Firewall; Packet Filter - BEC 7800 User Manual

Firewall

Packet Filter

Packet filtering enables you to configure your router to block specified internal/external users (IP
address) from Internet access, or you can disable specific service requests (Port number) to / from
the Internet. This configuration program allows you to set up different filter rules for different users
based on their IP addresses or their network Port number. The relationship among all filters is "or"
operation, which means that the router checks these different filter rules one by one, starting from the
first rule. As long as one of the rules is satisfied, the specified action will be taken.
Rule Name: User defined description for entry identification. The maximum name length is 32
characters, and then can choose an application that they want from the listbox.
Source IP address / Source Subnet Mask: This is an Address-Filter used to allow or block traffic
to/from particular IP address(es). Enter the IP & subnet mask you want to filter. If you leave empty or
0.0.0.0, it means any IP address.
Destination IP address / Destination Subnet Mask: This is an Address-Filter used to allow or
block traffic to/from particular IP address(es). Enter the IP & subnet mask you want to filter. If you
leave empty or 0.0.0.0, it means any IP address.
Source Port: This Port or Port Range defines the ports allowed by the Remote/WAN to connect to
the application. Default is set from range 0 ~ 65535. It is recommended that only advance user is
to configure this feature.
Destination Port: This is the Port or Port Range that defines the port of the application.
Protocol: Specify the packet type (TCP, UDP, TCP/UDP) that the rule applies to. Select TCP if you
wish to search for the connection-based application service on the remote server using the port
number. Or select UDP if you want to search for the connectionless application service on the remote
server using the port number.
Direction: Determine whether the rule is for outgoing packets or for incoming packets.
Add: Click this button to add a new packet filter rule and the added rule will appear at the bottom
table.
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