RB751U-2HnD - poor wireless performance & problems

taloot · Sat Jul 28, 2012 6:54 am

i bought 20 units, 3 hours project, takes from me 5 days, and alot of expansise,

very bad soho device, a drawon flagship of mikrotik soho,

only workable on 2412 to 2427

other than that its waste of time,

hardware design bug, EVM and couple of readings should be tested before release a broken arm device

i quit mikrotik 3 years ago, for similar issues,

installers and contactor have no time to waste submiting bug report

mikrotik good for p2p only,
ubnt for the reset of wireless deplyment, even in p2p if the signal is low go for ubnt

vadyalex · Thu Aug 09, 2012 11:54 am

Fix:

Change this parameter in wireless:
Advanced Distance=Dynamic
Tx Power--> TX power Mod: Card Rates

Which card rate to specify?
I tried different options and still have 2 mbps throughput over Wi-Fi...

saintofinternet · Fri Oct 26, 2012 9:57 am

does the poor wireless problem still persists?? with the latest update firmware??

Intrepid · Fri Oct 26, 2012 12:47 pm

I tested it some days ago with ROS 5.21, and got a little over 30mbit upload and download speed, with standard wireless settings.
Works ok for me

DBob · Sat Oct 27, 2012 6:28 pm

I tested it some days ago with ROS 5.21, and got a little over 30mbit upload and download speed, with standard wireless settings.
Works ok for me

30mbit is a little bit few from a device, which should generate lot more.
Or you meant 30mbyte

jandafields · Sat Oct 27, 2012 7:31 pm

30mbit is a little bit few from a device, which should generate lot more.
Or you meant 30mbyte

No, I don't think these devices are capable of doing 30mbytes. 30mbits, on the other hand, sounds normal for an Internet connection.

conky · Mon Nov 19, 2012 10:00 pm

What a huge disappointment. Just bought an RB751G-2HnD and the wifi performance is indeed crap.
Upgraded to latest router os 5.21 and no change.

Tested with 2 laptops, one connected with ethernet cable, the other via wifi, mas download speed that I can get when SCPing a file is 6-7MB/s.
Wifi signal: Link Quality=70/70 Signal level=-27 dBm

Even the cheaper Tplink (tl-wr1043nd) outperforms the routerboard.

Wit the tplink I get a stable 14MB/s (112mbit/s). Two times faster than the routerboard.

Is this because of the lack of proper antennas on the RB751?
Has anyone tested it with attaching external antenna?

Dear MikroTik, can you please respond?

turalo · Tue Nov 20, 2012 11:07 am

Same here, have few of them, Somehow the one in the office works for the most of times, but at home, and few at customers site have the same wifi problems, good fast connection but very poor quality, most of times no response, you request a website and wait, and wait, and wait then you understand that nothing happens

, it's like there is a black hole where all the data is lost on the way

it shows 100% of connection signal. But in reality is just rubbish.

try any cheap wifi router gives better result.

I have to admit that when it works for a short time its very good, in office for example the times that it works I can get up to 30mb up and down, while my total speed is 35mb up and down.
so if it works it works very good, but to get it to work si almost impossible, and if you will, then it wouldn't last for long.

conky · Wed Nov 21, 2012 1:08 pm

Is expecting an answer from MikroTik really too much to ask?
You have loads of unsatisfied customers here, what are you doing in order to address the issues?

Wed Nov 21, 2012 1:16 pm

what wireless data-rates it is using when you are doing the test? Make support output file and send that to support@mikrotik.com

turalo · Wed Nov 21, 2012 10:33 pm

what wireless data-rates it is using when you are doing the test? Make support output file and send that to support@mikrotik.com

I just made the supout file, I opened it with notepad++ it's coded, I need to know what info is there ? if my passwords are there too, then I would not want it to be seen by anybody...

anybody knows if the passwords are there too ?

Thu Nov 22, 2012 4:04 pm

what wireless data-rates it is using when you are doing the test? Make support output file and send that to support@mikrotik.com
I just made the supout file, I opened it with notepad++ it's coded, I need to know what info is there ? if my passwords are there too, then I would not want it to be seen by anybody...

anybody knows if the passwords are there too ?

you want your problem fixed or not? send the file and don't worry

turalo · Thu Nov 22, 2012 5:00 pm

Easy for you to say... I'll change the passeord first, and will make a new file.
I had bad experiance with kolmisoft, our password were misused by one
Of their workers, then i lost almost 1000 eu.

Fri Nov 23, 2012 9:30 am

Password is not saved in that file. You can use online supout.rif viewer to check yourself (supout.rif viewer is in your mikrotik.com account)

hondavf100f · Tue Dec 04, 2012 12:02 am

Have same problems as everybody else in here...
My RB751G-2HnD have poor download speeds...
I normaly gets about 15Mbps down and 30-40Mbps up. (have fibre connection 60/60)

Anybody have any sugestions to improve this config?

export compact 
# dec/03/2012 22:53:00 by RouterOS 5.22
# software id = xxxx-xxxx
#
/interface bridge
add l2mtu=1598 name=bridge1
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
add authentication-types=wpa-psk,wpa2-psk eap-methods=passthrough \
    management-protection=allowed mode=dynamic-keys name=yamaha \
    supplicant-identity="" wpa-pre-shared-key=xxxxxxxxxxxxxx \
    wpa2-pre-shared-key=xxxxxxxxxxxxxx
/interface wireless
set 0 band=2ghz-b/g/n disabled=no frequency=2437 l2mtu=2290 mode=ap-bridge \
    security-profile=yamaha ssid=yamaha
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=wlan1
/ip dhcp-client
add default-route-distance=0 disabled=no host-name=wifi interface=ether1 \
    use-peer-dns=no
/ip firewall service-port
set ftp disabled=yes
set irc disabled=yes
/ip service
set "" disabled=no port=22
/system clock
set time-zone-name=Europe/Oslo
/system identity
set name=WiFi
/system leds
set 0 interface=wlan1
/system ntp client
set enabled=yes mode=unicast
/tool bandwidth-server
set enabled=no
[root@WiFi] >

xmanuw · Wed Dec 19, 2012 6:04 pm

I am really stunned that Mikrotik isn't doing anything about this topic. The problem is present in all versions and it seems Mikrotik is not even trying to fix this.

Unfortunately this leaves most people no choice than to switch vendors...
I'm really interested in the development here, but it seems Mikrotik is not interested in keeping it's customers.

As the issues persist I'm thinking maybe this whole thing is a architectural error and cannot be fixed by software. At least it would be nice to admit that... So the customers are not fooled any more...

turalo · Wed Dec 19, 2012 10:01 pm

The problem with mikrotik is simple, they have opened the box of pandora and dont understand that not everyone is able to set everything right even with 10 years of experiance in this sector.
With many diplomas and certificates of like ccna mcsa etc... So there are so many options open, which are just not needed to be open, they have to be set well by default and closed off, and if and only if somebody needs to see / change them, then they should give a separate acces to it. For the normal IT guy, who just wants to diploy this in an office / company situation it's not needed to have all those options and get lost in them.
I personally love some of tools of Mikrotik, tools like torch etc... but further ? nothing special, many many many options which just waste my time when setting them to the right settings, this is all done in all other vendors. Specially I was disappointed to see that there is no board with built in support for vdsl / adsl or voip fxo ports.

So that's why I heard about mikrotik for the first time just few months ago. working in this field for so many years

and hear about them just few months ago, I dont consider myself as outof dated IT guy

I work with many different brands and types, also buying, selling, supporting etc...

So I gues, yes they have some problems with understanding the market, I dont thinkn they are not worth it, but they indeed need to get awake, and think better about different types of users / markets.

Thu Dec 20, 2012 9:46 am

hondavf100f please make this command: /interface wireless print advanced

basically the speed depends also on the laptop. many laptops only have one chain (antenna) and don't support wide channels (40MHz), which limits the maximum air rate to 65Mbit, for example testing at this rate with single TCP connection will give you some 15Mbits. So please tell us how you test this.

PastuhMedvedey · Thu Dec 20, 2012 7:46 pm

I use the following configuration radio interface.
In this good speed. The clients netbook "Aspire d257".

My config :

[admin@MikroTik] /interface wireless> export compact
# dec/20/2012 19:32:17 by RouterOS 5.22
# software id = 5Y9M-CTS4
#
/interface wireless security-profiles
set [ find default=yes ] group-ciphers="" unicast-ciphers=""
add authentication-types=wpa2-psk eap-methods=passthrough mode=dynamic-keys \
name=profile1 supplicant-identity="" wpa2-pre-shared-key=xxxxxxxxxxxx
/interface wireless
set 0 adaptive-noise-immunity=ap-and-client-mode band=2ghz-onlyn \
default-authentication=no default-forwarding=no disabled=no distance=\
indoors frequency=2447 ht-guard-interval=long ht-rxchains=0,1 \
ht-txchains=0,1 hw-protection-mode=rts-cts l2mtu=2290 max-station-count=\
10 mode=ap-bridge periodic-calibration=enabled \
periodic-calibration-interval=10 scan-list=default security-profile=\
profile1 ssid=MTwireless tx-power=5 tx-power-mode=card-rates \
wireless-protocol=802.11
/interface wireless nstreme
set wlan1 disable-csma=yes enable-nstreme=yes
/interface wireless access-list
add interface=wlan1 mac-address=74:F0:6D:07:FF:0D
add interface=wlan1 mac-address=78:92:9C:61:30:42
/interface wireless sniffer
set multiple-channels=yes
/interface wireless snooper
set receive-errors=yes

In the image below you can see the speed of downloading torrent files
ISP-PROVIDER -> pptp -> nat -> wifi -> aspired257

turalo · Thu Dec 20, 2012 10:41 pm

I would like to make one important note, the problem of wireless is not just everywhere and every time.
In my case in office it works perfect, with all pc's, mobiles, ipads etc... all perfect.
But at home, and on many other location it does not, I use same config as in office in other locations, also same firmware version etc...
Problem is that it's not possible to use a backup file, from one mikrotik on another, it brakes the settings corrupts some of them, so
every time you have to set it again, so far I know I have set all routers the same way but only 1 at office works fine, all others a shit with wifi.
That's why I'm saying that they have made it unnecessary difficult enabling all options by default.
in our office even thru 3-4 wals it works perfect. while a decrypt router which we payed 200 Europe for did not even reach 1 wall with good quality.

Neilson · Fri Dec 21, 2012 12:58 pm

@PastuhMedvedey

I think if you look at the details from the registration table you see that normis put you on the right track, you seem to be connected single antenna and 20mhz channels so you are only connected at "radio rate" 65Mbps.

This will limit your theoretical performance and also your real world performance. I would advise using wired connections for your torrenting and indeed whenever possible. Wireless is a wonderful technology but it has its place and time like everything else and the benefits of portability etc do come with drawbacks.

Infrastructure links use every possibly tech and fixed positioning, clear line of sight, multiple chains, wide channels etc to provide the rock steady performance we strive to give which cant be guaranteed in other situations.

Regards
Alexander

miro10hr · Fri Dec 21, 2012 3:43 pm

I have the following problem (or it is a feature maybe?) with RB751U-2HnD.

I have 802.11b/g/n enabled since I have some legacy devices and some new devices. I was testing with one laptop with 802.11g wireless card, no other devices connected.

If I enable only chain 0 (antenna mode - antenna A), I get full 802.11g speeds. I was testing with a little program LAN speed test towards local server. The throughput I get is some 20 Mbps which is fine.

If I turn on chain 1 the signal is little bit stronger, but it seems like the connection is 802.11b. I can't get more then 5-6 Mbps throughput. With only that device connected. It doesn't matter if I change antenna mode, the results are poor.

If I connect some 802.11n devices the results are the same. No more then 5-6 Mbps of throughput. If chain1 and chain 0 are enabled I cannot get more then 5-6 Mbps of throughput.

I tried to upgrade to 6.0rc6, but behavior is the same.

Is this normal?

Here is print of wireless advanced

Flags: X - disabled, R - running 
 0  R name="wlan1" mtu=1500 mac-address=D4:CA:6D:55:C6:DD arp=enabled 
      disable-running-check=no interface-type=Atheros AR92xx 
      radio-name="RB751U_radio" mode=ap-bridge ssid="XXXXXXX" area="" 
      frequency-mode=manual-txpower country=no_country_set antenna-gain=0 
      frequency=2442 band=2ghz-b/g/n channel-width=20/40mhz-ht-below 
      scan-list=default wireless-protocol=802.11 rate-set=default 
      supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps 
      supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,
                    54Mbps 
      basic-rates-b=1Mbps basic-rates-a/g=6Mbps max-station-count=2007 
      distance=dynamic tx-power-mode=default noise-floor-threshold=default 
      nv2-noise-floor-offset=default periodic-calibration=default 
      periodic-calibration-interval=60 dfs-mode=none antenna-mode=ant-a 
      wds-mode=disabled wds-default-bridge=none wds-default-cost=100 
      wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled 
      bridge-mode=enabled default-authentication=yes default-forwarding=yes 
      default-ap-tx-limit=0 default-client-tx-limit=0 
      proprietary-extensions=post-2.9.25 wmm-support=disabled hide-ssid=no 
      security-profile=Xxxxxx disconnect-timeout=3s on-fail-retry-time=100ms 
      preamble-mode=both compression=no allow-sharedkey=no 
      station-bridge-clone-mac=00:00:00:00:00:00 ht-ampdu-priorities=0 
      ht-guard-interval=any 
      ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,
                 mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15,mcs-16,mcs-17,
                 mcs-18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23 
      ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 
      ht-txchains=0 ht-rxchains=0 ht-amsdu-limit=8192 ht-amsdu-threshold=8192 
      tdma-period-size=2 nv2-queue-count=2 nv2-qos=default nv2-cell-radius=30 
      nv2-security=disabled nv2-preshared-key="" hw-retries=7 
      frame-lifetime=0 adaptive-noise-immunity=none 
      hw-fragmentation-threshold=disabled hw-protection-mode=none 
      hw-protection-threshold=0 frequency-offset=0 rate-selection=advanced 
      multicast-helper=default

Dobby · Sat Dec 22, 2012 11:37 am

Hello miro10hr,

please at first don´t get me wrong, my English skills are not the best, I don´t want to kidding you and/or bothering with you. but did ever thought about that you was buying a to low sorted device? Is it perhaps not better better for you to get a RB435G or a RB493G to be right sorted? Perhaps I am false with my thinking, but if this one device is not fitting your needs and wishes or plain is serving you the right throughput, should it be done by a more powerful RouterBoard?

I wish you all a merry Christmas and be healthy.

jlct021 · Sun Dec 23, 2012 7:24 pm

Same problem.

Signal strength shows up as great; but pings to the RB (from multiple devices / varying distances both near and far) and diabolical.

I don't want to disable a chain as if I understand this will reduce signal strength and I need all I can get for this install. (lots of walls etc)

Any body had any success in resolving this?

Sun Dec 23, 2012 8:25 pm

please tell me what signal you get. make sure botch chains are turned on, and distance is set to "indoors". also that your channels are set to 40mhz above.

jlct021 · Sun Dec 23, 2012 8:46 pm

Unit is on site at the moment. (Am going back tomorrow)

Signal strength was anywhere between -35 (if next to the rb) to -65 (if upstairs)

Didn't turn any chains off, didn't change the distance, changed the Chanel to 20mhz (all else is factory default with no other interfering devices)

No matter if I'm standing next to the rb, 5 or 10M away with clear LOS; the pings to the rb and thus internet etc are terrible.

Sun Dec 23, 2012 9:59 pm

bring it upstairs, set the channel width back to 40-up, make sure you actually have the 802.11n mode enabled (not b or g only). specifically make sure distance is set to "indoors" (might need to click "Advanced Mode").

The defaults are not perfect, so just make sure all this is set. Then make supout.rif file at the moment when device is downloading something, and signal is -65. Send supout.rif to support and/or attach here.

jlct021 · Wed Dec 26, 2012 5:45 pm

Reset to factory default, checked all was as you sugested and the crazy ping times to the rb seem to have stabalized. Will keep an eye on it and email supout.rif if happens again. Thanks

Boter · Fri Dec 28, 2012 8:03 pm

0  R name="wlan1" mtu=1500 mac-address=D4:CA:6D:20:D1:9D arp=enabled 
      disable-running-check=no interface-type=Atheros AR92xx 
      radio-name="D4CA6D20D19D" mode=ap-bridge ssid="wifree.si" area="" 
      frequency-mode=manual-txpower country=no_country_set antenna-gain=0 
      frequency=2412 band=2ghz-b/g/n channel-width=20/40mhz-ht-above 
      scan-list=default wireless-protocol=any rate-set=default 
      supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps 
      supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,
                    54Mbps 
      basic-rates-b=1Mbps basic-rates-a/g=6Mbps max-station-count=2007 
      distance=indoors tx-power-mode=default noise-floor-threshold=default 
      nv2-noise-floor-offset=default periodic-calibration=default 
      periodic-calibration-interval=60 dfs-mode=none antenna-mode=ant-a 
      wds-mode=disabled wds-default-bridge=none wds-default-cost=100 
      wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled 
      bridge-mode=enabled default-authentication=yes default-forwarding=yes 
      default-ap-tx-limit=0 default-client-tx-limit=0 
      proprietary-extensions=post-2.9.25 wmm-support=disabled hide-ssid=no 
      security-profile=default disconnect-timeout=3s on-fail-retry-time=100ms 
      preamble-mode=both compression=no allow-sharedkey=no 
      station-bridge-clone-mac=00:00:00:00:00:00 
      ht-ampdu-priorities=0,1,2,3,4,5,6,7 ht-guard-interval=any 
      ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,
                 mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15,mcs-16,mcs-17,
                 mcs-18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23 
      ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 
      ht-txchains=1 ht-rxchains=0,1 ht-amsdu-limit=8192 
      ht-amsdu-threshold=8192 tdma-period-size=2 nv2-queue-count=2 
      nv2-qos=default nv2-cell-radius=30 nv2-security=disabled 
      nv2-preshared-key="" hw-retries=7 frame-lifetime=0 
      adaptive-noise-immunity=none hw-fragmentation-threshold=disabled 
      hw-protection-mode=none hw-protection-threshold=0 frequency-offset=0 
      rate-selection=advanced multicast-helper=default

This is my current config. I have 100/100 internet. When I disable Tx chain 0 I only get about 30/30 of it through wireless, and about 50 over ethernet cable. Laptop have gbit NIC and SSD drive. I wonder if I can get more?

If I have Tx chain enabled I get about 10-30mbit's, so for now best choice is to disable Tx chain.

I have several 751 and 951 units, all seems to have same problem. I tried with different settings, but still can't get maximum or at least stable line.

Btw over wifi youtube is working very poor. Uni/Multicast works flawlesly through LAN, through WLAN works only multicast. Any ideas about that too?

I have multicast problem over SXT too.

Boter · Thu Jan 03, 2013 7:58 pm

Anything new about the topic?

Moc · Sun Jan 06, 2013 7:52 pm

Hi,

I've sent 2 supout.rif to support, here my ticket number : [Ticket#2013010666000081]

I've loaded them in the supout viewer and I noticed that both show high CPU load when this occur (over 50%).

I got another wireless access point in the mean time, and I've also noticed that the ping are lower on the other AP. 1.4ms average compare to about 3.8ms . The mikrotik will sometime answer at 1.4ms too, but it really rare. I've notice also the mikrotik will spike more often to higher than 3ms than the other router.

I've also installed the other router in a more complicated scenario : Wireless AP->Windows Server acting as a router -> Mikrotik, and it is farther away + including more obstacle(2 floor vs 1 simple wall).

I've tried to be close or farther from the mikrotik router and I got the same result.

I really hope this can tracked down and fixed once and for all !!!

Moc

myso · Mon Jan 28, 2013 9:27 pm

Hi guys,

I'm going to return my brand new RB751G-2HnD, because this is totally unacceptable:

All the clients are in the same room as the router! After lowering the TX power to 17dbm it got a little bit better, but still a lot worse than the SOHO d-link AP/router

Just out of curiosity, is it worth trying the new RB951G-2HnD, or is it the same crap as 751G with a faster CPU and bigger memory only?

I like mikrotik devices a lot, but this one's a big disappointment.

Thanks

Boter · Mon Jan 28, 2013 11:42 pm

RB951G-2n has really bad performance too... About 10/2 mbits. So i guess it's not much better.

ohara · Mon Jan 28, 2013 11:54 pm

RB951G-2n has really bad performance too... About 10/2 mbits. So i guess it's not much better.

Just to be clear, such device does not exist. Myso was asking aboud RB951G-2HnD. You are probably using RB951-2n.

myso · Tue Jan 29, 2013 12:04 am

Well, I have ordered 2pcs 951G-2HnD, I'll do the testing and let you know

This is a very frustrating issue...

Boter · Tue Jan 29, 2013 8:38 am

Ufcorse it does http://routerboard.com/RB951-2n

Tue Jan 29, 2013 9:29 am

Ufcorse it does http://routerboard.com/RB951-2n

This is not RB951G-2n, it is RB951-2n

phsjason · Wed Jan 30, 2013 6:02 am

Just an odd note.
After a lot of testing and configuring, I decided to 'reset' the wireless interface to defaults and see how it worked. Surprisingly, it was quite a bit faster @30Mbps each direction of throughput. When I looked at the defaults settings in 5.22, they were different than the defaults from previous versions. For instance, Only chain 0 TX/RX was enabled and it was set to antenna A versus having all chains enabled. Might be worth a shot to load 5.22, update routerboard FW, and then reset wireless interface to default, then test/tweak.

myso · Mon Feb 04, 2013 12:16 pm

Hi guys, I've done some testing on my own. I got the RB751G working at it's best by either enabling regulatory domain for my country or manually decreasing the TX power to 17dbm. After that, clients were able to associate at some interesting speeds (depending on client capabilities, mostly Apple devices and 3 laptops with intel and broadcom cards). The real throughput measured against a RB-SXTG--5HnD hooked up to the 751G gave a maximum throughput of 30mbps. Unfortunately that's the only test I managed to perform before returning the 751G to the dealer.

Now I'm running the 951G, again with regulatory domain set to my country. the association speeds are a little bit higher than before, no real throughput tests done yet.

I'll keep you up-to-date with this.

Michael

Dobby · Mon Feb 04, 2013 12:33 pm

mostly Apple devices and

try out to disable them sending TOS nad test it again please

I'll keep you up-to-date with this.

Would be fine.

kwagga · Sun Apr 07, 2013 11:52 am

Hi Guys,

Does anyone have an update regarding the poor 802.11n throughput of the RB751/RB951 devices?

I'm looking at buying a couple, but I've read so many threads with people battling with these units, I wonder if I shouldn't maybe avoid them completely?

myso · Sun Apr 07, 2013 9:54 pm

Hi I managed to do some tests using RB951G-2HnD today:

c:\soft>iperf -c 10.69.4.53 -P 20 -w 512k -t 60
------------------------------------------------------------
Client connecting to 10.69.4.53, TCP port 5001
TCP window size:  512 KByte
------------------------------------------------------------
[280] local 10.69.4.54 port 50095 connected with 10.69.4.53 port 5001
[264] local 10.69.4.54 port 50093 connected with 10.69.4.53 port 5001
[248] local 10.69.4.54 port 50091 connected with 10.69.4.53 port 5001
[232] local 10.69.4.54 port 50089 connected with 10.69.4.53 port 5001
[216] local 10.69.4.54 port 50087 connected with 10.69.4.53 port 5001
[200] local 10.69.4.54 port 50085 connected with 10.69.4.53 port 5001
[184] local 10.69.4.54 port 50083 connected with 10.69.4.53 port 5001
[168] local 10.69.4.54 port 50081 connected with 10.69.4.53 port 5001
[152] local 10.69.4.54 port 50079 connected with 10.69.4.53 port 5001
[136] local 10.69.4.54 port 50077 connected with 10.69.4.53 port 5001
[272] local 10.69.4.54 port 50094 connected with 10.69.4.53 port 5001
[256] local 10.69.4.54 port 50092 connected with 10.69.4.53 port 5001
[224] local 10.69.4.54 port 50088 connected with 10.69.4.53 port 5001
[208] local 10.69.4.54 port 50086 connected with 10.69.4.53 port 5001
[192] local 10.69.4.54 port 50084 connected with 10.69.4.53 port 5001
[176] local 10.69.4.54 port 50082 connected with 10.69.4.53 port 5001
[160] local 10.69.4.54 port 50080 connected with 10.69.4.53 port 5001
[144] local 10.69.4.54 port 50078 connected with 10.69.4.53 port 5001
[128] local 10.69.4.54 port 50076 connected with 10.69.4.53 port 5001
[240] local 10.69.4.54 port 50090 connected with 10.69.4.53 port 5001
[ ID] Interval       Transfer     Bandwidth
[184]  0.0-60.4 sec  57.0 MBytes  7.92 Mbits/sec
[216]  0.0-60.5 sec  54.3 MBytes  7.53 Mbits/sec
[168]  0.0-60.5 sec  52.3 MBytes  7.25 Mbits/sec
[272]  0.0-60.6 sec  50.9 MBytes  7.05 Mbits/sec
[256]  0.0-60.7 sec  38.3 MBytes  5.29 Mbits/sec
[240]  0.0-60.7 sec  40.3 MBytes  5.58 Mbits/sec
[144]  0.0-60.7 sec  30.2 MBytes  4.17 Mbits/sec
[224]  0.0-60.8 sec  39.7 MBytes  5.47 Mbits/sec
[128]  0.0-60.8 sec  50.3 MBytes  6.94 Mbits/sec
[160]  0.0-60.8 sec  39.9 MBytes  5.51 Mbits/sec
[200]  0.0-60.8 sec  36.6 MBytes  5.04 Mbits/sec
[192]  0.0-61.0 sec  11.8 MBytes  1.62 Mbits/sec
[248]  0.0-61.0 sec  11.9 MBytes  1.64 Mbits/sec
[232]  0.0-61.0 sec  11.9 MBytes  1.64 Mbits/sec
[136]  0.0-61.0 sec  11.8 MBytes  1.62 Mbits/sec
[280]  0.0-61.0 sec  12.0 MBytes  1.65 Mbits/sec
[264]  0.0-61.0 sec  12.0 MBytes  1.65 Mbits/sec
[152]  0.0-61.0 sec  11.8 MBytes  1.62 Mbits/sec
[176]  0.0-61.0 sec  11.8 MBytes  1.62 Mbits/sec
[208]  0.0-61.0 sec  11.8 MBytes  1.62 Mbits/sec
[ ID] Interval       Transfer     Bandwidth
[SUM]  0.0-61.0 sec   597 MBytes  82.0 Mbits/sec

6 WiFi 00:16:EA:xx:xx:xx no  -62dBm@1Mbps    135.... 5m37s

 int wirele print 
Flags: X - disabled, R - running 
 0  R name="WiFi" mtu=1500 mac-address=00:0C:42:xx:xx:xx arp=enabled interface-type=Atheros AR9300 mode=ap-bridge ssid="xxxx" frequency=2437 band=2ghz-b/g/n 
      channel-width=20/40mhz-ht-above scan-list=default wireless-protocol=unspecified wds-mode=disabled wds-default-bridge=none wds-ignore-ssid=no 
      bridge-mode=enabled default-authentication=yes default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0 hide-ssid=no 
      security-profile=xxxx compression=no

/interface wireless
set 0 adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=10 area="" arp=enabled band=2ghz-b/g/n basic-rates-a/g=6Mbps basic-rates-b=1Mbps bridge-mode=enabled channel-width=\
    20/40mhz-ht-above compression=no country="czech republic" 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=indoors frame-lifetime=0 frequency=2437 frequency-mode=regulatory-domain frequency-offset=0 hide-ssid=no \
    ht-ampdu-priorities=0 ht-amsdu-limit=8192 ht-amsdu-threshold=8192 ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 ht-guard-interval=any ht-rxchains=0,1 \
    ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15,mcs-16,mcs-17,mcs-18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23 \
    ht-txchains=0,1 hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 hw-retries=7 l2mtu=2290 mac-address=00:0C:42:B7:9B:23 max-station-count=2007 \
    mode=ap-bridge mtu=1500 multicast-helper=default name=WiFi 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=000C42xxxxxx rate-selection=advanced rate-set=default scan-list=default security-profile=xxxx ssid=xxxx 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=none wds-default-cost=100 wds-ignore-ssid=no wds-mode=disabled wireless-protocol=unspecified wmm-support=\
    disabled

/interface wireless manual-tx-power-table
set WiFi manual-tx-powers="1Mbps:17,2Mbps:17,5.5Mbps:17,11Mbps:17,6Mbps:17,9Mbps:17,12Mbps:17,18Mbps:17,24Mbps:17,36Mbps:17,48Mbps:17,54Mbps:17,HT20-0:17,HT20-1:17,HT20-2:17,HT20-3:17\
    ,HT20-4:17,HT20-5:17,HT20-6:17,HT20-7:17,HT40-0:17,HT40-1:17,HT40-2:17,HT40-3:17,HT40-4:17,HT40-5:17,HT40-6:17,HT40-7:17"

ddd · Mon Apr 08, 2013 4:27 am

From my experience if you are in a quiet environment with no other 2.4ghz interference they work perfectly.
However they don't seem to be able to deal with noisy environments compared to normal retail routers.

myso · Mon Apr 08, 2013 10:05 am

In my short experience (1x RG751G-2HnD and 1x RG951G-2HnD installation) - you have to very carefully select the TX power, either by regulatory domain or manually, because the radio is very powerful!!! Especially 1000mW on the 951G-2HnD!

Moc · Tue May 21, 2013 5:53 pm

I just upgraded to 6.0, and it appear that my wireless connectivity is finally usable/stable... This is just a 10min test I did... Will report back if I get issues under a longer usage period. But as 5.25 I still had issues with it.

I didn't factory reset when I upgraded from 5.25 to 6.0, so still running the default config of 5.25

Boter · Thu May 30, 2013 5:56 pm

It's the same with 6 here at my place. I still cant get more than 30/30.

jberen · Tue Aug 20, 2013 2:52 pm

Hi, any news on this topic more?, Boys Mikrotik?.

JB

Boter · Tue Aug 20, 2013 6:56 pm

I have send support.rif on mikrotik support mail, it's over a month... and still no answer

opalit · Wed Aug 21, 2013 2:15 am

I am experiencing a lot of problems with wireless devices connected to the RB751-2HnD.

I bought 3 units, in 2 different periods of time (2 when they became available several months ago, and one which arrived today). Local distributor said the last one is a new revision.

They are all configured as an access-point (802.11 b/g/n), and I get a lot of disconnections and very poor performances (high latency, variable between 40 and 3000ms, 100kbit/s throughput). If I manually set noise-floor to -90dB it becomes usable, but still I have reliability problems.

There are no interferences on the channel and devices work very well when connected to other access-points.

I already tried different ROS versions (5.6, 5.7, 5.9 and 5.14). All show the same behaviour on all units.

Does it happen only to me?

I had a RB751G 2HnD with poor Wireless, I downgraded to 5.16 and it is great

MiniMe · Tue Oct 08, 2013 11:42 pm

Have you tried to change in AP bridged mode from wlan<->ether1[WAN]-mode to wlan<->ether2[LAN]-mode?

I got much better wireless performance results with that combination.

shadowskippie · Mon Dec 02, 2013 12:25 pm

Good Afternoon

So, I've done quite a bit of testing with this problem and from what i can see it happens when you add the Wlan to the bridge int. not sure as to why it does this but when i remove the Wlan from the bridge and run it in a routed setup it functions better.

So, this is kind of where a little help is required, the more ppl testing this solution the better.
I took the Wlan out of the bridge, remove the SSID and hid it for good measure.
Then i added a virtualAP to the wireless and setup my wireless SSID there and added that instead to the bridge.

As of typing this it seems to be functioning okay but I've only had this solution running for about a day now.

So, try this solution and see if it helps fix the problem

Xcelsium · Tue Dec 03, 2013 6:32 pm

I tried removing the wlan from the bridge and using it as a router, it help but not too much still getting delay of 2000ms after 5 mins or with 1Mbps Trafic

Doing a more detailed troubleshooting ,changing preamble mode to long and change the HT-TX-chain=0 and HT-RX-chain=1 made to be more stable the communications,

Doing a 5min ping test to my RB951Ui-2HnD with 1 Mbps Download Traffic for 5min result on an average ping of 11ms, a max of 174ms and a min of 0 and a packet loss of 0%

Doint the same test with both TX and RX chain activated with 1Mbps download Traffic got average ping of 108ms max of 947ms and a min of 0ms and a packet loss of 10%

BR
Xcelsium

Boter · Wed Dec 04, 2013 6:45 pm

support mail still didnt answer. Maybe any unoficial answer when will poor wifi performance being solved?

Thu Dec 05, 2013 12:57 pm

we do not suggest to disable the RX for chain0 as you always need to have chain0 RX enabled in order to make stable wireless connection.
We suggest to reset the wireless interface configuration to default values, here is an example command how to do that:
/interface wireless reset-configuration wlan1

DeBergz · Mon Feb 03, 2014 10:27 pm

Do you find any solution to poor wifi perfomance?

I have a RB951G-2HnD and the wifi perfomance is so poor.
On speedtest.net with cable I have 9-11Mbps and on wifi 0.6-2 Mbps.

mivan · Sat Feb 08, 2014 8:18 am

too bad I read this after buying a 751u 2hnd .... my very first Mikrotik =P
just found this because of the same problems described in previous pages

WiFi connection is worse I ever had

Fredrik75 · Sun Feb 09, 2014 2:01 pm

I have several RB7* RB9* routers with this problem.
Get at most about 10Mbit download (about 20MBit with cable).

Tried to reset the settings but still the same issue. Tried different channels, 20MHz, 20MHz/40MHz etc but no change...

I have no problem with a product has some flaws in software that can be corrected, but the lack of interest from MikroTik to solve this issue is very strange...

hedele · Wed Feb 12, 2014 1:10 am

Well I found that for the wireless in 751U and 751G to work reliably, I have to disable RX/TX Chain 1, leaving only chain 0 active.
While that limits me to 65 Mbps @ 20 MHz (Real-Life throughput of around 35-40 Mbps), at least the connection is stable.

Enabling TX chain 1 is usually(!) not a problem as well, but enabling RX chain 1 causes all kinds of mayhem. RX signal strength on the 751 flaps around between -80 and -35 dbm with the laptop being less than 3 meters away, RX speed flaps around between 1 Mbps and > 100 Mbps, latency goes through the roof, real-life speeds of around 4 Mbps maximum.

I have had the exact same behavior on three different units, using several RouterOS versions, so I guess there really is something wrong with the MIMO setup in those devices. If free spectrum is available, go for 40 MHz and RX/TX chain 1 disabled. If not, stay on 20 MHz and disable RX chain 1 only. In case that still produces strange problems, the failsafe setting I found that should always work is 20 MHz, RX/TX chain 1 disabled, hardware-retries set to 15. Even more failsafe - but kind of backwards - use 802.11g only. In fact I actually have to use 802.11g only because my Nintendo devices refuse to associate with 751/951 equipment set to 802.11bgn.

gammy69er · Sun May 18, 2014 3:46 am

Well, I am extremely fresh to this whole subject, but as I work for a small ISP that supplies Hotspot Tech to Managed Apartments and Hotels - I have had a major trial by fire over the last 3 months. In saying that - there are a few things I have found - they may help others with their problems.

1. Mikrotik Routerboard wireless appears to be 95% reliable when running - any reliability issues are due to a failing Routerboard - cases of High Ping may be included in this if your ping is greater than 2s (so a std timeout)

2. Mikrotik Routerboards are NOT setup out of the box - you need to configure EVERYTHING you want to use before it will work. Prime example of this is that under "/interface wireless" if you "set ht-amsdu-limit=" to anything below the default max of 8192 (initial thread I read was 256 - I like results with 2048), you will see a marked improvement of throughput. I was getting 22mbps max initially, that increased to 50 - 60 mbps (Clear LOS). The problem is that I get the same results on a 951 with one chain, and here I am using 2 chains on a 751.

3. the reason that I believe I am getting such poor performance on the Wireless - Signal loss under load - I have my RB 1 room away, in a Dark Spot for testing - I get 5 bars signal (sorry for being sooo technical - haven't figured out wireshark yet :/) - 300mbps report rate. As soon as I put load into the unit - drops to 4 bars and jumps between 54, 81, 108 and 121.5 mbps. Now I know that 54 and 108 and single and dual chain "g", 81, could still be "g", but 121.5 is definitely and "n" rate, and is single chain. I also have a Ubiqity Pico M2 HP to test with, and when I have it in the same position as the RB - I get Full Signal, 1 chain 150mbps report - under load - Full signal, 121.5, 150 mbps report - I get 60/70 throughput.

All testing carried out with Btest to router from an i5 750 @ 4ghz PC with N600 TP-Link Usb Stick

so the Morals of my story...
1. Check your settings - make sure that your datarates haven't been disabled for higher rates if you are getting below 15 mbps to router. if you are getting lower, then Hardreset config and start again. Scripting is a good thing to do here. If this doesn't help - try a replacement unit.
2. if you are getting average wireless throughputs - then try changing the Mac layer stuff - I noticed a significant increase in the speeds of the units - for a smaller SoHo or Home/apartment environment, this will become acceptable to most.
3. in saying all this - the wireless is still ****ed. granted, I am not yet MT certified - but when you put a Radio with supposed "27DBm" output - I would expect much better wireless results than a home grade Belkin, for which I do not see... TP-Links are the way to go for regular home users - but I am looking into Ubiquty/RB combos for our business now as the Ubiquty has, as far as I have seen over the last 6 years or retail and corporate sales, the best wireless out there, hands down. The combo you ask, bescause MT still has the best overall system - Powerful, configurable and inexpensive. DD-wrt - just not for me.

Anywho - My question in this whole bit is does anyone know of a way to improve the WiFi, does the external antenna help that much - and if so, does it only help one chain. I know the RB's with add on WiFi work a treat, but cost a little to much for most of our applications.

either way, Cheers - hope this info helps someone.

*EDIT* So I noticed something after further testing - I had the unit set to Regulatory_domain - New Zealand - and although NZ allows for 30dBm, the unit had been restricted to 17dBm - hence my Low Signals - strangely, after restoring to 27DBm - my signal was much higher, but my throughput dropout was far more severe - Dropping to 5.5mbps sync rate and <3mbps data rate. returning my power to ~19dBm returned my throughput to previously mentioned levels - so if signal is not an issue, dropping your Power may help.

In saying that - I had a look at the antenna array and found it to be a little lack lustre - has anyone ever tried reconnecting their own antennas and seeing if that helps the situation - if so, I would recommend reporting it to Mikrotik - they may consider a future model with no internal array and just external connectors.

ik3umt · Mon Jul 14, 2014 10:43 am

In my 2.4 Ghz radioamateur experience, I found many times the receiver saturation leads to a messy quality reception
Some few hundreds meters links made with yagi antennas with huge latency and retransmissions, gone OK only changing antennas with simple low gain dipole (the homemade radios has no TX power regulation capability) to oppose the too strong signal causing distortions on the receiver frontend.

Working with 18-20dbm and over inside a single room, desn't seem a good idea
Think you have to watch a solar eclipse without filtering sunglasses.......

Just my two cents....

hflack · Thu Jul 24, 2014 3:56 pm

Anyone able to help me with wireless dropouts? Connection will suddenly drop for a moment then reconnect either automatically or require manual connection again.

[admin@MikroTik @ Hayden's] > /interface wireless export compact
# jan/02/1970 10:37:49 by RouterOS 5.26
# software id = ZPD8-PEXA
#
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa-psk,wpa2-psk eap-methods=passthrough management-protection=\
allowed mode=dynamic-keys supplicant-identity=MikroTik wpa-pre-shared-key='' wpa2-pre-shared-key=\
''
add authentication-types=wpa-psk,wpa2-psk eap-methods=passthrough management-protection=allowed mode=dynamic-keys \
name=profile1 supplicant-identity="" wpa-pre-shared-key='' wpa2-pre-shared-key=''
/interface wireless
set 0 band=2ghz-b/g/n channel-width=20/40mhz-ht-above disabled=no distance=indoors frequency=2432 ht-rxchains=0,1 \
ht-txchains=0,1 l2mtu=2290 mode=ap-bridge security-profile=profile1 ssid=MikroTik wireless-protocol=any

scampbell · Sat Oct 18, 2014 1:58 am

These are the settings we use where tablets and Apples are being used.....

1. Use a current RoS
2. Set tx power to 17dBm
3. Use Channel width=20MHz - 20/40MHz is not universally accepted by all devices and uses a lot of spectrum
4. Set distance=indoors
5. Disable TKIP in your security profiles - it limits speed to 54Mbps
6. Set ht-tx-chain=0,1 and ht-rx-chain=0,1 where supported
7. Set Guard Interval=long - allows for slower devices

This has given us stability and happy users.

Handheld devices will look at the signal from an AP and if it is really strong reduce their own power to conserve battery. The result is they may then not have sufficient signal to reach the AP, especially if it's running at 30dBm

It is best to match your AP capability to that of the devices it serves. So a really strong AP signal may not be serving you well if your client device cannot communicate back to it. It is better to have more low power AP's than 1 big one.

Tablets and iPhones disconnect when they go into standby mode - their wireless shuts down when not in use. Expect frequent re-connections from them.

Lastly, if you are running multiple 2.4 GHz AP's at a site stagger them on channel's 1,6 and 11.

And once you are running reliably you can then "tweak" the settings to see what works best for you.

I hope this helps.

sb56637 · Tue Mar 21, 2017 5:57 pm

1. Use a current RoS
2. Set tx power to 17dBm
3. Use Channel width=20MHz - 20/40MHz is not universally accepted by all devices and uses a lot of spectrum
4. Set distance=indoors
5. Disable TKIP in your security profiles - it limits speed to 54Mbps
6. Set ht-tx-chain=0,1 and ht-rx-chain=0,1 where supported
7. Set Guard Interval=long - allows for slower devices
...
I hope this helps.

It sure did help! Sorry for necrobumping this thread, but I just wanted to say that #2 and #4 in scampbell's list were the key to *finally* solving major issues with "disconnected, extensive data loss" errors on my network. (In my case, the devices were laptops with Intel WiFI chipsets, not mobile devices.) I've been fighting with this for weeks, and I've tried everything. Especially when doing large file transfers over the LAN with several connections to the same device, it would consistently disconnect after a few seconds to a few minutes, with "extensive data loss" in the logs. According to NetworkManager on the clients, the disconnects were for "reason -4". So I finally ran across this thread, made changes #2 and #4, and after extensive network stress testing I can say I haven't had a single disconnection. Then I reset the WiFI distance to "dynamic" and power levels to "default", and *boom*, a disconnect with "extensive data loss" within less than a minute. Re-applied #2 and #4, and it runs fast and stable. Another added benefit of this change is that my network throughput is almost twice as fast. So thanks again to scampbell!

There are similar suggestions here too: https://gryzli.info/2015/06/20/mikrotik ... rformance/

scampbell · Sun Sep 10, 2017 10:58 pm

1. Use a current RoS
2. Set tx power to 17dBm
3. Use Channel width=20MHz - 20/40MHz is not universally accepted by all devices and uses a lot of spectrum
4. Set distance=indoors
5. Disable TKIP in your security profiles - it limits speed to 54Mbps
6. Set ht-tx-chain=0,1 and ht-rx-chain=0,1 where supported
7. Set Guard Interval=long - allows for slower devices
...
I hope this helps.
It sure did help! Sorry for necrobumping this thread, but I just wanted to say that #2 and #4 in scampbell's list were the key to *finally* solving major issues with "disconnected, extensive data loss" errors on my network. (In my case, the devices were laptops with Intel WiFI chipsets, not mobile devices.) I've been fighting with this for weeks, and I've tried everything. Especially when doing large file transfers over the LAN with several connections to the same device, it would consistently disconnect after a few seconds to a few minutes, with "extensive data loss" in the logs. According to NetworkManager on the clients, the disconnects were for "reason -4". So I finally ran across this thread, made changes #2 and #4, and after extensive network stress testing I can say I haven't had a single disconnection. Then I reset the WiFI distance to "dynamic" and power levels to "default", and *boom*, a disconnect with "extensive data loss" within less than a minute. Re-applied #2 and #4, and it runs fast and stable. Another added benefit of this change is that my network throughput is almost twice as fast. So thanks again to scampbell!

There are similar suggestions here too: https://gryzli.info/2015/06/20/mikrotik ... rformance/

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