NetBIOS Re-broadcast Configuration
Issue 2 July 2005 185
NetBIOS Re-broadcast Configuration
NetBIOS Overview
Short for Network Basic Input Output System, an application programming interface (API) that
augments the DOS BIOS by adding special functions for local-area networks (LANs). Almost all
LANs for PCs are based on the NetBIOS. Some LAN manufacturers have even extended it,
adding additional network capabilities.
You can configure the C360 to relay netbios UDP broadcast packets. This feature is used for
applications such as WINS that use broadcast but may need to communicate with stations on
other subnets or VLANs.
Configuration is performed on a per-interface basis. When a netbios broadcast packet arrives
from an interface on which netbios rebroadcast is enabled, the packet is distributed to all other
interfaces configured to rebroadcast netbios.
If the netbios packet is a net-directed broadcast (e.g., 149.49.255.255), the packet is relayed to
all other interfaces on the list, and the IP destination of the packet is replaced by the appropriate
interface broadcast address.
If the netbios broadcast packet is a limited broadcast (e.g., 255.255.255.255), it is relayed to all
VLANs on which there are netbios-enabled interfaces. In that case, the destination IP address
remains the limited broadcast address.
NetBIOS Re-broadcast Configuration CLI Commands
In order to... Use the following command...
Set NetBIOS rebroadcasts
mode on an interface
ip netbios-rebroadcast
Disable NetBIOS rebroadcasts
mode on an interface
no ip netbios-rebroadcast
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