Introduction to DHCP functions on the AR.

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The Dynamic Host Configuration Protocol (DHCP) dynamically configures and uniformly manages network parameters of hosts on a TCP/IP network. DHCP provides the following functions:
Dynamic allocation: DHCP allocates an IP address with a limited validity period (lease) to a client.
This mechanism applies to hosts that temporarily connect to a network with fewer IP addresses than the total number of hosts. For example, this mechanism can be used to allocate IP addresses to laptops used by employees on business trips or mobile terminals in cafes.
Static allocation: Fixed IP addresses are assigned to specified hosts.
This mechanism applies to hosts with special IP address requirements. For example, the file server of an enterprise needs to use a fixed IP address to provide services for external users.
Compared with manual IP address configuration, DHCP static allocation prevents manual configuration errors and helps network administrators perform unified maintenance and management.
DHCP can allocate other network parameters to hosts, including the DNS server address, routing information, and gateway address.

Other related questions:
Configure the basic firewall functions on an AR router
The basic firewall functions of an AR router include: creating a security zone and adding interfaces into the security zone, creating an interzone and enabling the firewall functions in the interzone, configuring session table aging time, and checking the configuration result. For details about the configuration, see the following content: [Creating a security zone and adding interfaces into the security zone on an AR router] Create a security zone and add interfaces into the security zone on an AR router. [Enabling the firewall functions on an AR router] Enable the firewall functions on an AR router. [Configuring session table aging time of the firewall on an AR router] Configure session table aging time of the firewall on an AR router. For details about configuration of basic firewall functions on AR series routers, see the URL: AR router configuration firewall basic functions.

How to classify the interfaces of AR routers
For AR routers: Interfaces of a device are used to exchange data and interwork with other devices and can be classified into physical interfaces and logical interfaces, in which: 1. Physical interfaces are real interfaces supported by components and can be further classified into management interfaces and service interfaces. - Management interfaces: Management interfaces are used to support the configuration and management operations performed by users. Users can use management interfaces to log in to devices and perform configuration and management operations. Management interfaces do not transfer service data. - Service interfaces: Service interfaces are used to transfer service data and can be classified into LAN interfaces and WAN interfaces. LAN interfaces can be used by routers to exchange data with network devices in the LAN. WAN interfaces can be used by routers to exchange data with devices in the external networks which are far away from the routers. 2. Logical interfaces can implement data exchange but do not exist physically and must be established by configurations. Logical interfaces transfer service data.

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