ZyXEL p-2802h-i1 Manual Do Utilizador

Chapter 19 Remote Management Configuration

P-2802H(W)(L)-I Series User’s Guide

Figure 161   Remote Management: ICMP

The following table describes the labels in this screen. 

Table 111   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. If this option is not selected, 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 rule 

checks before reaching this anti-probing mechanism. Therefore if a firewall rule 

stops a probing packet, the ZyXEL Device reacts based on the firewall rule to 

either 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.