Dns Proxy - H3C S7500E Series Operation Manual

Operation Manual – DNS
H3C S7500E Series Ethernet Switches
For example, a user can configure com as the suffix for aabbcc.com. The user only
needs to type aabbcc to get the IP address of aabbcc.com. The resolver can add the
suffix and delimiter before passing the name to the DNS server.
If there is no dot in the domain name (for example, aabbcc), the resolver will
consider this a host name and add a DNS suffix before query. If no match is found
after all the configured suffixes are used respectively, the original domain name
(for example, aabbcc) is used for query.
If there is a dot in the domain name (for example, www.aabbcc), the resolver will
directly use this domain name for query. If the query fails, the resolver adds a DNS
suffix for another query.
If the dot is at the end of the domain name (for example, aabbcc.com.), the
resolver will consider it a fully qualified domain name (FQDN) and return the query
result, successful or failed. Hence, the dot "." at the end of the domain name is
called the terminating symbol.
Currently, the device supports static and dynamic DNS services.
Note:
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.

1.1.3 DNS Proxy

I. Introduction to DNS proxy
A DNS proxy forwards DNS requests and replies between DNS clients and a DNS
server.
As shown in
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 1-2, a DNS client sends a DNS request to the DNS proxy, which
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Chapter 1 DNS Configuration