Domain Name System (Dns); Important Considerations - 3Com corebuilder 3500 Implementation Manual

310 C 11: I
HAPTER NTERNET
Domain Name
System (DNS)
Important
Considerations
P (IP)
ROTOCOL
The Domain Name System (DNS) client allows you to specify a hostname
rather than an IP address when you perform various operations (for
example, when you use
With DNS, you can specify one or more name servers that are associated
with a domain name. Each name server maintains a list of IP addresses
and their associated host names. When you use
a hostname, the DNS client attempts to locate the name on the name
servers that you specify. When the DNS client locates the name, it resolves
it to the associated IP address.
You can resolve an IP address to a host name or a host name to an IP
address on a name server. Enter either the host name or the IP address;
the DNS client displays the pair.
When you set up DNS servers on your LAN, remember the following:
Always set up more than one DNS name server (a primary and
secondary server) so that the lookup service does not have a single
point of failure.
If your ISP changes the Classes of Internetwork Service, change the
DNS settings on each host that the ISP services.
See UNIX NFS documentation for information about how to create and
maintain lists of domain names and IP addresses on the name servers.
For information about how to use
in this guide and the IP chapter in the Command Reference Guide.
or
ping traceRoute
and
ping traceRoute
to contact an IP station).
or
ping traceRoute
, see Chapter 18
with