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Chapter 5
Advanced Configuration
62
ADVANCED FEATURES : DNS Redirection
When you enter a URL in your Internet browser, the browser requests for a name-to-IP
address translation from the Domain Name System (DNS) servers to be able to locate the
web server hosting the website you want to access.
The DNS server, in turn, looks for the answer in its local cache and if an appropriate entry
is found, sends back this cached IP address to the browser. Otherwise, it would have to
contact other DNS servers until the query can be resolved.
When you enable the
DNS Redirection
feature, DNS requests from the LAN clients will be
processed by the router. Unless in the router's
LAN Setup
you have already assigned a
specific DNS server which should always be used, the router would contact the DNS
server allocated by your ISP to resolve DNS requests.
When
DNS Redirection
is enabled, the DNS server used by the router would override the
one defined in the TCP/IP settings of the LAN clients. This allows the router to direct DNS
requests from the LAN to a local or to a closer DNS server it knows of, thus improving
response time.
The
DNS Redirection
feature also provides better control to the network administrator. In
case of a change in DNS servers, the latter can just indicate the IP address of the actual
DNS server in the router's
LAN Setup
and enable
DNS Redirection
, without having to re-
configure the DNS settings of each LAN client.
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