Airlink101 AR550W3G - Manual (Page 48)

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IP addresses.
Port
Please input the port number here. 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.
Leaving this field blank indicates all ports.
Enable
Check/uncheck Enable to enable/disable each Packet Filtering
rule.
MAC Level
Please see MAC Control at 3.2.2.3.
Click on Save after you finished all settings.