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RB 411GL + R52nM - weird slow downs / latency spikes :( Please help!

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bart613
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Joined: Fri Jul 30, 2010 11:04 pm

RB 411GL + R52nM - weird slow downs / latency spikes :( Please help!

Mon Sep 28, 2015 2:05 am

Hi everyone,

I've got a rather weird problem with my 411GL. I use it with R52nM WIFI card to provide WIFI to in my home. It was all nice and dandy for some time, but recently I started having weird slow-downs and even much worse quality during videocalls. I managed to track it down to weird behaviour where every 10-12 seconds, latency jumps sky-high and throughput goes massively down (I mean from ~ 140Mbit/s to 1-2Mbit/s). See below:
Code: Select all
64 bytes from 10.17.17.60: icmp_seq=3196 ttl=64 time=3.777 ms
64 bytes from 10.17.17.60: icmp_seq=3197 ttl=64 time=0.954 ms
64 bytes from 10.17.17.60: icmp_seq=3198 ttl=64 time=1.062 ms
64 bytes from 10.17.17.60: icmp_seq=3199 ttl=64 time=1.936 ms
64 bytes from 10.17.17.60: icmp_seq=3200 ttl=64 time=0.936 ms
64 bytes from 10.17.17.60: icmp_seq=3201 ttl=64 time=1.157 ms
64 bytes from 10.17.17.60: icmp_seq=3202 ttl=64 time=1.904 ms
64 bytes from 10.17.17.60: icmp_seq=3203 ttl=64 time=1.067 ms
64 bytes from 10.17.17.60: icmp_seq=3204 ttl=64 time=1.786 ms
64 bytes from 10.17.17.60: icmp_seq=3205 ttl=64 time=1.219 ms
64 bytes from 10.17.17.60: icmp_seq=3206 ttl=64 time=1.780 ms
vvv LOOK HERE vvv
64 bytes from 10.17.17.60: icmp_seq=3207 ttl=64 time=21.827 ms
64 bytes from 10.17.17.60: icmp_seq=3208 ttl=64 time=108.774 ms
64 bytes from 10.17.17.60: icmp_seq=3209 ttl=64 time=117.936 ms
64 bytes from 10.17.17.60: icmp_seq=3210 ttl=64 time=34.194 ms
64 bytes from 10.17.17.60: icmp_seq=3211 ttl=64 time=1.106 ms
64 bytes from 10.17.17.60: icmp_seq=3212 ttl=64 time=2.092 ms
64 bytes from 10.17.17.60: icmp_seq=3213 ttl=64 time=0.948 ms
64 bytes from 10.17.17.60: icmp_seq=3214 ttl=64 time=1.096 ms
64 bytes from 10.17.17.60: icmp_seq=3215 ttl=64 time=1.013 ms
64 bytes from 10.17.17.60: icmp_seq=3216 ttl=64 time=1.943 ms
64 bytes from 10.17.17.60: icmp_seq=3217 ttl=64 time=1.970 ms
64 bytes from 10.17.17.60: icmp_seq=3218 ttl=64 time=1.179 ms
64 bytes from 10.17.17.60: icmp_seq=3219 ttl=64 time=2.045 ms
64 bytes from 10.17.17.60: icmp_seq=3220 ttl=64 time=2.038 ms
vvv LOOK HERE vvv
64 bytes from 10.17.17.60: icmp_seq=3221 ttl=64 time=145.521 ms
64 bytes from 10.17.17.60: icmp_seq=3222 ttl=64 time=65.319 ms
64 bytes from 10.17.17.60: icmp_seq=3223 ttl=64 time=72.007 ms
64 bytes from 10.17.17.60: icmp_seq=3224 ttl=64 time=1.158 ms
64 bytes from 10.17.17.60: icmp_seq=3225 ttl=64 time=1.153 ms
64 bytes from 10.17.17.60: icmp_seq=3226 ttl=64 time=1.980 ms
64 bytes from 10.17.17.60: icmp_seq=3227 ttl=64 time=1.190 ms
64 bytes from 10.17.17.60: icmp_seq=3228 ttl=64 time=1.225 ms
64 bytes from 10.17.17.60: icmp_seq=3229 ttl=64 time=1.105 ms
64 bytes from 10.17.17.60: icmp_seq=3230 ttl=64 time=1.234 ms
64 bytes from 10.17.17.60: icmp_seq=3231 ttl=64 time=3.302 ms
64 bytes from 10.17.17.60: icmp_seq=3232 ttl=64 time=1.015 ms
64 bytes from 10.17.17.60: icmp_seq=3233 ttl=64 time=1.142 ms
64 bytes from 10.17.17.60: icmp_seq=3234 ttl=64 time=1.096 ms
vvv LOOK HERE vvv
64 bytes from 10.17.17.60: icmp_seq=3235 ttl=64 time=125.727 ms
64 bytes from 10.17.17.60: icmp_seq=3236 ttl=64 time=50.434 ms
64 bytes from 10.17.17.60: icmp_seq=3237 ttl=64 time=60.099 ms
64 bytes from 10.17.17.60: icmp_seq=3238 ttl=64 time=1.222 ms
64 bytes from 10.17.17.60: icmp_seq=3239 ttl=64 time=1.237 ms
64 bytes from 10.17.17.60: icmp_seq=3240 ttl=64 time=1.550 ms
64 bytes from 10.17.17.60: icmp_seq=3241 ttl=64 time=0.989 ms
64 bytes from 10.17.17.60: icmp_seq=3242 ttl=64 time=1.169 ms
64 bytes from 10.17.17.60: icmp_seq=3243 ttl=64 time=1.248 ms
64 bytes from 10.17.17.60: icmp_seq=3244 ttl=64 time=0.975 ms
64 bytes from 10.17.17.60: icmp_seq=3245 ttl=64 time=1.176 ms
64 bytes from 10.17.17.60: icmp_seq=3246 ttl=64 time=1.935 ms
64 bytes from 10.17.17.60: icmp_seq=3247 ttl=64 time=1.870 ms
64 bytes from 10.17.17.60: icmp_seq=3248 ttl=64 time=1.128 ms
vvv LOOK HERE vvv
64 bytes from 10.17.17.60: icmp_seq=3249 ttl=64 time=103.270 ms
64 bytes from 10.17.17.60: icmp_seq=3250 ttl=64 time=26.078 ms
64 bytes from 10.17.17.60: icmp_seq=3251 ttl=64 time=41.164 ms
64 bytes from 10.17.17.60: icmp_seq=3252 ttl=64 time=1.269 ms
64 bytes from 10.17.17.60: icmp_seq=3253 ttl=64 time=1.253 ms
64 bytes from 10.17.17.60: icmp_seq=3254 ttl=64 time=1.266 ms
64 bytes from 10.17.17.60: icmp_seq=3255 ttl=64 time=1.233 ms
10.17.17.60 is the the AP itself.

I tried downgrading firmware - no improvement. I tried upgrading firmware, currently running 6.33rc15. Still the same.

My WIFI configuration is as following:
Code: Select all
[admin@MikroTik] > interface wireless print detail
Flags: X - disabled, R - running
 0  R name="wlan1" mtu=1500 l2mtu=1600 mac-address=D4:CA:6D:14:E9:13 arp=enabled interface-type=Atheros AR92xx mode=ap-bridge
      ssid="MLNG" frequency=5280 band=5ghz-onlyn channel-width=20/40mhz-Ce scan-list=default wireless-protocol=802.11
      vlan-mode=no-tag vlan-id=1 wds-mode=disabled wds-default-bridge=none wds-ignore-ssid=no bridge-mode=disabled
      default-authentication=yes default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0 hide-ssid=no
      security-profile=home-wifi compression=no
With my security-profile as following:
Code: Select all
[admin@MikroTik] > interface wireless security-profiles print detail
Flags: * - default
 0 * name="default" mode=none authentication-types="" unicast-ciphers=aes-ccm group-ciphers=aes-ccm wpa-pre-shared-key=""
     wpa2-pre-shared-key="" supplicant-identity="MikroTik" eap-methods=passthrough tls-mode=no-certificates
     tls-certificate=none mschapv2-username="" mschapv2-password="" static-algo-0=none static-key-0="" static-algo-1=none
     static-key-1="" static-algo-2=none static-key-2="" static-algo-3=none static-key-3="" static-transmit-key=key-0
     static-sta-private-algo=none static-sta-private-key="" radius-mac-authentication=no radius-mac-accounting=no
     radius-eap-accounting=no interim-update=0s radius-mac-format=XX:XX:XX:XX:XX:XX radius-mac-mode=as-username
     radius-mac-caching=disabled group-key-update=5m management-protection=disabled management-protection-key=""

 1   name="home-wifi" mode=dynamic-keys authentication-types=wpa2-psk unicast-ciphers=aes-ccm group-ciphers=aes-ccm
     wpa-pre-shared-key="" wpa2-pre-shared-key="qwerty123" supplicant-identity="" eap-methods="" tls-mode=no-certificates
     tls-certificate=none mschapv2-username="" mschapv2-password="" static-algo-0=none static-key-0="" static-algo-1=none
     static-key-1="" static-algo-2=none static-key-2="" static-algo-3=none static-key-3="" static-transmit-key=key-0
     static-sta-private-algo=none static-sta-private-key="" radius-mac-authentication=no radius-mac-accounting=no
     radius-eap-accounting=no interim-update=0s radius-mac-format=XX:XX:XX:XX:XX:XX radius-mac-mode=as-username
     radius-mac-caching=disabled group-key-update=30m management-protection=disabled management-protection-key=""
I also tried many different frequencies (including auto with radar detection); still the same.

The clients are all Apple devices (iPhone 6, iPads, Macbook Retina 13" 2014 and 2015 models). Also, I'll just add that at work, where we've Cisco Meraki based solution this issue is not happening...

Any advice / ideas / suggestions very much welcomed!
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