ZyXEL Communications Corporation NBG2105 Manuel D’Utilisation
Chapter 14 Firewall
NBG2105 User’s Guide
100
5
For local services that are enabled, protect against misuse. Protect by configuring the services to
communicate only with specific peers, and protect by configuring rules to block packets for the
services at specific interfaces.
communicate only with specific peers, and protect by configuring rules to block packets for the
services at specific interfaces.
6
Keep the NBG2105 in a secured (locked) room.
14.4 Port Filtering Screen
Click Firewall > Port Filtering to apply filtering based on UDP or TCP port numbers.
Figure 62
Firewall > Port Filtering
The following table describes the labels in this screen.
Table 51
Firewall > Port Filtering
LABEL
DESCRIPTION
Enable Port Filtering Click this to apply filtering based on UDP or TCP port numbers.
Port Range
Enter the port number or range of ports that define the traffic type. For example TCP
port 80 defines web traffic.
port 80 defines web traffic.
Protocol
Select TCP to filter on TCP ports, UDP to filter on UDP ports or Both to filter on both
TCP and UDP ports.
TCP and UDP ports.
Comment
Enter a description of this rule.
Apply Changes
Click this to save changes back to the NBG2105.
Reset
Click this to begin configuring this screen afresh.
Current Filter Table
Port Range
This shows the port number or range of ports that define the traffic type. For example
TCP port 80 defines web traffic.
TCP port 80 defines web traffic.
Protocol
This shows TCP for TCP port filtering, UDP for UDP port filtering or Both for TCP and
UDP port filtering.
UDP port filtering.
Comment
Enter a description of this rule.
Select
Click this to select this rule.
Delete Selected
Click this to delete the selected rules.
Delete All
Click this to delete all rules.
Reset
Click this to reset all selections.