D-Link DFL-2500 User Guide - Page 272
Pipe Rules, Setting up Traffic Shaping
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23.3. Pipe Rules 253 23.2.3 Dynamic Bandwidth Balancing As previously stated, per-user bandwidth may be limited by enabling grouping within a pipe. This may be used to ensure that one group cannot consume all of the available bandwidth. But what if the bandwidth for the pipe as a whole has a limit, and that limit is exceeded? Such problem is addressed by a feature in D-Link firewalls called Dynamic Balancing. This algorithm ensures that the bandwidth limit of each group is dynamically lowered (or raised) in order to evenly balance the available bandwidth between the groups of the pipe. The temporary restriction will be removed until the configured limit is satisfied. The dynamic adjustments take place 20 times per second, and will quickly adapt to changed bandwidth distributions. Dynamic balancing functions within each precedence of a pipe individually. This means that if groups are allotted a certain small amount of high priority traffic, and a larger chunk of best-effort traffic, all groups will get their share of the high-precedence traffic as well as their fair share of the best-effort traffic. 23.3 Pipe Rules Pipe Rules are policies that make decisions of what traffic should be passed through which pipes. The pipe rule filters the traffic by service type and interface & network IP addresses, much in the same way as the normal IP rules. Then, the rule chooses appropriate forward and return pipes to the traffics, and determines the precedence(priority) on it. When the firewall receives traffics, it will be able to find these pipe and precedence information in matching rules, and control the utilization of bandwidth according to the limits and/or grouping defined in specific pipes. Remember that only traffic matching a pipe rule will be traffic shaped, and the first matching rule is the one used. 23.4 Scenarios: Setting up Traffic Shaping As seen from the previous sections, in D-Link firewalls, all measuring, limiting, guaranteeing and balancing is carried out in Pipes. However, a pipe by itself is meaningless unless it is put into use in the Pipe Rules D-Link Firewalls User's Guide
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