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 60   Security > Firewall > Default Action 

Packet Direction

This is the direction of travel of packets (WAN to LAN, LAN to WAN, WAN to Router, 

LAN to Router).
Firewall rules are grouped based on the direction of travel of packets to which they apply. 

For example, LAN to Router means packets traveling from a computer/subnet on the 

LAN to the Device itself. 

Default Action

Use the drop-down list boxes to select the default action that the firewall is to take on 

packets that are traveling in the selected direction and do not match any of the firewall 

rules. 
Select Drop to silently discard the packets without sending a TCP reset packet or an ICMP 

destination-unreachable message to the sender.
Select Reject to deny the packets and send a TCP reset packet (for a TCP packet) or an 

ICMP destination-unreachable message (for a UDP packet) to the sender.
Select Permit to allow the passage of the packets.

Apply

Click this to save your changes.

Cancel

Click this to restore your previously saved settings.

Click Security > Firewall > Rules to display the following screen. This screen displays a list of the 

configured firewall rules. Note the order in which the rules are listed.



The ordering of your rules is very important as rules are applied in turn.

Figure 101 Security > Firewall > Rules