modified on 3 October 2014 at 12:42 ••• 287,293 views

Manual:Queues - PCQ Examples

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Per Connection Queue (PCQ) is a queuing discipline that can be used to dynamically equalize or shape traffic for multiple users, using little administration. It is possible to divide PCQ scenarios into three major groups: equal bandwidth for a number of users, certain bandwidth equal distribution between users, unknown bandwidth equal distribution between users.

Equal Bandwidth for a Number of Users

Use PCQ type queue when you need to equalize the bandwidth [and set max limit] for a number of users. We will set the 64kbps download and 32kbps upload limits.


There are two ways how to make this: using mangle and queue trees, or, using simple queues.

1. Mark all packets with packet-marks upload/download: (lets constider that ether1-LAN is public interface to the Internet and ether2-LAN is local interface where clients are connected

/ip firewall mangle add chain=prerouting action=mark-packet \
   in-interface=ether1-LAN new-packet-mark=client_upload
/ip firewall mangle add chain=prerouting action=mark-packet \
   in-interface=ether2-WAN new-packet-mark=client_download

2. Setup two PCQ queue types - one for download and one for upload. dst-address is classifier for user's download traffic, src-address for upload traffic:

/queue type add name="PCQ_download" kind=pcq pcq-rate=64000 pcq-classifier=dst-address
/queue type add name="PCQ_upload" kind=pcq pcq-rate=32000 pcq-classifier=src-address

3. Finally, two queue rules are required, one for download and one for upload:

/queue tree add parent=global-in queue=PCQ_download packet-mark=client_download
/queue tree add parent=global-out queue=PCQ_upload packet-mark=client_upload

If you don't like using mangle and queue trees, you can skip step 1, do step 2, and step 3 would be to create one simple queue as shown here:

/queue simple add target-addresses= queue=PCQ_upload/PCQ_download


Note: More information about certain and unknown Distribution between routers can be found in PCQ manual.

See Also