Compex Technologies NetPassage 18A - Manual (Page 127)

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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.