v5.6, new parameter "Src Address Mask" in Queue Types

RouterOS General
1

We have a situation where hosts from several different networks are passing through a router for traffic shaping. The networks may be, e.g., 20.0.80.0/24, 20.0.81.0/24, 192.168.1.0/24. We are using pcq’s such that each host gets an equal share of the available bandwidth. With v4.x the system worked well.

After upgrading to v5.6 and with the default values for the new parameters “Src Address Mask” and “Dst Address Mask” in Queue Types left at 32, the traffic was not limited any more. The question then is what is the exact meaning of “Src Address Mask” and “Dst Address Mask” and what values should we set in our case?

2

If we are talking only about IPv4 - the value 32 should be used - it should be 100% compatible with earlier versions (without the parameter).
If the hosts are not limited at all - something different must have happened. You have to inspect it more carefully - in the mangle (if all packets are marked) and in queue tree list (if the packets go into right queues, if there are any PCQ subqueues created for each queue, what is the traffic for each queue, etc.)