The Icmp Screen - ZyXEL Communications P-793H v3 User Manual

The following table describes the labels in this screen.
Table 78 Advanced > Remote MGMT > DNS
LABEL
Port
Access Status
Secured Client IP
Apply
Cancel

19.7 The ICMP Screen

To change your P-79X'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-79X, an ICMP response packet
is automatically returned. This allows the outside user to know the P-79X exists. Your P-79X
supports anti-probing, which prevents the ICMP response packet from being sent. This keeps
outsiders from discovering your P-79X 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 117 Advanced > Remote MGMT > ICMP
Chapter 19 Remote Management
DESCRIPTION
The DNS service port number is 53 and cannot be changed here.
Select the interface(s) through which a computer may send DNS queries to the P-
79X.
A secured client is a "trusted" computer that is allowed to send DNS queries to
the P-79X.
Select All to allow any computer to send DNS queries to the P-79X.
Choose Selected to just allow the computer with the IP address that you specify
to send DNS queries to the P-79X.
Click this to save your changes.
Click this to restore your previously saved settings.
P-79X Series User's Guide
189