Operation Manual – DNS
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
DNS Configuration
1-1
Chapter 1 DNS Configuration
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.
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 DNS database for applications.
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:
1) A user program sends a name query to the resolver in the DNS Client.
2) The DNS resolver looks up the local domain name cache for a match. If a match is
found, it sends the corresponding IP address back. If not, it sends the query to the
DNS Server.
3) The DNS Server looks up its DNS database for a match. If no match is found, it
sends a query to a higher DNS Server. This process continues until a result,
success or failure, is returned.
4) The DNS Client performs the next operation according to the result.
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