Cache - ZyXEL Communications Vantage CNM 2.3 User Manual

Centralized network management

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Chapter 7 Device Advanced Settings

7.10 Cache

Use this screen to configure a device's DNS caching. To open this screen, click a

device, click Device Operation and then click Device Configuration >

Advanced > DNS > Cache in the navigation panel.

Figure 98 Device Operation > Device Configuration > Advanced > DNS > Cache

The following table describes the labels in this screen.

Table 91 Device Operation > Device Configuration > Advanced > DNS > Cache

Cache Positive

DNS Resolutions

Cache Negative

DNS Resolutions

Negative Cache

Select the check box to record the positive DNS resolutions in the

cache. Caching positive DNS resolutions helps speed up the device's

processing of commonly queried domain names and reduces the

amount of traffic that the device sends out to the WAN.

Type the maximum time to live (TTL) (60 to 3600 seconds). This sets

how long the device is to allow a positive resolution entry to remain in

the DNS cache before discarding it.

Caching negative DNS resolutions helps speed up the device's

processing of commonly queried domain names (for which DNS

resolution has failed) and reduces the amount of traffic that the

device sends out to the WAN.

Type the time (60 to 3600 seconds) that the device is to allow a

negative resolution entry to remain in the DNS cache before

discarding it.

Click this to save your changes back to the device.

Click this to begin configuring this screen afresh.

Vantage CNM User's Guide