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170 Chapter12
Configuring Domain Name Files
Additional Domain Name Configuration Files
Additional Domain Name Configuration Files
In addition to the resolver file and the host name data base, three other
files are available to allow you to configure additional information
about your network. Each of these files is provided in sample format in
the NET.SYS account. Each sample file contains an explanation of the
format for the data and a sample entry. The available files and their
functions are described as follows.
Network Name Database
The network name database, NETWORKS.NET.SYS, associates IP
addresses with official network names and aliases. This allows the user
to refer to a network by a symbolic name instead of an internet address.
To configure the network name database, modify the sample file
NETSAMP.NET.SYS.
Protocol Name Database
The protocol name database PROTOCOL.NET.SYS, associates protocol
numbers with official protocol names and aliases. This allows the user
to refer to a protocol by a symbolic name instead of a number. The
protocol number mappings are defined in RFC 1010 Assigned Numbers.
To configure the protocol name database, modify the sample file
PROTSAMP.NET.SYS (this is required for FTP use, starting in release 6.0).
Service Name Database
The service name database, SERVICES.NET.SYS, associates official
service names and aliases with the port number and protocol the
services use. Reserved port numbers 0 through 255 are assigned by
RFC 1010. To configure the service name database, modify the sample
file SERVSAMP.NET.SYS.