ZyXEL Communications vantage cnm ユーザーズマニュアル

Chapter 6 Device Security Settings

Vantage CNM User’s Guide

Click Device Operation in the menu bar and then click Device Configuration > Security > 
Firewall > Anti-Probing in the navigation panel to open the following screen. Configure this 
screen to help keep the device hidden from probing attempts. You can specify which of the 
device’s interfaces will respond to Ping requests and whether or not the device is to respond to 
probing for unused ports.

Figure 53   Device Operation > Device Configuration > Security > Firewall > Anti-Probing

Action for 
Matched Packets

Use the drop-down list box to select what the firewall is to do with packets that 
match this rule. 
Select Drop to silently discard the packets without sending a TCP reset packet or 
an ICMP destination-unreachable message to the sender.
Select Reject to deny the packets and send a TCP reset packet (for a TCP packet) 
or an ICMP destination-unreachable message (for a UDP packet) to the sender.
Select Permit to allow the passage of the packets. 

Note: You also need to configure NAT port forwarding (or full 

featured NAT address mapping rules) if you want to allow 
computers on the WAN to access devices on the LAN.

Note: You may also need to configure the remote management 

settings if you want to allow a WAN computer to manage the 
device or restrict management from the LAN.

Apply

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

Cancel

Click Cancel to exit this screen without saving.

Table 42   Device Operation > Device Configuration > Security > Firewall > Rule Summary > 

Add/Edit (continued)