Hi,
If you are talking about the time that you need to transmit packet, it is
actually defined by two things 1) packet size and 2) link
characteristics.
There is a detailed explanation of the packets and the scheduling (and
timers) in the book from Springer:
T. Issaraiyakul and E. Hossain, Introduction to Network Simulator
NS2, Springer 2008.
Here is the link:
http://www.springer.com/engineering/signals/book/978-0-387-71759-3
You might also find the following slide useful:
http://www.ece.ubc.ca/~teerawat/NS2.htmhttp://www.ece.ubc.ca/%7Eteerawat/NS2.htm
The following might be useful to you:
You can see the default packet size in the file ns-default.tcl (chapter
3). The packet size is different from one protocol to another. For
example, for TCP,
Agent/TCP set packetSize_ 1000
The second part depends on what link layer you are using. In a wired
network, the link layer delay is defined in a variable link_ of class
SimpleLink (chapter 7). This variable is bound to C++ class LinkDelay.
It schedule two events: 1) the packets leave one place, and 2) the
packet arrive at another place. Class LinkDelay has variables bandwidth_
and delay_ (propagation delay). Based on these two variable as well as
the packet size, you can compute the packet interval.
Hope this would be helpful.
Best,
Teerawat
On 10/27/2008, Mathiew Moussa [EMAIL PROTECTED] wrote:
Hi Jianliang,
Thanks for the prompt reply, i appreciate it.
I was wondering .. ok i'm in the ns-default.tcl file ... but there's
nothing called 'packet interval'. Does have a different name or
terminology, where is it located in the file ?
And what does it exactly 'packet interval' , is it like TTL ?
and about adding it to the MY tcl as an alternative to the above, can
you give me an example or how to add it.
Excuse me but I'm new at NS2 and details are important :)
Thanks Alot.
Mathiew
Quoting J GAO/Jianliang GAO [EMAIL PROTECTED]:
Hi Mathiew,
You can change Packet Interval value in the file ns-default.tcl in
folder ns-2.xx\tcl\lib. However, it is not so convenient to change
the value of interval by modifying ns-default.tcl every time you
test your code in different interval time. There is an alternative
way to change the value of interval. You can change the value in
your own .tcl code in the corresponding part of code of traffic you
use. Obviously, this way facilitates your test.
To find out what exact reason causes the error, using ddd or gdb
to debug and track the code is very helpful.
Regards,
J GAO/Jianliang GAO
2008-10-27
åä»¶äººï¼ Mathiew Moussa
åéæ¶é´ï¼ 2008-10-27 16:34:13
æ¶ä»¶äººï¼ ns-users@ISI.EDU
æéï¼
主é¢ï¼ [ns] What is Packet Interval !!
Hi All ns-users,
Does anyone know what Packet Interval in NS2 is and WHERE can when
change it.
you see im using the SMAC and it was giving me an error Couldn't
Schedule Timer after i ran my TCL script .. I got an answer from one
of the guys that it might possibly have to do with the packet interval.
Thanks in Advance.
Mathiew
