ZyXEL Communications Centralized Network Management Vantage CNM - Manual (Page 199)

Chapter 7 Device Advanced Settings
Vantage CNM User’s Guide
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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.
Apply Click Apply to save your changes back to the device.
Cancel Click Cancel to exit this screen without saving.
Table 87 Device Operation > Device Configuration > Advanced > DNS > Name Server
Record > Add/Edit (continued)
LABEL DESCRIPTION
Table 88 Device Operation > Device Configuration > Advanced > DNS > Cache
LABEL DESCRIPTION
Cache Setup
Cache Positive DNS
Resolutions 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.
Maximum TTL 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.
Cache Negative
DNS Resolutions 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.
Negative Cache
Period 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.
Apply Click Apply to save your changes back to the device.
Reset Click Reset to begin configuring this screen afresh.