Configuring The Ipv4 Dns Client; Configuring Static Domain Name Resolution - HP 10500 Series Configuration Manual

The DNS client comprises the resolver and cache. The user program and DNS client can run on the same
device or different devices, but the DNS server and the DNS client usually run on different devices.
Dynamic domain name resolution allows the DNS client to store the latest mappings between domain
names and IP addresses in the dynamic domain name cache. The DNS client does not need to send a
request to the DNS server for a repeated query next time. The aged mappings are removed from the
cache after some time, and latest entries are required from the DNS server. The DNS server decides how
long a mapping is valid, and the DNS client gets the aging information from DNS messages.
DNS suffixes
The DNS client holds a list of user-defined suffixes. The resolver can use the list to supply the missing part
of incomplete names.
For example, a user can configure com as the suffix for aabbcc.com. The user only needs to type aabbcc
to obtain the IP address of aabbcc.com because the resolver adds 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 considers this a host
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name and adds a DNS suffix before the query. If no match is found after all configured suffixes are
used, the original domain name (for example, aabbcc) is used for the query.
If there is a dot (.) in the domain name (for example, www.aabbcc), the resolver directly uses this
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domain name for the 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 considers
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it a Fully Qualified Domain Name (FQDN) and returns the query result, successful or failed. The dot
at the end of the domain name is considered a terminating symbol.
The device supports static and dynamic DNS client services.
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.

Configuring the IPv4 DNS client

Configuring static domain name resolution

Configuring static domain name resolution refers to specifying the mappings between host names and
IPv4 addresses. Static domain name resolution allows applications such as Telnet to contact hosts by
using host names instead of IPv4 addresses.
Follow these guidelines when you configure static domain name resolution:
The IPv4 address you last assign to the host name overwrites the previous one if there is any.
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• You may create up to 50 static mappings between domain names and IPv4 addresses.
To configure static domain name resolution:
Step
1. Enter system view.
2. Configure a mapping between a
host name and an IPv4 address.
Command
system-view
ip host hostname ip-address
85
Remarks
N/A
Not configured by default.