D-Link DFL-260-IPS-12 Product Manual - Page 449
Creating Differentiated Limits Using Chains, Using Two Separate Pipes Instead
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10.1.5. Creating Differentiated Limits Using Chains Chapter 10. Traffic Management attempting to flow is 4 Mbps. Since the pipe limit is 2 Mbps, the actual flow will be close to 1 Mbps in each direction. Raising the total pipe limit to 4 Mbps will not solve the problem since the single pipe will not know that 2 Mbps of inbound and 2 Mbps of outbound are the intended limits. The result might be 3 Mbps outbound and 1 Mbps inbound since this also adds up to 4 Mbps. Using Two Separate Pipes Instead The recommended way to control bandwidth in both directions is to use two separate pipes, one for inbound and one for outbound traffic. In the scenario under discussion each pipe would have a 2 Mbps limit to achieve the desired result. The following example goes through the setup for this. Example 10.2. Limiting Bandwidth in Both Directions Create a second pipe for outbound traffic: Command-Line Interface gw-world:/> add Pipe std-out LimitKbpsTotal=2000 Web Interface 1. Go to Traffic Management > Traffic Shaping > Pipes > Add > Pipe 2. Specify a name for the pipe, for example std-out 3. Enter 2000 in Total textbox 4. Click OK After creating a pipe for outbound bandwidth control, add it to the forward pipe chain of the rule created in the previous example: Command-Line Interface gw-world:/> set PipeRule Outbound ForwardChain=std-out Web Interface 1. Go to Traffic Management > Traffic Shaping > Pipe Rules 2. Right-click on the pipe rule you created in the previous example and choose Edit 3. Under the Traffic Shaping tab, select std-out in the Forward Chain list 4. Click OK This results in all outbound connections being limited to 2 Mbps in each direction. 10.1.5. Creating Differentiated Limits Using Chains In the previous examples a static traffic limit for all outbound connections was applied. What if the aim is to limit web surfing more than other traffic? Assume that the total bandwidth limit is 250 kbps and 125 kbps of that is to be allocated to web surfing inbound traffic. The Incorrect Solution Two "surfing" pipes for inbound and outbound traffic could be set up. However, it is not usually required to limit outbound traffic since most web surfing usually consists of short outbound server 449