ZyXEL Communications P-870HW-51A V2 - Figure 57 Incoming IP Filter; Table 33 Incoming IP Filtering; The Incoming IP Filtering Screen

Chapter 9 IP Filter
P-870HW-51a v2 User’s Guide
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The default rule for incoming traffic blocks all incoming connections from the WAN to the
LAN. If you wish to allow certain WAN users to have access to your LAN, you will need to
create custom rules to allow it.
" If you configure filtering rules without a good understanding of how they work,
you might inadvertently introduce security risks to the firewall and to the
protected network. Make sure you test your rules after you configure them.
These custom rules work by comparing the Source IP address, Destination IP address and IP
protocol type of network traffic to rules set by the administrator. Your customized rules take
precedence and override the ZyXEL Device’s default rules.
9.3 The Incoming IP Filtering Screen
Click Security > IP Filter > Incoming to display the following screen. This screen displays a
list of the configured incoming filtering rules.
Figure 57 Incoming IP Filter
The following table describes the labels in this screen.
Table 33 Incoming IP Filtering
LABEL DESCRIPTION
Active Select this check box to enable the rule.
Filter Name This displays the name of the rule.
Interfaces This displays the WAN interface to which this rule is applied.
Protocol This displays the IP protocol that defines the service to which this rule applies.
Source Address /
Mask
This displays the source IP addresses and subnet mask to which this rule applies.
Please note that a blank source address is equivalent to Any.
Source Port This is the source port number.