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

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Intel 1520 manual Configuring the host database, Option Description