Configuring DNS for Huawei Firewall

This chapter will tell how to configure DNS for Huawei Symantec.

The Domain Name System (DNS) establishes the mapping between domain names and IP addresses for easy memorization.

A Domain Name System (DNS) is a host naming mechanism in character string format of TCP/ IP to establish the mapping between domain names and IP addresses. It is a mechanism of mapping easy-to-remember and meaningful domain names to IP addresses recognizable for network devices.

DNS delivers the following functions:

1 Device Serving can be as a DNS Client

2 Device Serving can be as a DNS Proxy

3 Device Serving can be as a DDNS Client

USG2100/2200/5100 BSR/HSR & USG2000/5000 (such as USG2220, USG5310)Configuration Guide: Configuring the DNS for Huawei Symantec

Adding a DNS Server

The DNS server accepts the domain name resolution requests initiated by the DNS client. You can statically set an IP address for the DNS server connected to the device through this task. The IP address of the DNS server is generally provided by the ISP. In addition, it can also be automatically obtained, which requires the connection type of at least one interface to be configured as DHCP or PPPoE.

The priority of the DNS server whose IP address is statically configured is higher than the one whose IP address is dynamically obtained. For the DNS servers whose IP addresses are configured in the same way, the one that has an IP address (either obtaining automatically or configured statically) earlier enjoys a higher priority. When resolving domain names, the device sends query packets (according to the priorities) to DNS servers until the query succeeds.

Step 1 Choose Network > DNS > DNS.

Step 2 Enter the IP address of the DNS server in the DNS Server List text box.

Step 3 Click Add.

If the operation succeeds, the new configuration whose Obtaining Mode is Static is displayed in DNS Server List.

Repeat the previous operations to add the IP addresses of multiple DNS servers.

NOTE

l If the obtaining mode of an entry in DNS Server List is DHCP, the IP address of the DNS server is obtained dynamically through DHCP.

l If the obtaining mode of an entry in DNS Server List is PPPoE, the IP address of the DNS server is obtained dynamically through PPPoE.

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Deleting a DNS Server

You can deete only the DNS server IP addresses that are obtained statically, but not those obtained through DHCP/PPPoE. If the interface that is connected through DHCP or PPPoE is physically Down, or the interface fails to be connected through DHCP or PPPoE, the corresponding DNS server IP address is deleted automatically from the DNS server list.

Step 1 Choose Network > DNS > DNS.

Step 2 Select the check boxes of multiple entries or the check box in the table header for selecting all.

Step 3 Click Delete.

If the operation succeeds, the entries that are just selected are not displayed in DNS Server List.

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