LevelOne WGR-6012 - Manual (Page 41)

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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:
(1.2.3.100-1.2.3.149) Remote hosts are allow to send mail (port 25), and browse the Internet (port 80)
(1.2.3.10-1.2.3.20) Remote hosts can do everything (block nothing)
Others are all blocked.
Example 2: