TCP/IP configuration information is stored in the Windows NT Registry. The Registry, illustrated in Figure 31.3, is a hierarchical database that provides a central repository for hardware-specific information.
Figure 31.3 Conceptual View of the Windows NT Registry
In general, the TCP/IP-configuration parameters (such as IP address and computer name) are modified by means of the Windows NT Control Panel or the Administrative Tools (Common) folder. However, parameters that are not routinely changed, such as default Time To Live (TTL) and default Type Of Service (TOS), can be modified only by means of the Registry (with the Registry Editor).
Caution Incorrectly adjusting TCP/IP registry parameters may adversely affect system performance. For a description of these parameters, see the Regentry.hlp help file on the Microsoft Windows NT Resource Kit CD-ROM.