D-Link DFL-210-WCF-12 Product Manual - Page 90
Interfaces, 3.3.1. Overview, Source and Destination Interfaces, Interface Types
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3.3. Interfaces Chapter 3. Fundamentals 3.3. Interfaces 3.3.1. Overview An Interface is an important logical building block in NetDefendOS. All network traffic that transits through, originates from or is terminated in the NetDefend Firewall, does so through one or more interfaces. Source and Destination Interfaces An interface can be viewed as a doorway through which network traffic passes to or from NetDefendOS. A NetDefendOS interface has one of two functions: • The Source Interface When traffic arrives through an interface, that interface is referred to in NetDefendOS as the source interface (also sometimes known as the receiving or incoming interface). • The Destination Interface When traffic leaves after being checked against NetDefendOS's security policies, the interface used to send the traffic is referred to in NetDefendOS as the destination interface (also sometimes known as the sending interface). All traffic passing through NetDefendOS has both a source and destination interface. As explained in more depth later, the special logical interface core is used when NetDefendOS itself is the source or destination for traffic. Interface Types NetDefendOS supports a number of interface types, which can be divided into the following four major groups: • Ethernet Interfaces Each Ethernet interface represents a physical Ethernet port on a NetDefendOS-based product. All network traffic that originates from or enters a NetDefend Firewall will pass through one of the physical interfaces. NetDefendOS currently supports Ethernet as the only physical interface type. For more information about Ethernet interfaces, see Section 3.3.2, "Ethernet Interfaces". • Sub-interfaces Some interfaces require a binding to an underlying physical interface in order to transfer data. This group of interfaces is called Physical Sub-Interfaces. NetDefendOS has support for two types of sub-interfaces: • Virtual LAN (VLAN) interfaces as specified by IEEE 802.1Q. When routing IP packets over a Virtual LAN interface, they will be encapsulated in VLAN-tagged Ethernet frames. For more information about Virtual LAN interfaces, please see Section 3.3.3, "VLAN". • PPPoE (PPP-over-Ethernet) interfaces for connections to PPPoE servers. More information about this topic can be found in Section 3.3.4, "PPPoE". • Tunnel Interfaces 90