ZyXEL Communications P-660HN-F1A, User Manual

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Chapter 18 Remote Management
P-660HN-F1A User’s Guide
286
The following table describes the labels in this screen.
18.7 The ICMP Screen
To change your P-660HN-F1A’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-660HN-F1A,
an ICMP response packet is automatically returned. This allows the outside user to
know the P-660HN-F1A exists. Your P-660HN-F1A supports anti-probing, which
prevents the ICMP response packet from being sent. This keeps outsiders from
discovering your P-660HN-F1A 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 126 Advanced > Remote Management > ICMP
Table 88 Advanced > Remote Management > DNS
LABEL DESCRIPTION
Port The DNS service port number is 53 and cannot be changed here.
Access Status Select the interface(s) through which a computer may send DNS queries
to the P-660HN-F1A.
Secured Client
IP A secured client is a “trusted” computer that is allowed to send DNS
queries to the P-660HN-F1A.
Select All to allow any computer to send DNS queries to the P-660HN-
F1A.
Choose Selected to just allow the computer with the IP address that
you specify to send DNS queries to the P-660HN-F1A.
Apply Click this to save your changes.
Cancel Click this to restore your previously saved settings.