Hi Abu,
By default, NS2 is deterministic. If you would like to run NS2 in
randomized scenarios, you need to execute
$defaultRNG seed n
prior to $ns run, where n is an integer. If n is zero, NS2 will
use the current time and counter as a seed for random number generator.
By default, n is set to 1, meaning every run would generate the
same result. You may manually change the seed (e.g., 2, 3, 4, and so
on), or set it to zero.
I also posted the details on my blog at
http://t-issariyakul.blogspot.com/2009/09/ns2-deterministic-vs-random.html
For more information about Random Number Generators, see Chapter 12 in
the following book from Springer:
T. Issaraiyakul and E. Hossain, Introduction to Network Simulator
NS2, Springer 2008.
http://www.springer.com/engineering/signals/book/978-0-387-71759-3
You may also find the following website useful:
http://www.ece.ubc.ca/~teerawat/NS2.htm
Best Wishes,
Teerawat
On 9/18/2009, abu shahriar azmshahr...@gmail.com wrote:
Hi all,
I am in trouble with randomizing ns run by seeding defaultRNG or ns-random.
Can anyone help me about how to randomize runs? I am using a wired network
topology.
Thanks.
--Shahriar
