DNS Configuration Overview A domain name is a unique name that identifies a server on the Internet. A domain name typically consists of two or more parts usually separated by dots. In the example of, www.xincom.com, the given root name of “xincom” denotes the second level domain. Second level domain names are registered by a consumer/business through a Top Level Domain (TLD) registry such as Internic.com. The suffix behind the root name, .com in this example, is a Top Level Domain in the Domain Name System. This denotes the highest level of the hierarchy after the root name of “xincom”. Both the second and top level domains create the unique domain name xincom.com. Every Web, FTP or Email server requires an Authoritative Domain Name Server to route the domain name to the respective IP address or multiple IP addresses. Using the DPG602 as an authoritative DNS gives the network administrator the ability to easily create and manage extra domain names. This gives a web site expanded bandwidth and redundancy via auto-failover in case a single Internet connection fails. The DNS Configuration is a major part of the XC-DPG603. By acting as an authoritative name server, it is able to serve the incoming requests on UDP port 53 (DNS port) and provide the IP address of the web server. The DPG603 manipulates the last step based on a few factors, such as current bandwidth, load balance type and load share percentage (Advanced Port => Load Balance menu). When a request comes in to your domain name, the XC-DPG603 looks at these factors to determine which WAN port should be used to access the server. When the traffic load is higher on WAN 1, the XC-DPG603 will reply with the IP address of WAN2, in which case the user will connect to WAN 2 allowing for the best latency and speed. The XiNCOM XC-DPG603 is capable of handling up to 10 domain names in such manner, giving you the ability to provide hosting services with automatic fail-over and load balancing (Check your Internet Service Provider service agreement before hosting any content on your connections). Configure DNS You must have two WAN connections with static IP addresses in order to use the Load Balance and Fail-over functionality provided by the DPG603 DNS to IP function. Only one broadband connection is required for the Authoritative DNS function. It is necessary to register your WAN1/WAN2 IP addresses with your Domain Name Provider for a static DNS. NOTE: Once you have configured the DNS configuration, you may configure your connection validation and load balance options in the Advanced Port menu in Load Balancing and Port Options. Figure 8-1: DNS Configuration DNS Configuration Setup DNS Server You can select DNS1 or DNS2 or both to setup your domain name server for inbound load balance SOA (Start Of Authority) • Domain Name – It is the name that you register on DNS Record organization. You have to fill-out the Fully Qualified Domain Name (FQDN) with an ending char (a dot) for this text field.(ex : xyz.com.). When you enter the following domain name, you can only input different chars without an ending dot, then its name is added with domain name, it becomes FQDN. • Primary Name Server – It is the primary server name that you give to name this server. (e.g.: pns1, its FQDN is pns1.xyz.com.) • Admin. Mail Box – It is the administrator mail address name.(e.g.: email@example.com.) • Serial Number – It is the version number that keeps in the SOA record. • Refresh Interval – It is the time interval before the zone should be refreshed. Default value is 10 hours. • Retry Interval – It is the time interval that should elapse before a failed refresh should be retried. Default value is 10 minutes. • Expiration Limit – It is the time interval that specifies the upper limit that can elapse before the zone is no longer authoritative. Default value is 24 hour. • Minimum TTL – The minimum time to live (TTL). It is the minimum time of any record that is exported from this zone. Default value is 3 minutes. NS (Name Server) Record • Pri. Name Server – It is primary name server like above. • Public WAN1 IP Address – Default 0.0.0.0 is your WAN1 port IP address for primary name server. You can fill other real IP address other than WAN1 port IP. • Sec. Name Server – It is secondary name server. • Public WAN2 IP Address – Default 0.0.0.0 is your WAN2 port IP address for secondary name server. You can fill other real IP address other than WAN2 port IP. MX (Mail Exchange) • Mail Exchange – It is the mail server name. If you enter “mail” Record for this field, then its FQDN is mail.xyz.com. • Preference – The priority order of a mail server. If you have more two mail servers. • Location – It is the mail server location. Either in Public IP location, or in Private IP location. • IP Address – It is the mail server IP address. Map Host URL Other than set up DNS configuration, It is necessary for users to select an URL to map to the IP address of a local host. It is the URL to be mapped. Its FQDN is the combination of URL and domain name. Figure 8-2: Map Host URL Map Host URL A Record • Host URL List – A list of URLs you map the IP address of to a local host. • DNS Server List – List of DNS servers you can select. • Host URL – It is the URL to be mapped. • Private IP – It is the IP address of local host. • Port Range – The port range of all incoming packets are accepted and processed by a local host with the specified private IP address • Public WAN1/2 IP address – It is IP address, if your ISP can support multiple static IP addresses for any WAN port, otherwise you leave it to blank by default, it will use your current IP address of WAN1 or WAN2 port for incoming load balance. CNAME Record • Canonical Name – It is the alias host URL.