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Defining Scoped Statements
The concept of scoped statements in a DHCP server configuration file is shown in
Figure 242.
In this example, you see the following:
v Options A, B, and C are global. They are inherited by all clients in the network
unless overridden by a value for the same option at a lower level in the network.
v DHCP options that you define at a global level are overridden by options defined
in a globally defined client for that client only.
v DHCP options that you define at the subnet level override options defined at the
global level for clients falling in that subnet.
v Clients that you have not specifically defined automatically fall into a specific
location in the hierarchy based on their current network location.
v A client that requests a class must fall within a subnet in which the class is
defined, or you must globally define the class, before the client receives options
from the class.
v Options defined for a client override options in a class requested by the client,
provided the class is legal for that client.
v Vendor options are always defined globally so that every client that requests a
vendor is served the same options.
Figure 242. DHCP Hierarchy
410 OS/400 TCP/IP Configuration and Reference V4R4