
Customizing NetBIOS over IP
114065 Rev. A 8-3
• Use a server’s NetBIOS name to determine the server’s network address. The
application issues a Name Query Request to NetBIOS, containing the target
server’s NetBIOS name. NetBIOS broadcasts the Name Query Request. The
server that recognizes the name returns a Name Query Response containing
its network address.
The NetBIOS session service allows an application to conduct a reliable,
sequenced exchange of messages with another application. The messages can be
up to 131,071 bytes long.
The NetBIOS datagram service allows an application to exchange datagrams with
a specific application or to broadcast datagrams to a group and receive datagrams
from the group. Datagrams allow applications to communicate without
establishing a session. When a NetBIOS application wants to send information
that does not require acknowledgment from the destination application, the
application can transmit a NetBIOS datagram.
NetBIOS in an IP Environment
The NetBIOS name service and datagram service rely on the capability of the
underlying network to broadcast Name Query Requests to all NetBIOS
applications. In a NetBIOS over IP environment, it is the responsibility of the IP
router to ensure that the broadcast queries reach all appropriate network segments.
To do this, the router
1. Analyzes each NetBIOS packet received on any NetBIOS interface to
determine whether the packet is a broadcast packet
2. Rebroadcasts each broadcast packet out all appropriate interfaces except the
one on which it was received (readdressing the packet if required)
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