Zyxel-communications 5 Series Uživatelský manuál stáhnout pdf (Strana 445)

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ZyWALL 5/35/70 Series User’s Guide

Chapter 25 DNS 445

25.7 DNS Cache

DNS cache is the temporary storage area where a router stores responses from DNS servers.

When the ZyWALL receives a positive or negative response for a DNS query, it records the

response in the DNS cache. A positive response means that the ZyWALL received the IP

address for a domain name that it checked with a DNS server within the five second DNS

timeout period. A negative response means that the ZyWALL did not receive a response for a

query it sent to a DNS server within the five second DNS timeout period.

When the ZyWALL receives DNS queries, it compares them against the DNS cache before

querying a DNS server. If the DNS query matches a positive entry, the ZyWALL responses

with the IP address from the entry. If the DNS query matches a negative entry, the ZyWALL

replies that the DNS query failed.

25.8 Configure DNS Cache

To configure your ZyWALL’s DNS caching, click ADVANCED > DNS > Cache. The screen

appears as shown.

Figure 236 ADVANCED > DNS > Cache

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