I forgot the guy’s name who is from FB, who asked me a question, lets name him Mr. X. The query was > howto block downloads of large files (lets say 5mb or above ) in specific timings (like 8pm-12am).
But the issue is How the router will know the file size before it’s downloaded? The router has no way of knowing how big a connection is… An workaround is to create a Firewall Filter rule that will will allow the first 5MB of a connection through, and once it reaches that, it will start to drop packets. I used it a network in Gulistan-e-Jauhar, and it worked good.
But do remember that that It will also affect streaming, RDP like protocols, VPNs, and any other connection that transfers a large number of bytes.
/ip firewall filter
add action=drop chain=forward comment="downloading of files larger then 5mb (It will break connection after 5mb of transfer) applicable from 8pm till 12am / zaib" connection-bytes=5242880-0 disabled=no protocol=tcp time=\
source : https://aacable.wordpress.com/tag/lock-download-based-on-file-size/