Operation Manual - DNS
H3C S3100 Series Ethernet Switches Chapter 1 DNS Configuration
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Chapter 1 DNS Configuration
 Note:
This chapter covers only IPv4 DNS configuration. For details about IPv6 DNS, refer to
IPv6 Management Operation.
1.1 DNS Overview
Domain name system (DNS) is a mechanism used for TCP/IP applications to provide
domain name-to-IP address translation. With DNS, you can use memorizable and
meaningful domain names in some applications and let the DNS server resolve it into
correct IP addresses.
There are two types of DNS services, static and dynamic. Each time the DNS server
receives a name query, it checks its static DNS database before looking up the dynamic
DNS database. Reduction of the searching time in the dynamic DNS database would
increase efficiency. Some frequently used addresses can be put in the static DNS
database.
 Note:
Currently, when acting as a DNS client, an S3100-EI series Ethernet switch supports
both static and dynamic domain name resolution, while an S3100-SI Ethernet switch
supports only static domain name resolution.
1.1.1 Static Domain Name Resolution
The static domain name resolution means manually setting up mappings between
domain names and IP addresses. IP addresses of the corresponding domain names
can be found in the static domain name resolution table for applications, such as Telnet.
1.1.2 Dynamic Domain Name Resolution
I. Resolution procedure
Dynamic domain name resolution is implemented by querying the DNS server. The
resolution procedure is as follows:
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