tl-r478 R488 Router QoS settings

First you have to turn on QoS in the QoS settings and set the overall uplink and downlink bandwidth. 
The second is set in the QoS unit, which is as follows: (content is the QoS rule help information, take a closer look to understand) you need to set the following entry: enable: Rule status. 
IP Address segment: The address range of the internal host, which is invalid when all is empty (or 0.0.0.0). Port segment: The internal host accesses the port range of the external server. 
This field is not valid when all is empty (or 0). 
Protocol: Transport layer Protocol, where all (any match), TCP, and UDP are available, the domain is only valid if the port segment is selected. 
Mode: It can be divided into independent bandwidth and shared bandwidth; The independent bandwidth indicates that the address or port has the upper and lower line bandwidth values, and the shared bandwidth indicates the bandwidth value of the address or port share. 
Uplink bandwidth: The maximum upload speed limit and minimum upload speed are guaranteed through the WAN port, and the maximum bandwidth is 0 when the uplink total bandwidth is used. 
 
Downlink bandwidth: The maximum download speed limit and minimum download speed are guaranteed by the WAN port, and the total downlink bandwidth is used when the maximum bandwidth is 0. The matching order of the rules is to match the IP address + port first, then match the port, and finally match the IP address. The following is an example of a pattern (for simple description, the unit of bandwidth is Mbps): ID address segment Port segment mode uplink bandwidth downlink bandwidth 1 192.168.1.5-192.168.1.7 80-81 share min 1M, max 3M minimum 1M, max 3M 2 192.1 68.1.5-192.168.1.7 80-81 Independent Minimum 1M, max 3M min 1M, max 3M 3 80-81 Independent minimum 1M, max 3M minimum 1M, max 3M 4 192.168.1.5-192.168.1.7 Independent Minimum 1M  , Maximum 3M minimum 1M, maximum 3M 1.  
The rule of this example indicates that the IP address in the LAN is 192.168.1.5 to 192.168.1.7 's computer to access the external service port 80 to 81 o'clock, and their bandwidth sum is the uplink bandwidth minimum 1M, the maximum 3M, downlink bandwidth least 1M, maximum 3M.  
2. The rule of this example indicates that the IP address in the LAN is 192.168.1.5 to 192.168.1.7 's computer to access the external service port 80 to 81 o'clock, their bandwidth is the uplink bandwidth is the smallest 1M, the maximum 3M, downlink bandwidth is least 1M, maximum 3M.  
3. The rule of this example indicates that the bandwidth of the computer accessing the external ports 80 and 81 of the local area network is the minimum uplink bandwidth of 1M, Max 3M, downlink bandwidth is the least 1M, maximum 3M. 4. The rule for this example indicates that the IP address in the LAN is 192.1The bandwidth of the three computers 68.1.5 to 192.168.1.7 is the lowest uplink bandwidth 1M, Max 3M, downlink bandwidth is the least 1M, the largest 3M.