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[ns] [ns] handoff simulations in mobileip
hi ns users..
iam using rh 6.2 with intelp 133 mhz
iam going to make a handoff method in mobile ip simulation
for my final project in telecommunication engineering.
i take study on telecommunication engineering. i am on my
study for my final project for enginieur/bachelor in
telecommunication engg. my theme is 'an analysis of seamless
handoff method in case of mobile ip in the internet cellular
environment'.
iam hoping to using ns for my project, but iam having
trouble in installing ns and first howto running a
simple.tcl example.
ihope u alldont mind to answer this 'stupid' question
thankyou anyway
nickymuhammadali
telecommunicatuion engineering
stttelkom
bandung
indonesia
On Tue, 21 Aug 2001 16:17:11 -0700 (PDT)
Debojyoti Dutta <[email protected]> wrote:
> Hi Huan
>
> We are in the process of adding features to ns that can
> address the issues
> that you raised.
>
> Proceeding from where John left: Suppose you had a very
> large network with
> lots of traffic sources and sinks. You want to run the
> simulations for
> 4000 seconds. One reason why you may want to run that
> long would be to
> find the steady state and find out whether that scenario
> is interesting
> for you. That could be done using analytical techniques
> and would be much
> faster as the speed of simulations is of the order of the
> number of
> packets generated (or events).
>
> We are working on an architecture that will (within NS)
> do a quick
> but approximate analytical simulator that will give you
> the status of the
> network in an user friendly fashion. This work is nto
> available for
> release as yet.
>
> If you have any further questions, please let me know. I
> will try to
> answer them ....
>
> Regards
> Debo
>
> -----------------------------------------------------------
>
>
>
> Hi NS users,
>
> I have searched through NS mailing-list archieve and have
> found a similar question posted a year ago, but I failed
> to
> find an answer for that question. So I re-post this
> question
> again, hopefully someone can give me a hint.
>
> http://www.isi.edu/nsnam/archive/ns-users/webarch/2000/msg03604.html
>
> http://www.isi.edu/nsnam/archive/ns-users/webarch/2000/msg03609.html
>
> As I understand, because NS implements a packet-level
> simulation, the time it takes to run the simulation, and
> the
> computer power required is proportional to the number of
> packets generated. If I want to simulate a big network
> (many
> links with large capacity), does it pose a scalability
> problem for NS ?
>
> Let consider the actual example:
>
> I have just implemented a small simulation to simulate
> WEB,
> Audio, and FTP traffic going between Workstation and Node
> n0, The topology is as following:
>
>
> # a Lan consists of 20 workstations
> # a 10Mbits Switch
> # a 10Mbits link to outside
> #
> #
> # n2
> # \ |
> # \ |
> # ... -- n1(Switch) --------- n0
> # / |
> # / |
> # n21
> #
>
> If the link utilisation for n1-n0 is 50%, i.e. throughput
> =
> 5Mbits equivalent to 500 packets /second (each packet of
> about 1Kbytes ~ 10 Kbits). If I run the simulation for
> 100
> seconds, since each packet travel through 2 links, NS has
> to
> handle a total of 2 * 500 * 100 = 10^5 packets .
>
> The actual time it takes to run on my machine (Pentium
> III,
> 700MHz, 256M RAM), is 2 minutes
>
> Now if I want to have a network of 50 routers fully
> meshed,
> with links of 10Mbits , and link utilisation = 50% , and
> run
> it for 4000 seconds.
>
> Total number of links ~ 50 ^ 2 = 2500
> Total number of packets generated = 500 * 2500 * 4000 = 5
> *
> 10^9 (packets).
> Expected time to run the simulations = 2(min.) * 5 *
> 10^9
> / (10^5) = 10^5 minutes = 600 (days)
>
> In other words, it is just imposible to run a simulations
> that generate many traffic. Does anyone have any idea
> about
> this. Pls reply to my address, (and cc NS mailing list
> if
> you want to do so). Thank you very much.
>
>
>
>
>
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