Configure Dns Cache; Figure 171 Cache; Table 118 Cache - ZyXEL Communications ZyWall 35 User Manual

ZyWALL 35 User's Guide

20.8 Configure DNS Cache

To configure your ZyWALL's DNS caching, click DNS, then the Cache tab. The screen
appears as shown.

Figure 171 Cache

The following table describes the labels in this screen.

Table 118 Cache

LABEL
DNS Cache Setup
Cache Positive DNS
Resolutions
Maximum TTL
Cache Negative
DNS Resolutions
Negative Cache
Period
Apply
344
DESCRIPTION
Select the check box to record the positive DNS resolutions in the cache.
Caching positive DNS resolutions helps speed up the ZyWALL's processing of
commonly queried domain names and reduces the amount of traffic that the
ZyWALL sends out to the WAN.
Type the maximum time to live (TTL) (60 to 3600 seconds). This sets how long
the ZyWALL is to allow a positive resolution entry to remain in the DNS cache
before discarding it.
Caching negative DNS resolutions helps speed up the ZyWALL's processing of
commonly queried domain names (for which DNS resolution has failed) and
reduces the amount of traffic that the ZyWALL sends out to the WAN.
Type the time (60 to 3600 seconds) that the ZyWALL is to allow a negative
resolution entry to remain in the DNS cache before discarding it.
Click Apply to save your changes back to the ZyWALL.
Chapter 20 DNS