Greetings.
I'm a noob trying to use nistnet for testing purposes and I have a few
questions. I did install the program (on a Linux 2.6 kernel) and I can
invoke it.
However, I have a few questions on the options. I've read thru the FAQ on
the NIST website and did a cnistnet --help command to see if I could find
the answers but I haven't (or am still not sure). I'd like to ask the
questions here, if it's appropriate.
Q1) What does the [cos] option refer to?
This is what is on the nistnet usage page. The cnistnet --help output shows
something similar:
-a src[:port[.protocol]] dest[:port[.prot]] [cos]
^^^^^^^^
Q2) The delay is in milliseconds. So to delay packets by 1 second, the
delay option should be "--delay 1000" right?
I'm confused by the floating point. Would the option "-delay 1000.50" mean
that the packets would be delayed by 1.0005 secs?
Q3) The drop/dup probabilities are defined, according to the FAQ guide, as
"(i.e. 100xfraction)". So am I correct to assume that the right value for
the --drop option for a 10% loss is "--drop 10.00" (.10 X 100 = 10.00) ??
Q4) I understand the drdmin and drdmax. But I'm not sure about the
drdcongest option. This is shown on the FAQ and --help option:
"[--drd drdmin drdmax [drdcongest]]"
What does the drdcongest value do?
Q5) Variable packet delays.
I want a delay that starts off at 1 sec and then increases by a second until
it has a max delay of 5 sec. How would I do that? The distribution is
simple but I'm lost trying to use distributions for the options.
Q6) Intervals
Is there a way to use intervals with nistnet? I want to drop 1% of all
packets every 10-20 seconds. The interval is not fixed. It is between
10-20 seconds. The drop is 1% so within a 60 sec interval, the drop rate
would be between 3 and 6 seconds. I could use a distribution that increases
the drop rate starting at 3 and increasing it til 6% inclusive. But for my
test, it has to be an interval of every 10-20 seconds.
Some of these questions might be obvious but I am a newbie and I just
installed this tool.
Thanx in advance,
John
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