:42:1F:3A:D1 not in local ACL, by default accept
11:54:14 wireless,info 00:0C:42:1F:3A:D1@wlan1: connected
15:50:09 wireless,info 00:0C:42:1F:3A:D1@wlan1: disconnected, access-list changed
15:50:09 system,info wireless access-list entry added by admin
15:50:11 wireless,debug wlan1: 00:0C:42:1F:3A:D1 attempts to associate
15:50:11 wireless,debug wlan1: 00:0C:42:1F:3A:D1 in local ACL, accept
15:50:11 wireless,info 00:0C:42:1F:3A:D1@wlan1: connected
15:56:12 wireless,debug wlan1: 00:0C:42:1F:3A:D1 attempts to associate
15:56:12 wireless,info 00:0C:42:1F:3A:D1@wlan1: reassociating
15:56:12 wireless,info 00:0C:42:1F:3A:D1@wlan1: disconnected, ok
15:56:12 wireless,debug wlan1: 00:0C:42:1F:3A:D1 in local ACL, accept
15:56:12 wireless,info 00:0C:42:1F:3A:D1@wlan1: connected

13

which is the mac that is causing problems?

This one

00:0C:42:1F:3A:DF

14

I don’t see this MAC disconnection in the logs you pasted

15

Bump.

I’d be interested to learn if and if so how this problem was resolved as I have the same problem.

Logged at station

09:52:58 wireless,info 00:02:6F:4B:27:49@Elie: lost connection, no beacons received
09:53:00 wireless,debug Elie: must select network
09:53:00 wireless,debug 00:02:6F:4B:27:49: on 2412 AP: yes SSID Crail caps 0x431 rates 0xf basic 0x1 MT: yes
09:53:00 wireless,debug 00:02:6F:52:DB:D3: on 2442 AP: yes SSID Bobbery caps 0x431 rates 0xf basic 0x1 MT: yes
09:53:00 wireless,info 00:02:6F:4B:27:49@Elie established connection on 2412, SSID Crail
09:59:34 wireless,info 00:02:6F:4B:27:49@Elie: lost connection, no beacons received
09:59:36 wireless,debug Elie: must select network
09:59:36 wireless,debug 00:02:6F:4B:27:49: on 2412 AP: yes SSID Crail caps 0x431 rates 0xf basic 0x1 MT: yes
09:59:36 wireless,debug 00:02:6F:52:DB:D3: on 2442 AP: yes SSID Bobbery caps 0x431 rates 0xf basic 0x1 MT: yes
09:59:36 wireless,info 00:02:6F:4B:27:49@Elie established connection on 2412, SSID Crail
09:59:38 wireless,info 00:02:6F:4B:27:49@Elie: lost connection, no beacons received
09:59:40 wireless,debug Elie: must select network
09:59:40 wireless,debug 00:02:6F:4B:27:49: on 2412 AP: yes SSID Crail caps 0x431 rates 0xf basic 0x1 MT: yes
09:59:40 wireless,debug 00:02:6F:52:DB:D3: on 2442 AP: yes SSID Bobbery caps 0x431 rates 0xf basic 0x1 MT: yes
09:59:40 wireless,info 00:02:6F:4B:27:49@Elie established connection on 2412, SSID Crail
10:06:14 wireless,info 00:02:6F:4B:27:49@Elie: lost connection, no beacons received
10:06:16 wireless,debug Elie: must select network
10:06:16 wireless,debug 00:02:6F:4B:27:49: on 2412 AP: yes SSID Crail caps 0x431 rates 0xf basic 0x1 MT: yes
10:06:16 wireless,debug 00:02:6F:52:DB:D3: on 2442 AP: yes SSID Bobbery caps 0x431 rates 0xf basic 0x1 MT: yes
10:06:16 wireless,info 00:02:6F:4B:27:49@Elie established connection on 2412, SSID Crail
10:06:18 wireless,info 00:02:6F:4B:27:49@Elie: lost connection, no beacons received
10:06:19 wireless,debug Elie: must select network
10:06:19 wireless,debug 00:02:6F:4B:27:49: on 2412 AP: yes SSID Crail caps 0x431 rates 0xf basic 0x1 MT: yes
10:06:19 wireless,debug 00:02:6F:52:DB:D3: on 2442 AP: yes SSID Bobbery caps 0x431 rates 0xf basic 0x1 MT: yes
10:06:19 wireless,info 00:02:6F:4B:27:49@Elie established connection on 2412, SSID Crail
10:12:54 wireless,info 00:02:6F:4B:27:49@Elie: lost connection, no beacons received
10:12:56 wireless,debug Elie: must select network
10:12:56 wireless,debug 00:02:6F:4B:27:49: on 2412 AP: yes SSID Crail caps 0x431 rates 0xf basic 0x1 MT: yes
10:12:56 wireless,debug 00:02:6F:52:DB:D3: on 2442 AP: yes SSID Bobbery caps 0x431 rates 0xf basic 0x1 MT: yes
10:12:56 wireless,info 00:02:6F:4B:27:49@Elie established connection on 2412, SSID Crail
10:12:58 wireless,info 00:02:6F:4B:27:49@Elie: lost connection, no beacons received
10:12:59 wireless,debug Elie: must select network
10:12:59 wireless,debug 00:02:6F:4B:27:49: on 2412 AP: yes SSID Crail caps 0x431 rates 0xf basic 0x1 MT: yes
10:12:59 wireless,debug 00:02:6F:52:DB:D3: on 2442 AP: yes SSID Bobbery caps 0x431 rates 0xf basic 0x1 MT: yes
10:12:59 wireless,info 00:02:6F:4B:27:49@Elie established connection on 2412, SSID Crail


Logged at AP:

09:52:56 wireless,debug Crail: 00:02:6F:4B:27:44 attempts to associate
09:52:56 wireless,info 00:02:6F:4B:27:44@Crail: reassociating
09:52:56 wireless,info 00:02:6F:4B:27:44@Crail: disconnected, ok
09:52:56 wireless,debug Crail: 00:02:6F:4B:27:44 in local ACL, accept
09:52:56 wireless,info 00:02:6F:4B:27:44@Crail: connected
09:53:00 wireless,debug Crail: 00:02:6F:4B:27:44 attempts to associate
09:53:00 wireless,info 00:02:6F:4B:27:44@Crail: reassociating
09:53:00 wireless,info 00:02:6F:4B:27:44@Crail: disconnected, ok
09:53:00 wireless,debug Crail: 00:02:6F:4B:27:44 in local ACL, accept
09:53:00 wireless,info 00:02:6F:4B:27:44@Crail: connected
09:59:36 wireless,debug Crail: 00:02:6F:4B:27:44 attempts to associate
09:59:36 wireless,info 00:02:6F:4B:27:44@Crail: reassociating
09:59:36 wireless,info 00:02:6F:4B:27:44@Crail: disconnected, ok
09:59:36 wireless,debug Crail: 00:02:6F:4B:27:44 in local ACL, accept
09:59:36 wireless,info 00:02:6F:4B:27:44@Crail: connected
09:59:39 wireless,debug Crail: 00:02:6F:4B:27:44 attempts to associate
09:59:39 wireless,info 00:02:6F:4B:27:44@Crail: reassociating
09:59:39 wireless,info 00:02:6F:4B:27:44@Crail: disconnected, ok
09:59:39 wireless,debug Crail: 00:02:6F:4B:27:44 in local ACL, accept
09:59:39 wireless,info 00:02:6F:4B:27:44@Crail: connected
10:06:16 wireless,debug Crail: 00:02:6F:4B:27:44 attempts to associate
10:06:16 wireless,info 00:02:6F:4B:27:44@Crail: reassociating
10:06:16 wireless,info 00:02:6F:4B:27:44@Crail: disconnected, ok
10:06:16 wireless,debug Crail: 00:02:6F:4B:27:44 in local ACL, accept
10:06:16 wireless,info 00:02:6F:4B:27:44@Crail: connected
10:06:19 wireless,debug Crail: 00:02:6F:4B:27:44 attempts to associate
10:06:19 wireless,info 00:02:6F:4B:27:44@Crail: reassociating
10:06:19 wireless,info 00:02:6F:4B:27:44@Crail: disconnected, ok
10:06:19 wireless,debug Crail: 00:02:6F:4B:27:44 in local ACL, accept
10:06:19 wireless,info 00:02:6F:4B:27:44@Crail: connected
10:12:56 wireless,debug Crail: 00:02:6F:4B:27:44 attempts to associate
10:12:56 wireless,info 00:02:6F:4B:27:44@Crail: reassociating
10:12:56 wireless,info 00:02:6F:4B:27:44@Crail: disconnected, ok
10:12:56 wireless,debug Crail: 00:02:6F:4B:27:44 in local ACL, accept
10:12:56 wireless,info 00:02:6F:4B:27:44@Crail: connected
10:12:59 wireless,debug Crail: 00:02:6F:4B:27:44 attempts to associate
10:12:59 wireless,info 00:02:6F:4B:27:44@Crail: reassociating
10:12:59 wireless,info 00:02:6F:4B:27:44@Crail: disconnected, ok
10:12:59 wireless,debug Crail: 00:02:6F:4B:27:44 in local ACL, accept

This is a P2P backbone link between two sites. The station end is also running a point-to-multipoint AP at 2442MHz and the AP is also running a second AP at 2472MHz.

When the station end loses the connection it scans and reports two APs, viz the one it should connect to - Crail - and the one running right next to it - Bobbery. It correctly reassociates with Crail but gets bumped off again almost immediately. Is it the case that the adjacent AP ‘overwhelmes’ the correct link despite the frequency difference? (2412GHz vs 2442)

If so is there any way to stop this happening without changing frequencies?

16

Also, it’s very noticeable that the ‘interrupts’ are happening at quite regular intervals of around 6.5 minutes. Is this a clue?

17

Well, for what it’s worth I turned on Adaptive Noise Immunity at both ends of the link, enabled nstream and polling and disabled CSMA (whatever that is) and the problem went away.

Quite which of the above (or combination thereof) did the trick I don’t know, and whether the link quality/throughput will actually be worse as a result remains to be seen.

18

The disconnects will happen as a result of :

  1. The AP not being able to make out what the client was transmitting even throughout all the retransmit attempts.
  2. The Client not being able to make out what the AP was transmitting even throughout all the retransmit attempts.

This could be due to many things.
-90 can net OK results, if the frequency is 99% free (and by that; I mean the spectrum not 802.11).
Ultimately it is noise, or the perception of noise through your antenna, cabling, amplifiers, and radio cards which are filtered from the 802.11 signal by the radio card, and if the signal is integral the signal is accepted.

As everyone itterates over and over again, PLEASE check your antenna, connectors, cabling, and electronics.
If you do not have a spectral analyzer, do consider aquiring one, it is really the only truely good way to determine and measure noise.

19

Hi I have the same problem with no beacons received msg in CPE log

Situation:

RB411 as ap-bridge with clients connected to it and one RB433 (now as WDS station) as client(pseudobridge) and ap-bridge on second card.
Distance is cca 600m, signal cca -60 to -65 dbm on both ends.

At first I had:
[ap-bridge RB411 ROSv3.30 R52] — [pseudobridge RB433 ROSv3.25 R52]

It worked not bad :slight_smile:

I wanted to upgrade hardware and firmware so I turned off the MT AP RB411 and changed card to R52nM and updated to 4.16
After change RB433 started to have problems with beacons.
So I thought that upgrade would help, but I was wrong.

Now I have:
[ap-bridge RB411 ROSv4.16 R52nM] — [station-wds RB433 ROSv4.16 R52nM]

After cca 6.50 minutes station-wds disconnects and it’s log writes:
16:05:22 wireless,info [AP-MAC]@wlan1_CL: lost connection, no beacons received
16:05:24 wireless,info [AP-MAC]@wlan1_CL established connection on 2472, SSID [xxx]
16:05:28 wireless,info [AP-MAC]@wlan1_CL: lost connection, no beacons received
16:05:30 wireless,info [AP-MAC]@wlan1_CL established connection on 2472, SSID [xxx]

So I tried to

  • change standard to B/G and then to B
  • change signal strenghts
  • frequency
  • RTS/CTS
  • HT Guard from any to long
  • disable HT extension channel
  • turn on and off ANI on atheros cards

but nothing helped

So finally I tried to set Nstreme on both ends and it helped, but the other CPEs didn’t connect as expected.

So I don’t know what do do now - I have two thoughts:

-I’ve read that reset of RBs and set everything again could help.
-I thought about creating Virtual AP with Nstreme, but I don’t know if it’s achievable.

I don’t want to switch back to G standard. I also afraid of the same problem with older cards and ROSv4.16.
Thank for any help.

20

This thread should help (explains why):
http://forum.mikrotik.com/t/log-reassociating-disconnected-ok-connected/44784/1

These too (explains how to correct):
http://forum.mikrotik.com/t/nlos-5ghz/44270/1
http://forum.mikrotik.com/t/5-0rc9-lost-connection-medium-access-timeout/44770/1
http://forum.mikrotik.com/t/desperately-seeking-elucidation/44545/1

ADD: Since I have been posting it in other threads, it has been 5w2d1h20m37s since a disconnect. :smiley:
And this does not only apply to a-mode. If you use n-mode, the log message would be

16:05:22 wireless,info [AP-MAC]@wlan1_CL: lost connection, not polled too long

Hedy Lamarr was not only beautiful and talented, but very intelligent. That is why I vote Hedy Lamarr the “Most Dangerous Woman” of the 20th century.