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Chapter 21 DNS
ZyWALL 2WG User’s Guide
434
Figure 267 ADVANCED > DNS > Cache
The following table describes the labels in this screen.
Table 140 ADVANCED > DNS > Cache
LABEL DESCRIPTION
DNS 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 ZyWALL’s processing of
commonly queried domain names and reduces the amount of traffic that the
ZyWALL sends out to the WAN.
Maximum TTL 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.
Cache Negative
DNS Resolutions
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.
Negative Cache
Period
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.
Apply Click Apply to save your changes back to the ZyWALL.
Reset Click Reset to begin configuring this screen afresh.
DNS Cache Entry
Flush Click this button to clear the cache manually. After you flush the cache, the
ZyWALL must query the DNS servers again for any domain names that had
been previously resolved.
Refresh Click this button to reload the cache.
# This is the index number of a record.
Cache Type This displays whether the response for the DNS request is positive or negative.
Domain Name This is the domain name of a host.