Block torrent traffic on my Open VPN server (ubuntu)

Job ID: 34461080

Budget: $30 – $250 USD

I am running an Open VPN server (on Ubuntu 18.04) and need to block torrent traffic on it. I don't want my users to be using the VPN service for downloading/seeding torrents. I need someone who can do it maybe by some firewall or some iptable rules.
Related categories: Linux Ubuntu Network Administration OpenVPN Firewall