Configuring DNS

You can use these pages to configure information about DNS servers the network uses and how the switch/router operates as a DNS client.

Global Configuration

Use this page to configure global DNS settings and to view DNS client status information. To access this page, click System > DNS > Global Configuration.

dns_global_cfg

DNS Global Configuration Fields

Field	Description
Admin Mode	Select Enable or Disable from the pulldown menu to set the administrative status of DNS Client. The default is Disable.
Default Domain Name	Enter the default domain name for DNS client messages. The name should be no longer than 255 characters. When the system is performing a lookup on an unqualified hostname, this field is provided as the domain name. By default, no default domain name is configured in the system.
Retry Number	Enter the number of times to retry sending DNS queries. The valid values are from 0 to 100. The default value is 2.
Response Timeout	Enter the number of seconds to allow a DNS server to respond to a request before issuing a retry. Valid values are 0 to 3600. The default value is 3.
Domain List	Enter a domain list to define the domain to use when performing a lookup on an unqualified hostname. Each name must be no more than 256 characters. Multiple default domain names can be configured using the default domain name list. If there is no domain list, the default domain name configured is used.

If you change any settings, click Submit to send the information to the system.
To create a new list of domain names, click Create. Then enter a name of the list and click Submit. Repeat this step to add multiple domains to the default domain list.
To remove a domain from the default list select the Remove option next to the item you want to remove and click Submit.

Server Configuration

Use this page to configure information about DNS servers that the router will use. The order in which you create them determines their precedence; DNS requests will go to the higher precedence server first. If that server is unavailable or does not respond in the configured response time, then the request goes to the server with the next highest precedence. To access this page, click System > DNS > Server Configuration.

dns_server_cfg

DNS Server Configuration Fields

Field	Description
DNS Server Address	To add a new DNS server to the list, enter the DNS server IPv4 or IPv6 address in numeric notation.
Precedence	Shows the precedence value of the server that determines which server is contacted first; a lower number indicates has higher precedence.

To create a new DNS server, enter an IP address in standard IPv4 or IPv6 dot notation in the DNS Server Address and click Submit. The server appears in the list below. The precedence is set in the order created.
To change precedence, you must remove the server(s) by clicking the Remove box and then Submit, and add the server(s) in the preferred order.

DNS Host Name IP Mapping Summary

Use this page to configure DNS host names for hosts on the network and to view dynamic DNS entries. The host names are associated with IPv4 or IPv6 addresses on the network, which are statically assigned to particular hosts. To access this page, click System > DNS > HostName IP Mapping Summary in the menu.

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DNS Host Name IP Mapping Summary Fields

Field	Description

DNS Static Entries
Host Name	The host name of the static entry.
Inet Address	The IP4 or IPv6 address of the static entry.
Remove	Select to remove a Host Name IP Mapping entry from the Host Name IP Mapping list.
DNS Dynamic Entries
Host Name	The host name of the dynamic entry.
Total	The total time of the dynamic entry
Elapsed	The elapsed time of the dynamic entry.
Type	The type of the dynamic entry.
Addresses	The IP4 or IPv6 address of the dynamic entry.
Remove	Select to remove a Host Name IP Mapping entry from the Host Name IP Mapping list.

The page includes the following command buttons:

Click Add Static Entry to load the Host Name IP Mapping Configuration page in order to configure the Host Name IP Mapping entries.
Click Submit to apply the new configuration and cause the change to take effect immediately. These changes will not be retained across a power cycle unless a Save is performed.
Click Clear Dynamic Entries to remove all Host Name IP Mapping entries. A confirmation prompt will be displayed. Click the button to confirm removal and the Host Name IP Mapping dynamic entries are cleared.
Click Refresh to refresh the page with the most current data from the switch.

If you click Add Static Entry, the DNS Host Name IP Mapping Configuration page appears.

dns_static_host_cfg

DNS Host Name Mapping Configuration Fields

Field	Description
Host Name	Enter the host name to assign to the static entry.
Inet Address	Enter the IP4 or IPv6 address associated with the host name.

The page includes the following command buttons:

Click Submit to apply the new configuration and cause the change to take effect immediately. These changes will not be retained across a power cycle unless a Save is performed.
Click Back to cancel and redisplay the hostname IP mapping page to see the configured hostname‐IP mapping entries.