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Destination MAC - this is the MAC address of the Pi. Destination IP and Mask. Enter the Pi's IP and use a mask of 255.255.255.0 (or 255.255.255.255) - this may vary by what the router expects. The Pi must be at a static LAN IP, so it never changes. The MAC and/or IP may be optional, that is, you may have to only enter one of the two. No harm doing both anyway. The IP can also be a range of IP addresses, with a netmask to match. (usually not needed for a single PC) Port range - enter the port, or range of ports. You could specify all ports (1-65,535), it makes no difference if this is the only QoS rule. Now, the confusing part: Source MAC - if this is the Internet, there should be none, so try to leave it blank. Source IP could also be blank, or perhaps 0.0.0.0, netmask 0. This means "any" source. Source port range, can be specific port range for app, or all ports.

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