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Syntactically, adding a new level introduces another subdivision to the name. In this
example, the machine can belong to the marketing group with the name:
local.market.site
.
Local
is the host name, and
market.site
is the domain name.
Naming Conventions for Domain Names and Host Names
Normally the hierarchical machine names are assigned according to the structure of
organizations that obtain authority for parts of the namespace, not according to the
structure of the physical network interconnections.
A domain name or a host name can be a text string having 2 to 255 characters.
Domain names consist of one or more labels separated by periods. Each label can
contain up to 63 characters. The following characters are allowed in domain names:
v Alphabetical characters A through Z
v Digits 0 through 9
v Underline (_)
Note: The Underline character (_) is not fully supported by all implementations
outside of AS/400.
v Minus sign (-)
v Period (.). Periods are only allowed when they separate labels of domain style
name (refer to RFC 1034,
Domain Names - Concepts and Facilities.
).
Other naming conventions for domain names and host names include the following:
v Uppercase characters and lowercase characters are allowed, but no significance
is attached to the case.
v The first character of each part of the name separated by periods must be an
alphabetic character (uppercase A-Z or lowercase a-z).
v The last character of each part of the name separated by periods must be an
alphabetic character (uppercase A-Z or lowercase a-z) or a numeric character
(0-9).
v Blanks cannot be embedded.
v Only the special characters period (.), minus sign (-), and underline (_) are
allowed.
v Parts of the name separated by periods (.) cannot exceed 63 characters.
v Each part of the name must be at least 1 character.
v Fully-qualified host names including all periods cannot be more than 255
characters.
v Advanced program-to-program communications (APPC), over TCP/IP (part of
AnyNet/400) uses the host name to map location names to Internet addresses.
The host name must be in the form:
location.netid.SNA.IBM.COM
Where
location
is the remote location the program is opening to, and
netid
is the
network identifier for this connection.
SNA.IBM.COM
is the qualifier that
designates this as the APPC over TCP/IP domain.
Location names support characters that cannot be present in host names.
Therefore, the APPC application can open only to locations that fulfill the TCP/IP
host name syntax. This limits location names used for APPC over TCP/IP to the
10 OS/400 TCP/IP Configuration and Reference V4R4