User's Guide

Chapter 14 Security
EMG3435-Q20A User’s Guide
142
Fig ure 97 Expert Mode > Security > IPv4 Firewall
The following table describes the labels in this screen.
Table 51 Expert Mode > Security > IPv4 Firewall
LABEL DESCRIPTIO N
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 EMG3435-Q20A will not respond to any incoming Ping requests when Disa b le 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 EMG3435-Q20A 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 DRO P to silently discard the packets which meet the firewall rules. The others are
accepted.
Select AC C EPT to allow the passage of the packets which meet the firewall rules. The others
are blocked.