NBT Manual

Installation and Configuration
NBT Manual—424773-001
2-4
NBT Domains
When using the NODE^ALIAS command, all workstation references to the Expand
node name should specify the NODE^ALIAS instead of the actual node name. In the
PCT.INI file, these are the HOST_NAME and WINDOW_NAME commands. In
RMPCCOM, this is the SET HOST command. When using Compaq Outside View or
similar 3rd party emulator, specify the NODE^ALIAS node-name in the
HOST_NAME or NODE_NAME field of the MULTILAN configuration screen.
NBT Domains
The NBT ADD DOMAIN command associates a domain with an Internet address and
an associated TCP/IP driver process.
When a domain is active, NBT handles all RFC1001 activity for the given Internet
address.
When local Compaq applications directly or indirectly perform NCB requests such as
ADD NAME, CALL, and LISTEN, NBT communicates with the TCP/IP driver process
using NetBIOS names. In the NetBIOS environment, all names are dynamically bound.
This means that whenever communication is directed to a remote node using a specified
NetBIOS name, the NetBIOS driver (NBT or its remote counterpart) has to resolve the
name into an Internet address. Resolution is done using Internet broadcasts, local lookup
tables, or an RFC1001 NetBIOS name server.
Local Lookup Table for Internet Name Resolution
NBT implements type B, P, and M nodes under RFC1001. Windows 95/98/NT supports
type P and M nodes. Most other TCP/IP implementations support only type B
(broadcast) nodes.
With type B, operation is restricted to a single local network. To allow limited Internet
access, NBT uses a local lookup table mechanism to permit resolution of names on
remote networks. The need to resolve remote names is required only in the processing of
NCB CALL. Some other RFC1001 implementations offer similar features. You can use
these for static windows since the NetBIOS names can be preconfigured, but not for
dynamic windows since the NetBIOS names are, by definition, dynamically generated.
The lookup table is a list of NetBIOS names and associated Internet addresses. You can
use the table in three different modes: BEFORE, AFTER, and ONLY.
In BEFORE mode, the lookup table is searched first. If no match is found in the table,
NBT uses local Internet broadcasts to resolve the name.
In AFTER mode, local broadcast is used first to resolve the name. If local broadcast is
unsuccessful, then the local lookup table is searched.
In ONLY mode, local broadcast is not used; only the lookup table is searched to resolve
the name.