Operation Manual – DNS
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 DNS Configuration
1-1
Chapter 1 DNS Configuration
When configuring DNS, go to these sections for information you are interested in:
z
z
Configuring Dynamic Domain Name Resolution
z
Displaying and Maintaining DNS
z
z
Troubleshooting DNS Configuration
Note:
This document only covers IPv4 DNS configurations. For introduction to IPv6 DNS
configurations, refer to
IPv6 Configuration
.
1.1 DNS Overview
Domain Name System (DNS) is a distributed database used by TCP/IP applications to
translate domain names into corresponding IP addresses. With DNS, you can use
easy-to-remember domain names in some applications and let the DNS server
translate them into correct IP addresses.
There are two types of DNS services, static and dynamic. After a user specifies a name,
the device checks the local static name resolution table for an IP address. If no IP
address is available, it contacts the DNS server for dynamic name resolution, which
takes more time than static name resolution. Therefore, some frequently queried
name-to-IP address mappings are stored in the local static name resolution table to
improve efficiency.
1.1.1 Static Domain Name Resolution
The static domain name resolution means setting up mappings between domain
names and IP addresses. IP addresses of the corresponding domain names can be
found in the static domain resolution table when you use applications such as telnet.
1.1.2 Dynamic Domain Name Resolution
I. Resolving procedure
Dynamic domain name resolution is implemented by querying the DNS server. The
resolution procedure is as follows:
