ZyXEL Prestige 660HW-D1 Wireless Router 91-004-593003B Manual Do Utilizador

P-660H/HW-D Series User’s Guide

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Chapter 15 Remote Management Configuration

Figure 117   Remote Management: ICMP

The following table describes the labels in this screen.

TR-069 is a protocol that defines how your ZyXEL Device can be managed via a management 
server such as ZyXEL’s Vantage CNM Access. 

An administrator can use CNM Access to remotely set up the ZyXEL device, modify settings, 
perform firmware upgrades as well as monitor and diagnose the ZyXEL device. All you have 
to do is enable the device to be managed by CNM Access and specify the CNM Access IP 
address or domain name and username and password.

Table 86   Remote Management: ICMP

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 ZyXEL Device 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 both 

incoming LAN and WAN Ping requests. 

Do not respond to 

requests for 

unauthorized 

services

Select this option to prevent hackers from finding the ZyXEL Device by probing for 

unused ports. If you select this option, the ZyXEL Device will not respond to port 

request(s) for unused ports, thus leaving the unused ports and the ZyXEL Device 

unseen. By default this option is not selected and the ZyXEL Device 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 ZyXEL Device's firewall 

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

mechanism blocks a probing packet, the ZyXEL Device reacts based on the 

corresponding firewall policy to send a TCP reset packet for a blocked TCP packet 

or an ICMP port-unreachable packet for a blocked UDP packets or just drop the 

packets without sending a response packet.

Apply

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

Cancel

Click Cancel to begin configuring this screen afresh.