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Configuring the host database
The appliance host database stores the domain name server (DNS) entries of servers that the appliance contacts to fulfill user requests. You configure the appliance host database by setting options in the Host Database Management section. The following table describes the options.
Option | Description |
|
|
Lookup timeout | Specifies the DNS lookup timeout in seconds. You can |
| choose from the following: |
| ❚ 5 seconds |
| ❚ 10 seconds |
| ❚ 15 seconds |
| ❚ 20 seconds |
| ❚ 30 seconds |
|
|
Foreground | Specifies how long DNS entries can remain in the database |
timeout | before they are flagged as stale. You can choose from the |
| following: |
| ❚ 12 hours |
| ❚ 24 hours |
| ❚ 48 hours |
| For example, if this timeout is 24 hours, and a user requests |
| an entry that has been in the database for 24 hours or longer, |
| the appliance will refresh the entry before serving it. |
| You can set the background timeout (see next item) to refresh |
| entries in the background, before objects become stale. |
| Be careful not to set the foreground timeout too low. Doing so |
| might slow response time. Additionally, setting the timeout |
| value too high risks accumulation of incorrect information. |
| Setting the foreground timeout to greater than or equal to the |
| background timeout disables background refresh. |
|
|
Chapter 4 Configuring the Appliance | 45 |