ZyWALL 5 User’s Guide
Appendix M NetBIOS Filter Commands 627
APPENDIX M
NetBIOS Filter Commands
The following describes the NetBIOS packet filter commands. See Appendix K on page 619
for information on the command structure.
Introduction
NetBIOS (Network Basic Input/Output System) are TCP or UDP broadcast packets that
enable a computer to connect to and communicate with a LAN.
For some dial-up services such as PPPoE or PPTP, NetBIOS packets cause unwanted calls.
You can configure NetBIOS filters to do the following:
• Allow or disallow the sending of NetBIOS packets from the LAN to the WAN and from
the WAN to the LAN.
• Allow or disallow the sending of NetBIOS packets from the LAN to the DMZ and from
the DMZ to the LAN.
• Allow or disallow the sending of NetBIOS packets from the WAN to the DMZ and from
the DMZ to the WAN.
• Allow or disallow the sending of NetBIOS packets through VPN connections.
• Allow or disallow NetBIOS packets to initiate calls.
Display NetBIOS Filter Settings
Syntax: sys filter netbios disp
This command gives a read-only list of the current NetBIOS filter modes for The ZyWALL.
NetBIOS Display Filter Settings Command Example
=========== NetBIOS Filter Status ===========
Between LAN and WAN: Block
Between LAN and DMZ: Block
Between WAN and DMZ: Block
IPSec Packets: Forward
Trigger Dial: Disabled
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