D-Link DFL-2500 User Guide - Page 270
Table 23.1: IPv4 Packet Format
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23.2. Pipes 251 separate bandwidth limits may be specified for each of the 4 precedences with a unit of "kilobits per second". Traffic that exceeds the limit of a higher precedence will automatically be transferred into the "Low" level for best effort delivery, as long as there is room in this precedence. 1 byte 1 byte Version IP Header Length Type-of-Service Identification Time-to-Live Protocol Source Address Destination Address Options(padding) Data 2 bytes Total Length Flags Fragment Offset Header Checksum Table 23.1: IPv4 Packet Format In addition to the limit per precedence, a limit for the pipe as a whole may also be specified. When the bandwidth utilization through the pipe reaches the total limit, traffic will be prioritized depending on what precedence it belongs to. Higher precedences have a greater chance of making it through the pipe without queuing. Note 1. Set a total limit In order to know how much to limit lower-precedence traffic, the pipe needs to know the overall capability. 2. Limits cannot be higher than the available connection bandwidth If the pipe limits are set higher than the actual available bandwidth, the pipe will never know that the connection is full, and hence be unable to throttle the lower-precedence traffic. 3. Bandwidth cannot be guaranteed if available bandwidth is not known at all times D-Link Firewalls User's Guide
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