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Introduction to the USG9000
- routing mode In routing mode, the USG9000 uses the layer 3 for external connections, and all interfaces must be assigned with IP addresses. When the USG9000 is located between the internal network and the external network, you need to configure the interfaces, through which the USG9000 is connected with the internal network and the external network, with IP addresses on different network segments and re-plan the network topology. In this case, the USG9000 serves as a router. As shown in Figure 2-1, the USG9000 is connected with the internal network through an interface in the Trust zone, while it is connected with the external network through an interface in the Untrust zone. Note that the interface in Trust zone and the interface in Untrust zone reside in different two subnets.
When working in routing mode, the USG9000 can complete ACL packet filtering. However, network topology needs to be changed. For example, internal network users need to change their gateways and routers' routing configurations need to be changed.
- transparent mode In transparent mode, the USG9000 uses the layer 2 for external connections, and none of the interfaces can be assigned with IP addresses. In this case, the USG9000 is transparent to users in subnets and routers. That is, users do not feel the existence of the USG9000. As shown in Figure 2-2, the USG9000 is connected with the internal network through interfaces in the Trust zone, while it is connected with the external network through interfaces in the Untrust zone. Note that the internal network and the external network must reside in the same subnet.
If the USG9000 works in transparent mode, you do not need to change network topology. In transparent mode, you only need to place the USG9000 in the network like placing a bridge without need of modifying any existing configuration. Similar to the routing mode, IP packets also need to be filtered and checked in transparent mode, and internal users can be protected by the USG9000.
- composite mode If there are both interfaces working in routing mode (such interfaces have IP addresses) and interfaces working in transparent mode (such interfaces have no IP address) in the USG9000, the USG9000 is working in composite mode. Composite mode is applied in the case of dual-system hot backup with transparent mode. The interface on which VRRP is enabled needs to be configured with an IP address, and other interfaces do not. Figure 2-3 shows a typical networking in composite mode.
Master and backup USG9000s are connected with the internal network through interfaces in the Trust zone, while they are connected with the external network through interfaces in the Untrust zone. In addition, master and backup USG9000s connect each other and perform hot standby through VRRP. Note that the internal network and the external network must reside in the same subnet.
Logical Software Architecture
The USG9000 adopts the flexible and sophisticated versatile routing platform (VRP). Based on the component technology, the VRP supports the distributed architecture and improves security features and reliability.
Figure 1 shows the logical diagram of the software architecture.