ZyXEL Communications Corporation EMG2881-T20A 사용자 설명서

Chapter 10 Security

EMG2881-T20A User’s Guide

Figure 57   Configuration > Security > IPv4 Firewall 

The following table describes the labels in this screen.

Table 40   Configuration > Security > IPv4 Firewall 

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 EMG2881-T20A 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 EMG2881-T20A 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.

Add Firewall Rule

Service Name

Enter a name that identifies or describes the firewall rule.

MAC Address

Enter the MAC address of the computer for which the firewall rule applies.