ZyXEL Vantage CNM User Guide - Page 232

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 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 this to save your changes back to the device. Reset Click this to begin configuring this screen afresh. 232 Vantage CNM User's Guide