USG6000 interface overview

USG6000 interface overview

Interface types

An NGFW supports physical and logical interfaces.
1. Physical interface
a. Layer 3 Ethernet interface. Description: Works at the network layer to process Layer 3 packets with an IPv4 or IPv6 address specified and supports routing functions.
b. Layer 2 Ethernet interface. Description: Works at the data link layer and processes Layer 2 packets, implementing rapid Layer 2 forwarding.

2. Logical interface
a. Virtual template (VT) interface. Description: Helps a Point-to-Point Protocol over Ethernet (PPPoE) server with PPP negotiation or encapsulates Layer 2 Tunneling Protocol (L2TP) packets.
b. Dialer interface. Description: Used by a PPPoE client.
c. Tunnel interface. Description: Applies to packet encapsulation and decapsulation and IPv6 transition technologies. GRE and IPSec are common encapsulation protocols.
d. Null interface. Description: Any packets transmitted over this interface are discarded. It is mainly used for route filtering. The null interface cannot be configured through the web UI.
e. VLAN interface. Description: A Layer 3 logical interface that is assigned an IPv4 or IPv6 address. VLAN interfaces transmit packets between VLANs.
f. Layer 3 Ethernet subinterface. Description: Layer 3 Ethernet subinterfaces are Layer 3 logical interfaces created on a physical interface.
f. Layer 2 Ethernet subinterface. Description: Layer 2 Ethernet subinterfaces are Layer 2 logical interfaces created on a physical interface.
h. Eth-Trunk interface (interface aggregation). Description: A logical interface that consists of multiple Layer 2 or Layer 3 Ethernet interfaces. An Eth-Trunk interface provides high bandwidth and reliability.
i. Loopback interface. Description: Remains in the Up state and is assigned a 32-bit subnet mask.

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