This was taken from Phil's articles on the Wiki.

This is taken from Phil's article on the Wiki:
http://trac.secdev.org/scapy/wiki/LengthFields

Peter had written a very nice tutorial on his web site
http://thesprawl.org/memdump/doku.php?id=tools:scapy
and kindly allowed me to add it to our docs under the
CC BY-NC-SA-2.5 license.

RandDraw*: random draw from a set without replacement.
           Guarantees that a name is not drawn twice
           before all elements have been drawn.
Rand*:     random draw from a set with replacement.
RandSing*: singular values from a set, drawn at random
           with replacement.

ex: ICMP code field

* * *