D-Link DVG-1402S manual Advanced Firewall, Pass or Block, Source, Destination

Advanced > Firewall

This Router comes equipped with a firewall. The Firewall configuration screen allows the Router to enforce specific predefined policies intended to protect against certain common types of attacks. To configure the Router’s firewall, click the Advanced tab at the top of the screen and then the Firewall tab to the left.

Pass or Block	Select the action you want the filter to take when it finds a
	packet that meets the criteria entered below.
Protocol	The protocol associated with this IP filter. The user may choose
	between TCP, UDP or Both.
Source	Enter the IP address or range of IP addresses that you wish to
	block or allow to pass through the router. The Source may be
	identified on the LAN side, the WAN side or both by using the
	pull-down menu for the Interface heading.
Destination	Enter the IP address or range of IP addresses that you wish to
	deny or allow access to the Internet. The Destination may be
	identified on the LAN side, the WAN side or Both by using the
	pull-down menu for the Interface heading. The type of protocol
	may also be chosen by using the pull-down menu. The user
	may choose between TCP, UDP, ICMP or (*) Any. The user
	may also select a range of ports of the destination IP addresses
	by entering the range under the Port Range heading.
Subnet Mask	The subnet mask that corresponds to the IP address above.
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