ZyAIR G-2000 Plus User’s Guide

Figure 72 Security

The following table describes the labels in this screen.

Table 56 Security

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 ZyAIR will not respond to any incoming Ping requests when Disable is

on

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 both

 

incoming LAN and WAN Ping requests.

Do not respond to

Select this option to prevent hackers from finding the ZyAIR by probing for unused

requests for

ports. If you select this option, the ZyAIR will not respond to port request(s) for

unauthorized

unused ports, thus leaving the unused ports and the ZyAIR unseen. By default this

services

option is not selected and the ZyAIR will reply with an ICMP Port Unreachable

 

packet for a port probe on its unused UDP ports, and a TCP Reset packet for a port

 

probe on its unused TCP ports.

 

Note that the probing packets must first traverse the ZyAIR's firewall mechanism

 

before reaching this anti-probing mechanism. Therefore if the firewall mechanism

 

blocks a probing packet, the ZyAIR reacts based on the firewall policy, which by

 

default, is to send a TCP reset packet for a blocked TCP packet. You can use the

 

command "sys firewall tcprst rst [onoff]" to change this policy. When the firewall

 

mechanism blocks a UDP packet, it drops the packet without sending a response

 

packet.

Apply

Click Apply to save your customized settings and exit this screen.

 

 

Reset

Click Reset to begin configuring this screen afresh.

 

 

167

Chapter 12 Remote Management Screens