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Joined: Thu Jan 20, 2022 11:01 pm

Performance regression + IPv6 not working - RB750Gr3

Thu Jan 20, 2022 11:22 pm

Hi everyone,

I am happy user of RB750Gr3 router :) I have recently upgraded to 7.1.1 and saw both performance decrease and IPv6 issues. Then I downgraded back to 6.49.2 and all issues are gone.
RouterOS 7.1.1:
- download: max 210 Mbps, 150 Mbps if I limit CPU frequency to 600 MHz
- IPv6 packets are lost, but router gets prefix from DHCPv6 and propagates it with SLAAC
RouterOS 6.49.2:
- download: max 600 Mbps (limited by ISP)
- IPv6 working just fine

# jan/20/2022 22:13:20 by RouterOS 6.49.2
# software id = 6T18-UE1J
# model = RB750Gr3
# serial number = xxx
/interface bridge
add admin-mac=xxx auto-mac=no comment=defconf name=bridge protocol-mode=none
/interface ethernet
set [ find default-name=ether1 ] arp=disabled
set [ find default-name=ether4 ] disabled=yes
set [ find default-name=ether5 ] disabled=yes
/interface vlan
add arp=disabled interface=ether1 mtu=1492 name=orange vlan-id=35
/interface pppoe-client
add add-default-route=yes disabled=no interface=orange keepalive-timeout=disabled name=pppoe password=xxx use-peer-dns=yes
add add-default-route=yes disabled=no interface=orange keepalive-timeout=disabled name=pppoe-ipv6 password=xxx use-peer-dns=yes
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip pool
add name=dhcp_pool1 ranges=
/ip dhcp-server
add address-pool=dhcp_pool1 disabled=no interface=bridge lease-time=10h name=dhcp1
set 0 name=serial0
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=ether3
add bridge=bridge comment=defconf interface=ether4
add bridge=bridge comment=defconf interface=ether5
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface list member
add comment=defconf interface=bridge list=LAN
add comment=defconf interface=pppoe list=WAN
/ip address
add address= interface=bridge network=
add address= interface=bridge network=
/ip cloud
set ddns-enabled=yes ddns-update-interval=10m
/ip dhcp-server config
set store-leases-disk=never
/ip dhcp-server lease
add address= client-id=xxx mac-address=xxx server=dhcp1
/ip dhcp-server network
add address= dns-server=, gateway=
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" ipsec-policy=out,none out-interface-list=WAN
add action=dst-nat chain=dstnat dst-port=23784 protocol=tcp to-addresses=
/ip service
set telnet disabled=yes
set ftp disabled=yes
set www address=
set ssh port=27364
set api disabled=yes
set winbox disabled=yes
set api-ssl disabled=yes
/ipv6 address
add address=xxx eui-64=yes from-pool=orange interface=bridge
/ipv6 dhcp-client
add add-default-route=yes interface=pppoe-ipv6 pool-name=orange pool-prefix-length=56 request=prefix
/ipv6 nd
set [ find default=yes ] interface=bridge
/system clock
set time-zone-name=Europe/Warsaw
/system scheduler
add disabled=yes interval=10m name=ip on-event=ip policy=read,write,test start-date=oct/01/2021 start-time=21:15:20
/tool bandwidth-server
set enabled=no
/tool mac-server
set allowed-interface-list=none
/tool mac-server mac-winbox
set allowed-interface-list=none
/tool sniffer
set filter-interface=bridge filter-ip-address=xxx/32 streaming-enabled=yes streaming-server=
Posts: 1740
Joined: Tue Jul 19, 2016 6:45 pm
Location: Vancouver, BC, Canada

Re: Performance regression + IPv6 not working - RB750Gr3

Sat Jan 22, 2022 7:45 pm

You don't have any firewall rules - that isn't a secure configuration.

Check system->resources->CPU results when you are doing the speedtest. If a CPU is hitting 100%, use tool profile during the same test to try to determine what process is using the high utilization.

It is also good to compare this between v6 and v7.

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