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8.28 Security >> Firewall
Picture 137 - Network firewall Settings
The user can set whether to enable the input through this page, output firewall and set the firewall input and
output rules. Using these Settings can prevent some malicious network access, or restrict internal users
access to some resources of the external network, which can improve security.
Firewall rule set is a simple firewall module. This feature supports two types of rules: input rules and output
rules. Each rule is assigned an ordinal number, allowing up to 10 for each rule.
Considering the complexity of firewall Settings, the following is an example to illustrate:
Table 29 - Network Firewall
Parameter Description
Enable Input Rules Indicates that the input rule application is enabled.
Enable Output Rules Indicates that the output rule application is enabled.
Input/Output To select whether the currently added rule is an input or output rule.
Deny/Permit To select whether the current rule configuration is disabled or allowed;
Protocol There are four types of filtering protocols: TCP | UDP | ICMP | IP.
Src Port Range
Filter port range
Src Address
Source address can be host address, network address, or all addresses
0.0.0.0; It can also be a network address similar to *.*.*.0, such as:
192.168.1.0.
Dst Address
The destination address can be either the specific IP address or the full
address 0.0.0.0; It can also be a network address similar to *.*.*.0, such as:
192.168.1.0.
Src Mask
Is the source address mask. When configured as 255.255.255.255, it means
that the host is specific. When set as 255.255.255.0, it means that a network
segment is filtered.