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1 DNS Configuration
When configuring DNS, go to these sections for information you are interested in:
z DNS Overview
z Configuring Domain Name Resolution
z Displaying and Maintaining DNS
z DNS Configuration Examples
z Troubleshooting DNS
This chapter covers only IPv4 DNS configuration. For details about IPv6 DNS, refer to IPv6
Management Operation.
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.
Currently, S4200G series Ethernet switches support both static and dynamic DNS clients.
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.
Dynamic Domain Name Resolution
Resolution procedure
Dynamic domain name resolution is implemented by querying the DNS server. The
resolution procedure is as follows:
1) A user program sends a name query to the resolver in the DNS client.
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