D-Link DWS-4026 Product Manual - Page 321
Loopback Interfaces, Loopbacks Configuration
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Software User Manual 12/10/09 D-Link Unified Access System LOOPBACK INTERFACES D-Link software provides for the creation, deletion, and management of loopback interfaces. They are dynamic interfaces that are created and deleted via user-configuration. D-Link software supports multiple loopback interfaces. A loopback interface is always expected to be up. As such, it provides a means to configure a stable IP address on the device that may be referred to by other switches. This interface provides the source address for sent packets and can receive both local and remote packets. It is typically used by routing protocols. A loopback interface is a pseudo-device for assigning local addresses so that the router can be communicated with by this address, which is always up and can receive traffic from any of the existing active interfaces. Thus, given reachability from a remote client, the address of the loopback can be used to communicate with the router through various services such as telnet and SSH. In this way, the address on a loopback behaves identically to any of the local addresses of the router in terms of the processing of incoming packets. The LAN > L3 Features > Loopbacks folder and LAN > Monitoring > L3 Status folder contain links to the following web pages that configure and display loopback parameters and data: • "Loopbacks Configuration" • "Loopback Summary" LOOPBACKS CONFIGURATION Use the Loopbacks Configuration page to create, configure, or remove loopback interfaces. You can also set up or delete a secondary address for a loopback. To display the page, click LAN > L3 Features > Loopbacks > Configuration in the navigation tree. If no loopback interfaces exist on the system, the page only has two fields, as Figure 225 shows. Figure 225: Loopback Configuration-Create Additional fields display depending on whether or not a loopback has already been created, as shown in Figure 226. Document 34CSFP6XXUWS-SWUM100-D7 Loopback Interfaces Page 321