Community discussions

MikroTik App
 
Gints
just joined
Topic Author
Posts: 8
Joined: Wed Aug 11, 2004 9:33 am

RB751U-2HnD wireless very, very slow

Fri Feb 10, 2012 1:39 pm

Hi there,
Recently bought this RB751U-2HnD router, s/n 2B66012A9C97/142 and it is very very slow with wireless connection. Configuration is default from factory. It was upgraded to latest 5.12 software and 2.38 firmware. It does not matter if wpa2 is used or not, if it is g or n standart. On a 8Mbps line it goes only 1-2 Mbps (speedtest.net) Our older routers Netgear WGR614 and Dlink DIR-615 does not have any problems to get all 8Mbps. Is this is some hardware bug and I need to ask replace my router or there is something special what we can do with configuration? Thanks.
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 26322
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia

Re: RB751U-2HnD wireless very, very slow

Fri Feb 10, 2012 1:42 pm

1. make sure your WPA uses AES and not TKIP encryption
2. post output from v5.12 "/export compact" command.
 
Gints
just joined
Topic Author
Posts: 8
Joined: Wed Aug 11, 2004 9:33 am

Re: RB751U-2HnD wireless very, very slow

Fri Feb 10, 2012 2:18 pm

1. it did not help
[admin@MikroTik] > export compact
# jan/02/1970 00:02:20 by RouterOS 5.12
# software id = TG1C-02P7
#
/interface bridge
add admin-mac=00:0C:42:F7:C4:21 auto-mac=no l2mtu=1598 name=bridge-local \
    protocol-mode=rstp
/interface wireless
set 0 band=2ghz-b/g/n channel-width=20/40mhz-ht-above disabled=no frequency=\
    2422 ht-rxchains=0,1 ht-supported-mcs="mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,m\
    cs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15" \
    ht-txchains=0,1 l2mtu=2290 mode=ap-bridge ssid=MT wireless-protocol=any \
    wmm-support=enabled
/interface ethernet
set 0 name=ether1-gateway
set 1 name=ether2-master-local
set 2 master-port=ether2-master-local name=ether3-slave-local
set 3 master-port=ether2-master-local name=ether4-slave-local
set 4 master-port=ether2-master-local name=ether5-slave-local
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk mode=dynamic-keys \
    wpa2-pre-shared-key=3405771418
/ip pool
add name=default-dhcp ranges=192.168.88.10-192.168.88.254
/ip dhcp-server
add address-pool=default-dhcp disabled=no interface=bridge-local name=default
/interface bridge port
add bridge=bridge-local interface=ether2-master-local
add bridge=bridge-local interface=wlan1
/ip address
add address=192.168.88.1/24 comment="default configuration" interface=\
    bridge-local
/ip dhcp-client
add comment="default configuration" disabled=no interface=ether1-gat
/ip dhcp-server network
add address=192.168.88.0/24 comment="default configuration" dns-serv
    192.168.88.1 gateway=192.168.88.1
/ip dns
set allow-remote-requests=yes servers=194.168.4.100,194.168.8.100
/ip firewall filter
add chain=input comment="default configuration" protocol=icmp
add chain=input comment="default configuration" connection-state=est
add chain=input comment="default configuration" connection-state=rel
add action=drop chain=input comment="default configuration" in-inter
    ether1-gateway
/ip firewall nat
add action=masquerade chain=srcnat comment="default configuration" \
    out-interface=ether1-gateway
/ip smb shares
set [ find default=yes ] directory=/pub
/system clock
set time-zone-name=Europe/London
/tool bandwidth-server
set allocate-udp-ports-from=1000 authenticate=no max-sessions=1
[admin@MikroTik] > 
 
uldis
MikroTik Support
MikroTik Support
Posts: 3446
Joined: Mon May 31, 2004 2:55 pm

Re: RB751U-2HnD wireless very, very slow

Fri Feb 10, 2012 2:39 pm

please make support output file when the wireless is slow and send that to support@mikrotik.com
 
Gints
just joined
Topic Author
Posts: 8
Joined: Wed Aug 11, 2004 9:33 am

Re: RB751U-2HnD wireless very, very slow

Fri Feb 10, 2012 2:56 pm

done
 
Gints
just joined
Topic Author
Posts: 8
Joined: Wed Aug 11, 2004 9:33 am

Re: RB751U-2HnD wireless very, very slow

Fri Feb 10, 2012 4:31 pm

so far good news, changing wireless settings for a card to power-mode=card-rates and tx-power=17 helped, maybe channel width must be 20Mhz as well. Thanks, Uldis.
 
mtmx80
Frequent Visitor
Frequent Visitor
Posts: 87
Joined: Wed Mar 16, 2011 11:12 pm

Re: RB751U-2HnD wireless very, very slow

Fri Feb 10, 2012 6:09 pm

Thy my configuration if you are using it indoors like SOHO wireless and you would like to use 802.11n :
/interface wireless
set 0 adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=3 antenna-mode=ant-a 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=RealCountry 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=2452 frequency-mode=regulatory-domain frequency-offset=0 hide-ssid=no \
    ht-ampdu-priorities=0 ht-amsdu-limit=256 ht-amsdu-threshold=256 ht-basic-mcs=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=cts-to-self hw-protection-threshold=2347 hw-retries=4 l2mtu=2290 mac-address=00:0C:42:F7:B6:E1 max-station-count=7 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=short proprietary-extensions=post-2.9.25 radio-name=000C42F7B6E1 \
    rate-selection=advanced rate-set=default scan-list=default security-profile=WPA2 ssid=MySID 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=10s \
    wds-cost-range=50-150 wds-default-bridge=none wds-default-cost=100 wds-ignore-ssid=no wds-mode=disabled wireless-protocol=802.11 wmm-support=disabled
/interface wireless manual-tx-power-table
set wlan1 manual-tx-powers="1Mbps:5,2Mbps:10,5.5Mbps:10,11Mbps:10,6Mbps:17,9Mbps:10,12Mbps:10,18Mbps:10,24Mbps:10,36Mbps:10,48Mbps:10,54Mbps:10,HT20-0:17,HT20-1:17,HT20-2:17,HT20-3:17\
    ,HT20-4:17,HT20-5:17,HT20-6:17,HT20-7:17,HT40-0:10,HT40-1:10,HT40-2:10,HT40-3:10,HT40-4:26,HT40-5:25,HT40-6:24,HT40-7:20"
/interface wireless nstreme
set wlan1 disable-csma=no enable-nstreme=yes enable-polling=yes framer-limit=3200 framer-policy=best-fit
/interface wireless align
This configuration will works fine only if you are <10m indoors, and there is no much noise around you. I can reach 80+Mbps real throughput with this. If distance is high between router and wireless client power-mode=card-rates and tx-power=17 should help so don't modify them.

For some reason following settings improve throughput:
enable-nstreme=yes enable-polling=yes
# I don't know why nStream should be enabled, but it was performed better with it than without it.
hw-protection-mode=cts-to-self hw-protection-threshold=2347 hw-retries=4

and most important was: ht-amsdu-limit=256 ht-amsdu-threshold=256.
# Decreacing AMSDU from 8192 increases throughput! I read oposit of this on many posts, but try it and you will see.
so far good news, changing wireless settings for a card to power-mode=card-rates and tx-power=17 helped, maybe channel width must be 20Mhz as well. Thanks, Uldis.
 
Gints
just joined
Topic Author
Posts: 8
Joined: Wed Aug 11, 2004 9:33 am

Re: RB751U-2HnD wireless very, very slow

Sat Feb 11, 2012 6:06 pm

Changing amsdu did not make any noticable effect, enabling nstreme ended with loosing wireless connection complete. I better will not experiment too much with things what I not yet understand. Yes, I use it indoors, two floor house, users are three computers and couple mobile phones, distance maybe not more than 10 metres, but through a few walls. On my computer I see about 15 other access points somewhere else. Welcome to city environment.
I think that for a SOHO router a default configuration must be better optimized, that is a suggestion for Mikrotik.
 
cdiggity
newbie
Posts: 31
Joined: Fri Oct 31, 2008 12:40 pm

Re: RB751U-2HnD wireless very, very slow

Fri Jun 20, 2014 11:27 pm

changing Tx-power mode to card rates and Tx power was at default of 17 allowed my lenovo t430s to connect at 130 mbps and my speed test went from 3 megabit/s to 25mbit/s which is the limit of my internet connection.

Also before i only had tkip enabled, so i also checked off aes ccm, and i also changed advanced-distance to indoors, but changing the tx power was the last thing I did and it made the difference. maybe the other settings are necessary too. with mikrotik you never know what magic incantation of settings are required.

this is with version 5.26.

Who is online

Users browsing this forum: davidalain and 32 guests