This  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. 
This is the destination address mask. When configured as 255.255.255.255, 
it  means  the  specific  host.  When  set  as  255.255.255.0,  it  means  that  a 
network segment is filtered. 
 
After setting, click [Add] and a new item will be added in the firewall input rule, as shown in the figure below: 
 
Figure 130 - Firewall input rule table 
Then select and click the [Apply] button. 
In this way, when the device is running, if 192.168.1.118 is the ping, the packet cannot be sent to 
192.168.1.118 because the output rule forbids it. However, the other IP of the ping 192.168.1.0 network 
segment can still normally receive the response packet from the destination host. 
 
Figure 131 - Delete firewall rules 
Select the list you want to delete and click [Delete] to delete the selected list. 
12.28 Device Log >> Device Log 
You can get the device log, and when you encounter an abnormal problem, you can send the log to the 
technician to locate the problem. See 13.6 Get log information.