Compex Technologies 18A ユーザーズマニュアル

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Packet Filtering 
With Packet Filtering enabled, the router examines all outgoing packets 
before deciding - according to predefined rules - whether to block 
them or to let them pass.   The setting of rules to control the network 
user access should be done by the system administrators.  
 
This is equivalent to Time-based Access Management and Internet 
Application Filtering features as packet-filtering rules based on these 3 
factors can be defined:  
 
Source IP Address 
Restrict Internet activity originating from a specific PC or group of 
PCs.  
 
 
TCP Port  
Prevent certain applications such as FTP from passing through your 
access point. 
 
 
Time Frame 
Restrict Internet access to certain times.  
For example: You can restrict Internet access from your children’s 
PC to certain time frames, such as between 19H30 and 21H45. 
 
The router thus provides a wide range of options in monitoring the traffic 
in your LAN.  
 
As example, for the rule 
TCP Port 23
 
from any IP on any day at any time  
(Port 23 is usually used by TELNET): 
If 
sent
 is selected, all outgoing packets will be sent, except those 
belonging to TELNET sessions.  
If 
discarded
 is selected, all outgoing packets will be blocked, except for 
those belonging to TELNET sessions.