Configuring The Dns Client - 3Com Switch 4800G 24-Port Configuration Manual

DNS Proxy
Configuring the DNS
Client
Configuring Static
Domain Name
Resolution
n
If an alias is configured for a domain name on the DNS server, the device can
resolve the alias into the IP address of the host.
Introduction to DNS proxy
A DNS proxy forwards DNS requests and replies between DNS clients and a DNS
server.
As shown in Figure 290, a DNS client sends a DNS request to the DNS proxy, which
forwards the request to the designated DNS server, and conveys the reply from the
DNS server to the client.
The DNS proxy simplifies network management. When the DNS server address is
changed, you only need to change the configuration on the DNS proxy instead of
on each DNS client.
Figure 290 DNS proxy networking application
DNS client
DNS client
Operation of a DNS proxy
1 A DNS client considers the DNS proxy as the DNS server, and sends a DNS request
to the DNS proxy, that is, the destination address of the request is the IP address of
the DNS proxy.
2 The DNS proxy searches the local static domain name resolution table after
receiving the request. If the requested information exists in the table, the DNS
proxy returns a DNS reply to the client.
3 If the requested information does not exist in the static domain name resolution
table, the DNS proxy sends the request to the designated DNS server for domain
name resolution.
4 After receiving a reply from the DNS server, the DNS proxy forwards the reply to
the DNS client.
Follow these steps to configure static domain name resolution:
To do...
Enter system view
DNS proxy
DNS client
Use the command...
system-view

Configuring the DNS Client

IP network
DNS server
Remarks
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973