User`s guide

Introduction
16
packets arriving from any other source IP address than the one specified are
dropped.
Numeric Protocol Options
If you select Numeric as the protocol when specifying a rule, you need to
specify the desired number.
TCP Protocol Options
If you select TCP as the protocol when specifying a rule, you can define the
following options.
Table 1-4: TCP Protocol Packet Filtering Options
Field/Menu Option Definition
Source Port
- OR -
Destination Port
You can specify a source or destination port number for filtering in
the “Source Port” or “Destination Port” field. You can also specify
a range so that TCP packets are filtered for any port number within
the range.
TCP Flags
Specifying any of the flags: “SYN” (synchronize), “ACK”
(acknowledge), “FIN” (finish), “RST” (reset), “URG” (urgent),
“PSH” (push), and one of the “Any,” “Set,” or “Unset” conditions,
filters TCP packets for the specified flag and the selected
condition.