This module matches every `n'th packet
.TP
.BI "--every " "value"
Match every `value' packet
.TP
.BI "[" "--counter " "num" "]"
Use internal counter number `num'.  Default is `0'.
.TP
.BI "[" "--start " "num" "]"
Initialize the counter at the number `num' insetad of `0'.  Most between `0'
and `value'-1.
.TP
.BI "[" "--packet " "num" "]"
Match on `num' packet.  Most be between `0' and `value'-1.