Have you ever wished there is a way to share your 5Mbps internet link equally among the 20 users on your network in such a way that a user’s download does not in any way slow down the browsing speed of others? If yes, then this post is what you seek. In this demonstration, I will share with us on how to evenly share bandwidth among connected users, using Mikrotik PCQ.
The Mikrotik PCQ which stands for per connection classifier, is a router OS feature that allows one to dynamically queue connected users by setting a max limit for each user. Using the parameters specified by the administrator during Mikrotik pcq configuration, the router will ensure that each established connection is limited to a predefined connection speed. When properly configured, PCQ ensures that a user using download accelerator or bit torrent does not take up the entire bandwidth while other users struggle.
To setup Mikrotik PCQ to control downloads, we need to define to the router what download packets are. This will be done using the mangle rule. See below.
/ip firewall mangle
add action=mark-connection chain=prerouting src-address=192.168.11.0/24 in interface=ether5 new-connection-mark=office-conn
add action=mark-packet chain=prerouting connection-mark=office-conn new-packet-mark=Lan-packets
The rule above captures packets destined to the LAN address (192.168.11.0/24) as they enter through the WAN interface (ether1). This rule will be used in later step.
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Here, we will create two pcq rules: one for downloads and the other for uploads. See below
add name=Office-down kind=pcq pcq-rate=1M pcq-limit=50KiB pcq-classifier=dst-address pcq-total-limit=2000KiB pcq-burst-rate=0 pcq-burst-threshold=0 pcq-burst-time=10s pcq-src-address-mask=32 pcq-dst-address-mask=32 pcq-src-address6-mask=64 pcq-dst-address6-mask=64
add name=office-up kind=pcq pcq-rate=1M pcq-limit=50KiB pcq-classifier=src-address pcq-total-limit=2000KiB pcq-burst-rate=0 pcq-burst-threshold=0 pcq-burst-time=10s pcq-src-address-mask=32 pcq-dst-address-mask=32 pcq-src-address6-mask=64 pcq-dst-address6-mask=64
From the command above, we can see the queue name are set to “office-up” and “office-down” while the total number of dynamic queues that can be established is set to 50. Since I have just about 2 connected users, I am assuming that established connection at any particular cannot exceed 50. If you have up to 200 users on your network, it will be wise to increase yours to 300 or beyond but bear in mind that the more the queues, the more RAM and processor space it will take from your router. Each user will be limited to 1Mbps upload and download from a total bandwidth from what ever the ISP is giving me. This means that the maximum bandwidth that any connected users can pull is 1Mbps.
Next, I will implement queue tree using the pcq created above as well as the mangle rule created in step one. There are two approaches to this. You can set a max rate for all connected users. That way, the sum of connected users’ bandwidth consumption can not exceed a figure set by you. To do this, first create a queue that will be used as parent queue for subsequent ones. See below:
add name=”download” parent=total-bandwidth packet-mark=office-pack limit-at=0 queue=Office down priority=8 max-limit=0 burst-limit=0 burst-threshold=0 burst-time=0s bucket-size=0.1
add name=”upload” parent=total-bandwidth packet-mark=office-pack limit-at=0 queue=office-up priority=8 max-limit=0 burst-limit=0 burst-threshold=0 burst-time=0s bucket-size=0.1
add name=”total-bandwidth” parent=global packet-mark=office-pack limit-at=3M queue=default-small priority=8 max-limit=3M burst-limit=0 burst-threshold=0 burst-time=0s bucket-size=0.1
If you want connected users to work with what the ISP has available, then there is no need setting the first queue in the image above. Just set rules 2 and 3 making sure that the parent is set to global. That way, each connected user can pull a maximum of 1Mbps from what the ISP is given. At peak period, users may not be able to pull up to 1Mbps. PCQ can help stop users from exceeding a defined bandwidth limit but does not guarantee that users can pull up to a certain speed at all times.
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