ZyXEL Communications ADSL2+4 用户手册

Chapter 15 Remote Management

P-660H-T1v3s User’s Guide

The following table describes the labels in this screen.

To change your P-660H-T1v3s’s security settings, click Advanced > Remote 
MGMT > ICMP. The screen appears as shown.

If an outside user attempts to probe an unsupported port on your P-660H-T1v3s, 
an ICMP response packet is automatically returned. This allows the outside user to 
know the P-660H-T1v3s exists. Your P-660H-T1v3s supports anti-probing, which 
prevents the ICMP response packet from being sent. This keeps outsiders from 
discovering your P-660H-T1v3s when unsupported ports are probed. 

Note: If you want your device to respond to pings and requests for unauthorized 

services, you may also need to configure the firewall anti probing settings to 
match. 

Figure 67   Advanced > Remote Management > ICMP

Table 48   Advanced > Remote Management > DNS

Server Port

The DNS service port number is 53 and cannot be changed here.

Server Access

Select the interface(s) through which a computer may send DNS queries 
to the P-660H-T1v3s.

Secured Client 
IP Address

A secured client is a “trusted” computer that is allowed to send DNS 
queries to the P-660H-T1v3s.

Select All to allow any computer to send DNS queries to the P-660H-
T1v3s.

Choose Selected to just allow the computer with the IP address that 
you specify to send DNS queries to the P-660H-T1v3s.

Apply

Click this to save your changes.

Cancel

Click this to restore your previously saved settings.