ZyXEL Communications wireless n gigbit router zyxel manual 184, Add Firewall Rule screen

Chapter 13 Firewall

Table 63 Security > Firewall > Services

LABEL	DESCRIPTION
Do not respond	Select this option to prevent hackers from finding the NBG-460N by
to requests for	probing for unused ports. If you select this option, the NBG-460N will
unauthorized	not respond to port request(s) for unused ports, thus leaving the
services	unused ports and the NBG-460N unseen. By default this option is not
	selected and the NBG-460N 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 NBG-460N's
	firewall mechanism before reaching this anti-probing mechanism.
	Therefore if the firewall mechanism blocks a probing packet, the NBG-
	460N reacts based on the firewall policy, which by default, is to send a
	TCP reset packet for a blocked TCP packet. You can use the command
	"sys firewall tcprst rst [onoff]" to change this policy. When the firewall
	mechanism blocks a UDP packet, it drops the packet without sending a
	response packet.
Firewall Rule
#	This is your firewall rule number. The ordering of your rules is important
	as rules are applied in turn. Use the Move button to rearrange the
	order of the rules.
Active	This icon is green when the rule is turned on. The icon is grey when the
	rule is turned off.
Service Name	This field displays the services and port numbers to which this firewall
	rule applies.
IP	This field displays the IP address(es) the rule applies to.
Schedule	This field displays the days the firewall rule is active.
Log	This field shows you whether a log will be created when packets match
	the rule (Match) or not (No).
Modify	Click the Edit icon to modify an existing rule setting in the fields under
	the Add Firewall Rule screen.
	Click the Remove icon to delete a rule. Note that subsequent firewall
	rules move up by one when you take this action.
Add	Click the Add button to display the screen where you can configure a
	new firewall rule. Modify the number in the textbox to add the rule
	before a specific rule number.
Move	The Move button moves a rule to a different position. In the first text
	box enter the number of the rule you wish to move. In the second text
	box enter the number of the rule you wish to move the first rule to and
	click the Move button.
Misc setting
Bypass Triangle	Select this check box to have the NBG-460N firewall ignore the use of
Route	triangle route topology on the network.
Max NAT/	Type a number ranging from 1 to 16000 to limit the number of NAT/
Firewall Session	firewall sessions that a host can create.
Per User
Apply	Click Apply to save the settings.
Reset	Click Reset to start configuring this screen again.

184

NBG-460N User’s Guide