FastTrack working only in one direction

RouterOS General
1

Hi everyone.

I noticed that FastTrack is working only in one direction.
My setup is using a RB2011, a PPPoE client for getting IP address from my ISP, one masquerade rule for giving Internet access to my LAN and the following firewall rules:

/ip firewall filter

add action=accept chain=input comment="accept established,related,untracked" \
    connection-state=established,related,untracked in-interface-list=WAN
add action=drop chain=input comment="drop invalid" connection-state=invalid \
    in-interface-list=WAN
add action=accept chain=input comment=ICMP in-interface-list=WAN protocol=\
    icmp
add action=drop chain=input comment="drop all other from WAN" \
    in-interface-list=WAN
add action=fasttrack-connection chain=forward comment=FastTrack
add action=accept chain=forward comment="related, established, untracked" \
    connection-state=established,related,untracked

However, I get the following on every connection:

How can I fix this?

2

Note that not all packets in a connection can be FastTracked, so it is likely to see some packets going through slow path even though connection is marked for FastTrack
https://wiki.mikrotik.com/wiki/Manual:IP/Fasttrack

3

Thank you for your reply.
I read about that, but my case is different. It’s not just about some packets, but zero packets on one direction, and for all connections of my network, TCP or UDP.
On the same setup with another RB(hAP ac2) I can see FastTrack working on both directions.