Operation Manual - DNSH3C S3100 Series Ethernet Switches Chapter 1 DNS Configuration1-1Chapter 1 DNS ConfigurationNote:This chapter covers only IPv4 DNS configuration. For details about IPv6 DNS, refer toIPv6 Management Operation.1.1 DNS OverviewDomain name system (DNS) is a mechanism used for TCP/IP applications to providedomain name-to-IP address translation. With DNS, you can use memorizable andmeaningful domain names in some applications and let the DNS server resolve it intocorrect IP addresses.There are two types of DNS services, static and dynamic. Each time the DNS serverreceives a name query, it checks its static DNS database before looking up the dynamicDNS database. Reduction of the searching time in the dynamic DNS database wouldincrease efficiency. Some frequently used addresses can be put in the static DNSdatabase.Note:Currently, when acting as a DNS client, an S3100-EI series Ethernet switch supportsboth static and dynamic domain name resolution, while an S3100-SI Ethernet switchsupports only static domain name resolution.1.1.1 Static Domain Name ResolutionThe static domain name resolution means manually setting up mappings betweendomain names and IP addresses. IP addresses of the corresponding domain namescan be found in the static domain name resolution table for applications, such as Telnet.1.1.2 Dynamic Domain Name ResolutionI. Resolution procedureDynamic domain name resolution is implemented by querying the DNS server. Theresolution procedure is as follows:
