LevelOne WBR-6012 - Manual (Page 46)

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For source or destination IP address, you can define a single IP address (4.3.2.1) or a range of
IP addresses (4.3.2.1-4.3.2.254). An empty implies all IP addresses.
For source or destination port, you can define a single port (80) or a range of ports
(1000-1999). Add prefix "T" or "U" to specify TCP or UDP protocol. For example, T80, U53,
U2000-2999. No prefix indicates both TCP and UDP are defined. An empty implies all port
addresses. Packet Filter can work with Scheduling Rules, and give user more flexibility on
Access control. For Detail, please refer to Scheduling Rule.
Each rule can be enabled or disabled individually.
Inbound Filter:
To enable Inbound Packet Filter click the check box next to Enable in the Inbound Packet
Filter field.
Suppose you have SMTP Server (25), POP Server (110), Web Server (80), FTP Server (21),
and News Server (119) defined in Virtual Server or DMZ Host.
Example 1: