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Chapter 14 Security
NBG6817 User’s Guide
143
Figure 97 Expert Mode > Security > IPv4 Firewall
The following table describes the labels in this screen.
Table 51 Expert Mode > Security > IPv4 Firewall
LABEL DESCRIPTION
ICMP Internet Control Message Protocol is a message control and error-reporting protocol between
a host server and a gateway to the Internet. ICMP uses Internet Protocol (IP) datagrams, but
the messages are processed by the TCP/IP software and directly apparent to the application
user.
Respond to Ping
on
The NBG6817 will not respond to any incoming Ping requests when Disable is selected. Select
LAN to reply to incoming LAN Ping requests. Select WAN to reply to incoming WAN Ping
requests. Otherwise select LAN&WAN to reply to all incoming LAN and WAN Ping requests.
Firewall Setup
Enable Firewall Select this check box to activate the firewall. The NBG6817 performs access control and
protects against Denial of Service (DoS) attacks when the firewall is activated.
Enable Firewall Rule
Enable Firewall
Rule
Select this check box to activate the firewall rules that you define (see Add Firewall Rule
below).
Filter table type Select DROP to silently discard the packets which meet the firewall rules. The others are
accepted.
Select ACCEPT to allow the passage of the packets which meet the firewall rules. The others
are blocked.
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