Configure > Networking > DNS Resolver > Resolver
| Local Domain Expansion | Enables or disables local domain expansion so that Content Gateway can attempt to resolve unqualified hostnames by expanding to the local domain. For example, if a client makes a request to an unqualified host named hostx, and if the WCG local domain is y.com, Content Gateway expands the hostname to hostx.y.com. |
| DNS Preference |
Specifies the IP version preference when IPv6 support is enabled in Content Gateway and a web server supports both IPv4 and IPv6. Select IPv4 to cause the proxy to prefer IPv4. Select IPv6 to cause the proxy to prefer IPv6. The DNS Preference is not applied to FTP requests made in transparent proxy mode. The proxy uses the IP address sent with the request. |
| DNS Preference Exceptions | List IPv4 / IPv6 preference rules for specific origin servers. |
| Refresh | Updates the table to display the most up-to-date rules. Click this button after you have added or modified rules with the configuration file editor. |
| Edit File | Opens the configuration file editor. |
| dns_prefer_exception.config File Editor | |
| rule display box |
Displays an ordered list of the dns_prefer_exception.config file rules. Select a rule to edit it. The buttons on the left of the box allow you to delete or move the selected rule up or down in the list. |
| Add | Adds a new rule to the rule display box. Enter information in the fields provided before clicking this button. |
| Set | Updates the selected rule with the values in the entry fields. |
| Name | Specify a unique name to aid in administering rules. |
| Destination Host | Specify the destination hostname. |
| Preferred Format | Specify the preferred IP version, IPv4 or IPv6. |
| Apply | Applies the configuration changes. |
| Close |
Exits the configuration file editor. Click Apply before you click Close; otherwise, all configuration changes are lost. |