NetComm N300 User Manual page 35

Packet Filters
The Packet Filter enables you to control what packets are allowed to pass through the router. There are two types of packet filter, Outbound
Packet Filter which applies to all outbound packets and the Inbound Packet Filter which only applies to packets that are destined for a Virtual
Server or DMZ host only.
(For further instructions on setting up MAC Level Filtering, please refer to the "MAC Control" section below)
Outbound Filter:
To enable an Outbound Filter, tick the "Enable" tick box at the top of the page.
There are two types of filtering policies:
1. Allow all data traffic to pass except those that match the specified rules.
2. Deny all data traffic to pass except those that match the specified rules.
You can specify up to 48 filtering rules for each direction (Inbound or Outbound). For each rule you will need to define the following:
- Source IP address
- Source port
- Destination IP address
- Destination port
- Protocol: TCP or UDP or both.
- Use Schedule Rule#
For source or destination IP address, you can define a single IP address (192.168.20.1) or a range of IP
addresses (192.168.20.100-192.168.20.200). Leaving these fields empty implies all IP addresses are matched.
For source or destination port, you can also define a single port (80) or a range of ports (1000-1999). Use the prefix "T" or "U" to specify either the
TCP or UDP protocol e.g. T80, U53, U2000-2999. No prefix indicates both
TCP and UDP are defined. Leaving this field empty implies all ports are matched.
The Packet Filter also works with Scheduling Rules, and gives you more flexibility on Access control.
(For further instructions on scheduling rules, please refer to the "Scheduling" section later in this guide)
Click "Save" to save the settings or "Undo" to cancel.
Inbound Filter:
To access the Inbound Packet Filter page, click on the "Inbound Filter" button on the bottom of the Outbound Filter page. All the settings on this
page are the same as those for the Outbound Filter.
Click "Save" to save the settings or "Undo" to cancel.
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