The network may have been designed in advance and the configuration specified in advance. It should be possible to pre-configure the configuration servers prior to other hardware installation. This should not preclude later updates or later configuration at specific devices.
The DHCP servers have a database that is manually maintained defining the relationship between machine parameters and IP parameters. This defines:
Hardware MAC addresses that are to be allocated specific fixed IP information.
Client machine names that are to be allocated specific fixed IP information.
Hardware MAC addresses and address ranges that are to be allocated dynamically assigned IP addresses and IP information.
Client machine name patterns that are to be allocated dynamically assigned IP addresses and IP information.
The IP information that is provided will be a specific IP address together with other information. The present recommendation is to provide all of the following information when available.
The manual configuration of DHCP is often assisted by automated user interface tools that are outside the scope of DICOM. Some people utilize the DHCP database as a documentation tool for documenting the assignment of IP addresses that are preset on equipment. This does not interfere with DHCP operation and can make a gradual transition from equipment presets to DHCP assignments easier. It also helps avoid accidental re-use of IP addresses that are already manually assigned. However, DHCP does not verify that these entries are in fact correct.