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These extensions can be used if `--protocol udp' is specified.  It
provides the following options:
.TP
.BR "--source-port " "[!] \fIport\fP[:\fIport\fP]"
Source port or port range specification.
See the description of the
.B --source-port
option of the TCP extension for details.
.TP
.BR "--destination-port " "[!] \fIport\fP[:\fIport\fP]"
Destination port or port range specification.
See the description of the
.B --destination-port
option of the TCP extension for details.