Attempt to detect TCP and UDP port scans. This match was derived from
Solar Designer's scanlogd.
.TP
.BI "--psd-weight-threshold " "threshold"
Total weight of the latest TCP/UDP packets with different
destination ports coming from the same host to be treated as port
scan sequence.
.TP
.BI "--psd-delay-threshold " "delay"
Delay (in hundredths of second) for the packets with different
destination ports coming from the same host to be treated as
possible port scan subsequence.
.TP
.BI "--psd-lo-ports-weight " "weight"
Weight of the packet with privileged (<=1024) destination port.
.TP
.BI "--psd-hi-ports-weight " "weight"
Weight of the packet with non-priviliged destination port.