8 DNS Configuration by pengxiang


									DNS Configuration
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.: admin@xyz.com.)
                          •   Serial Number – It is the version number that keeps in the SOA
                          •   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 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 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
               •   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.

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