Strange limit to throughput

RouterOS General
1

Hi!

I have a strange phenomena, which happened with a RB951G-2HnD as well as with a CRS125-24G-1S-2HnD:

The internet line is 150/15 Mbit. Normally, the 150 Mbit download is working. But sometimes the download is around 30-35 Mbit. When I add a slave interface to the Wan Interface and make a download test there, the download is 150 Mbit.

When switching off the router and switching on helps sometimes and 150Mbit download works for some time. But sometimes it helps nothing.

The setup was first done via Quick Set: WISP AP mode with NAT.

Configuration (excerpt):

Router OS Version is 6.28

/ip firewall filter
add chain=input comment=OpenVPN dst-port=1194 protocol=tcp
add chain=input comment="default configuration" protocol=icmp
add chain=input comment="default configuration" connection-state=established,related
add action=drop chain=input comment="default configuration" in-interface=ether1-WAN
add chain=forward comment="default configuration" connection-state=established,related
add action=drop chain=forward comment="default configuration" connection-state=invalid
/ip firewall nat
add action=dst-nat chain=dstnat disabled=yes dst-port=22 in-interface=ether1-WAN protocol=tcp to-addresses=192.168.1.128 to-ports=22
add action=dst-nat chain=dstnat dst-port=65500 in-interface=ether1-WAN protocol=tcp to-addresses=192.168.1.128 to-ports=65500
add action=dst-nat chain=dstnat dst-port=65500 in-interface=ether1-WAN protocol=udp to-addresses=192.168.1.128 to-ports=65500
add action=dst-nat chain=dstnat dst-port=6881 in-interface=ether1-WAN protocol=udp to-addresses=192.168.1.128 to-ports=6881
add action=dst-nat chain=dstnat dst-port=50390 in-interface=ether1-WAN protocol=udp to-addresses=192.168.1.128 to-ports=50390
add action=masquerade chain=srcnat comment="default configuration" out-interface=ether1-WAN to-addresses=0.0.0.0
/ip firewall service-port
set ftp disabled=yes
set tftp disabled=yes
set irc disabled=yes
set h323 disabled=yes
set sip disabled=yes
set pptp disabled=yes

/interface bridge
add mtu=1500 name=bridge-intern protocol-mode=stp
/interface bridge port
add bridge=bridge-intern interface=wlan1
add bridge=bridge-intern interface=ether2-intern

All interfaces are operating in 1Gbit mode.

So why is it limiting the bandwidth?

2

Now some additional info: it does not go more than 35 Mbit anymore.

When connecting through WLan it happened to get full speed. But I can reproduce that.

There must be some setting, which is causing this limitation but I do not know, what could it be or where to look. :confused:

3

The Mikrotik support told me to try following commands and that solved the throughput problem:

/queue type set ethernet-default pfifo-limit=100
/queue interface set [find] queue=ethernet-default