Typical Application of the Device as a DNS Client

This section describes the application scenario of the FW working as a DNS client.

Application Environment

The FW can use the protocol of DNS to dynamically obtain the IP address of the domain name from the DNS server, which is convenient for user communication.

Typical Application

Figure 1 shows the typical networking in which FW serves as a DNS Client.

Figure 1 Typical networking of the FW serving as a DNS Client

When the FW performs the following services, it can send DNS request packets to the DNS server as a DNS client.

Perform ping or tracert by domain name.
Access to the Security Service Center by domain name to update the signature databases.
Access to the CA server to obtain the certificate online by domain name.