Wuxi MitraStar Technology Co. Ltd DSL100HNUT1V3 User Manual

Chapter 14    Firewall

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The following table describes the labels in this screen.

Table 61   Security > Firewall > Rules 

Firewall Rules 

Storage Space in Use

This read-only bar shows how much of the Device's memory for recording firewall 

rules it is currently using. When you are using 80% or less of the storage space, the 

bar is green. When the amount of space used is over 80%, the bar is red.

Packet Direction

Use the drop-down list box to select a direction of travel of packets for which you 

want to configure firewall rules.

Create a new rule 

after rule number 

Select an index number and click Add to add a new firewall rule after the selected 

index number. For example, if you select “6”, your new rule becomes number 7 and 

the previous rule 7 (if there is one) becomes rule 8.

The following read-only fields summarize the rules you have created that apply to 

traffic traveling in the selected packet direction. The firewall rules that you configure 

(summarized below) take priority over the general firewall action settings in the 

General screen.

#

This is your firewall rule number. The ordering of your rules is important as rules are 

applied in turn. 

Active

This field displays whether a firewall is turned on or not. Select the check box to 

enable the rule. Clear the check box to disable the rule.

Source IP Address

This column displays the source addresses or ranges of addresses to which this 

firewall rule applies. Please note that a blank source or destination address is 

equivalent to Any.

Destination IP 

Address

This column displays the destination addresses or ranges of addresses to which this 

firewall rule applies. Please note that a blank source or destination address is 

equivalent to Any.

Service 

This column displays the services to which this firewall rule applies. 

Action

This field displays whether the firewall silently discards packets (Drop), discards 

packets and sends a TCP reset packet or an ICMP destination-unreachable message 

to the sender (Reject) or allows the passage of packets (Permit).

Source Interface

This column displays the source interface to which this firewall rule applies. This is 

the interface through which the traffic entered the Device. Please note that a blank 

source interface is equivalent to Any.

Destination Interface

This column displays the destination interface to which this firewall rule applies. This 

is the interface through which the traffic is destined to leave the Device. Please note 

that a blank source interface is equivalent to Any.

Modify

Click the Edit icon to go to the screen where you can edit the rule.
Click the Remove icon to delete an existing firewall rule. A window displays asking 

you to confirm that you want to delete the firewall rule. Note that subsequent 

firewall rules move up by one when you take this action.