
Chapter 67 Configuring IP Filter Rules 647
BCM 4.0 Networking Configuration Guide
Firewall rules for BCM with Dialup interfaces
For systems with dialup interfaces (ISDN, V.92), we recommend that you add Filters to all
interfaces except the dialup interface that blocks NetBIOS traffic. This prevents any NetBIOS
packets from getting into the BCM and bringing up the dialup interface link.
For example, if a BCM is configured with two LANs and one ISDN dialout interface, then these
Firewall rules should be placed on both of the LANs.
Table 159 Inbound Rule Configuration for systems with dialup interfaces
IR1
Direction: In
Stateful: Yes
Disposition: Block
Protocol: TCP/UDP
Source IP: 0.0.0.0
Source Mask: 0.0.0.0
Source Port: NETBIOS
Destination IP: 0.0.0.0
Destination Mask: 0.0.0.0
Destination Port: NETBIOS
IR2
Direction: In
Stateful: Yes
Disposition: Block
Protocol: TCP/UDP
Source IP: 0.0.0.0
Source Mask: 0.0.0.0
Source Port: NETBIOS
Destination IP: 0.0.0.0
Destination Mask: 0.0.0.0
Destination Port: DNS
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