Firewall Rule Summary; Figure 93 Security > Firewall > Rule Summary - ZyXEL Communications ZYWALL P1 User Manual

Chapter 9 Firewall
Table 40 SECURITY > FIREWALL > Default Rule (Bridge Mode)
LABEL
Log Broadcast
Frame
Apply
Reset

9.9 Firewall Rule Summary

Click SECURITY > FIREWALL > Rule Summary to open the screen. This screen displays
a list of the configured firewall rules.
The ordering of your rules is very important as rules are applied in the order
that they are listed.
• When the ZyWALL is in bridge mode, enable the default WAN to LAN firewall rule for
the BOOTP_CLIENT service to let DHCP clients behind the ZyWALL use a DHCP
server on the WAN.
• Enable the default WAN to LAN firewall rule for the NetBIOS service to let computers
behind the ZyWALL access devices on the WAN using computer names.
Figure 93 SECURITY > FIREWALL > Rule Summary
154
DESCRIPTION
Select this to create a log for any broadcast frames traveling in the selected
direction. Many of these logs in a short time period could indicate a broadcast storm.
A broadcast storm occurs when a packet triggers multiple responses from all hosts
on a network or when computers attempt to respond to a host that never replies. As
a result, duplicated packets are continuously created and circulated in the network,
thus reducing network performance or even rendering it inoperable. A broadcast
storm can be caused by an attack on the network, an incorrect network topology
(such as a bridge loop) or a malfunctioning network device.
Click Apply to save your changes back to the ZyWALL.
Click Reset to begin configuring this screen afresh.
ZyWALL P1 User's Guide