ZyXEL Communications NBG6617 User Manual page 131

Figure 85 Expert Mode > Security > IPv4 Firewall
The following table describes the labels in this screen.
Table 54 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 The NBG6617 will not respond to any incoming Ping requests when Disable is selected.
on 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 NBG6617 performs access control and
protects against Denial of Service (DoS) attacks when the firewall is activated.
Enable Firewall Rule
Enable Firewall Select this check box to activate the firewall rules that you define (see Add Firewall Rule
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.
Add Firewall Rule
Chapter 14 Security
NBG6617 User's Guide
131