[ns] How to test a new protocol? [nsrt-howto]
Dear ns-users, I am trying to implement a new protocol for NS-2 following the howto Implementing a New Manet Unicast Routing Protocol in NS2, which is available at http://masimum.dif.um.es/nsrt-howto/html/. After adding some missing header files, I could recompile NS with the new protocol, but I am not able to see the results. I defined a very simple scenario with 3 wireless nodes but I am not able to see the exchange of packets. However, with AODV or DSDV the tcl script works fine. I wonder if I should define a Protoname Agent (like in the example Ping of Marc Greis, but I get a segmentation fault, and I am not sure that it is really needed). If someone has any kind of tcl code or link to a scrip I would really appreciate the help. Best regards, Javi __ LLama Gratis a cualquier PC del Mundo. Llamadas a fijos y móviles desde 1 céntimo por minuto. http://es.voice.yahoo.com
[ns] error while executing mwnode-ex.tcl
Hi all,
I have copied ns-2.30.patch in folder ns-2.30.
Then patch it...as in your website.
Then ./configure
Then ./validate
When i run ns mwnode-ex.tcl , i got errors:
invalid command name Channel/Wireless
while executing
Channel/Wireless create _o14
invoked from within
catch $className create $o $args msg
invoked from within
if [catch $className create $o $args msg] {
if [string match __FAILED_SHADOW_OBJECT_ $msg] {
delete $o
return
}
global errorInfo
error class $...
(procedure new line 3)
invoked from within
new $val_(channel)
invoked from within
$ns_ wireless-config-routing$val_(routing) \
-mac$val_(mac) \
-phy...
(file mwnode-ex.tcl line 86)
Anybody can help me with this..?
Re: [ns] installation script doesn't consider /usr/include/X11 for X11 headers
paolalonetti wrote: maybe it's not a problem of NS, but it's a problem of your version of Linux. Try it: - modify your installation including the packets X. If you mean by that I should install the missing X headers: Of course, I did that. I'm not blaming NS for not finding dependent software non-existing on my machine -- that'd be too much of a demand. :-) The fault IMHO is that although the X11 headers are installed on my machine ns-2 won't find them but claim there're not installed. I've looked at a bunch of configure scripts and Makefiles but none seemed to include the path mentioned in the subject line. Since Debian and Debian-based distros represent a rather big share of the Linux market, I'll file this as a bug unless someone else can hint me at some possible mistake of mine. --Timo
[ns] definition of sending / receiving threshold per mobile node
Hi all, I am currently working on a project dealing with simulation of mobile nodes. To describe relevant network topologies I am searching for a possibility to define the receiving threshold individually per node (e.g. mobile node A has a receiving threshold of X, while all other nodes have a receiving threshold of Y). I know how to set the receiving threshold in principle via RXThresh_ but I unfortunately did not find any way of specifying this per node. Is anybody aware how to implement this? Best Regards, Markus
Re: [ns] definition of sending / receiving threshold per mobile node
Hi Markus, Leitner, Markus schrieb: I am currently working on a project dealing with simulation of mobile nodes. To describe relevant network topologies I am searching for a possibility to define the receiving threshold individually per node (e.g. mobile node A has a receiving threshold of X, while all other nodes have a receiving threshold of Y). I know how to set the receiving threshold in principle via RXThresh_ but I unfortunately did not find any way of specifying this per node. Is anybody aware how to implement this? I don't know if the following works for the threshold (it did for the antenna gain). Just give it a try. Set the threshold before you create a node. The node constructor will copy the value and you can change it later without changing the properties of already existing nodes. Maybe this is a bug - but we used it as a feature. Daniel. -- Dr.-Ing. Daniel Mahrenholz rt-solutions.de GmbH Oberländer Ufer 190a D-50968 Köln Web: www.rt-solutions.de rt-solutions.de networks you can trust.
[ns] urgent: help regarding euran programming
hi i have some problem in euran programming. i tried the test script these run fine. but i want to modify umts script. (in which current communication between node1-rnc and acknowledgement send to bs which is at node1.) but there is no communication to ue1 or ue2 which are connected by umts link. when i try to connect rnc and ue1 through wireless channel or by duplex link this gives error. please advice me how to send data to ue from node1 through base station through umts .. and i try to join euran's mailing list and join that no of time but no reply received from this. can u please tell me how to join this. thanks in advance harpreet singh
Re: [ns] help for implementation of the DCCP in NS
Have you tried this code? http://lifc.univ-fcomte.fr/~dedu/ns2/ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of zhang victor Sent: quarta-feira, 7 de Março de 2007 3:39 To: ns-users@ISI.EDU Subject: [ns] help for implementation of the DCCP in NS Hi,guys: I am trying to implement the DCCP in NS, does anyone have implemented it? and willing to share the source code and the detail implementation method. all the bests victor zhang
[ns] install ns-2.1b8-mcast
Hi, I am using ns2 to make some research of ad hoc multicast. I downloaded the ns wireless extension for multicast from the monarchproject site. I have exactly downloaded the file (ns-2.1b8-mcast.tar.gz). How would i integerate this in ns-allinone. I am working with ns-allinone-2.29.1. Is it possible to integerate (ns-2.1b8-mcast.tar.gz )with (ns-allinone-2.29.1) HOW??? Thanks Ana turk - Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.
[ns] install ns-2.1b8-mcast
Hi, I am using ns2 to make some research of ad hoc multicast. I downloaded the ns wireless extension for multicast from the monarchproject site. I have exactly downloaded the file (ns-2.1b8-mcast.tar.gz). How would i integerate this in ns-allinone. I am working with ns-allinone-2.29.1. Is it possible to integerate (ns-2.1b8-mcast.tar.gz )with (ns-allinone-2.29.1) HOW??? Thanks Ana turk - Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.
[ns] install ns-2.1b8-mcast
Hi, I am using ns2 to make some research of ad hoc multicast. I downloaded the ns wireless extension for multicast from the monarchproject site. I have exactly downloaded the file (ns-2.1b8-mcast.tar.gz). How would i integerate this in ns-allinone. I am working with ns-allinone-2.29.1. Is it possible to integerate (ns-2.1b8-mcast.tar.gz )with (ns-allinone-2.29.1) HOW??? Thanks Ana turk - Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.
Re: [ns] Doubts about MIPv4 simulation(wireless3.tcl)
Hi, 1.I am trying to understand March Greis tutorial(wireless3.tcl). When the MN moves within the HA area, there is a lot of dropped packets. The only line I modified is the setdest for MN. Why is this happening? (This is assuming that the default ranges for MN,HA and FA are 250m.) 2.Also where do we describe that some base_stn is the FA of a MN. We do set the FA with the hierarchical address in the program. But how does it realise that this heirarchical address is the FA. What if I want a lot of FA's. How do I simulate them? For HA we do an explicit definition but I dont see us doing this for FA. 3.When I use dsdv for routing protocol, a lot of packets are being dropped with base_stn unknown error. How do I avoid this error? I tried positioning the HA and FA so they are centers are 500m apart and give MN a straight line movement from the center of HA to the center of FA. Why are the packets still being dropped? Your help in understanding this implementation is greatly appreciated. Thank you in advance, Vidhya - Food fight? Enjoy some healthy debate in the Yahoo! Answers Food Drink QA.
Re: [ns] install ns-2.1b8-mcast
On 3/8/07, boutoumi bachira [EMAIL PROTECTED] wrote: Hi, I am using ns2 to make some research of ad hoc multicast. I downloaded the ns wireless extension for multicast from the monarchproject site. I have exactly downloaded the file (ns-2.1b8-mcast.tar.gz). How would i integerate this in ns-allinone. I am working with ns-allinone-2.29.1. Is it possible to integerate (ns-2.1b8-mcast.tar.gz )with (ns-allinone-2.29.1) HOW??? Thanks Ana turk What you do depends on what is in the files of ns-2.1b8-mcast.tar.gz. If it is only the added files try adding them (make a backup of your working ns-allinone tree first). If it is a set of patches apply them. If it is the whole thing you probably need to get a reference copy of ns-2.1b and do your own diff to make a set of patches to apply.
[ns] Sanity-check of energy consumption of 802.15.4 sensor nodes
Dear all, My question is actually a sanity-check of the energy consumption of IEEE 802.15.4 sensor nodes. I have a very simple simulation with a handful of wireless nodes employing IEEE 802.15.4 (ns2.29 code) and a wired sink. I have assumed 2AA batteries as the energy source, translating into 30.8 KJ for each sensor. There is no sleeping mode for the sensors, whenever they are not transmitting or receiving, they are in idle state. The transmission rate is 250 Kbps (@2.4GHz). If I run a simulation with 3 flows at 1 packet per second for a whole day (86.400 secs), the energy they are consuming is only around 250-300 J. Does this seem fairly reasonable to you? I was expecting their energy to be depleting much sooner since they are not using any sleeping schedule. Cheers, Athanasia PS. *other parameters I have used are: set opt(txpow) 0.0522 ;#calculated from P=VI with 17.4mA that corresponds to 0dBm TX power from MICAZ datasheet set opt(rxpow) 0.0591 ;# 19.7mA current drain set opt(idpow) 0.6;#20 \uA set opt(slpow) 0.03 ;# 1\uA -- Ms Athanasia Tsertou Research Associate Institute for Digital Communications School of Engineering and Electronics The University of Edinburgh Room 2.12, AGB Building, The Kings Buildings, Mayfield Road Edinburgh, EH9 3JL UK Tel:+44 (0)1316505659 Fax:+44 (0)1316506554 Email:[EMAIL PROTECTED]
Re: [ns] battery parameters in NS-2
The manual has a section about using node-config to setup those parameters. Search the manual for node-config -- hopefully that will help. -Scott On 8 Mar 2007 06:19:16 -, shalini c. thilakan [EMAIL PROTECTED] wrote: hi all, where can i find configuration files in NS-2 where all the battery parameters are specified?by battery parameters i mean the kind of wireless card to be used,the transmisson power ,the receptions power and other battery-related parameters.
[ns] R: SINR and NS-2 802.11 simulations
Hi, ns-2 physical layer modeling is notoriously weak. A patch solving some of the issues you mentioned is avaialble at http://www.reti.polito. it/fiore bye, Marco Messaggio originale Da: [EMAIL PROTECTED] cmu.edu Data: 8-mar-2007 3.21 AM A: ns-users@ISI.EDU Ogg: [ns] SINR and NS-2 802.11 simulations Hi, I have a question about NS- 2's 802.11 modeling (or lack there off) of SINR/SNR. I've been going through wireless-phy.cc and as far as I can tell,there's no SINR modeling at all. To receive a packet successfully, the receiving side checks if the received signal power strength is greater than both CSThreshold and RXThreshold. There's some mention of a capture threshold where if another packet is received at the same time, the first packet will be received successfully if its signal strength is CPThresh* the other signal. However, I don't see it being implemented any where. Am I reading this right? Is there no SNR or SINR modeling at all? And are there any patches that implement a more accurate physical layer and are good for MANET simulations? Thank you. Chun Ming Lee
[ns] Problems with ns2 installation in Linux
Hi, I'm trying to install the ns2.30 simulator in my Linux (Ubuntu 6.10 with gcc4.1 and g++4.1). I've already read the messages in the list where is written that I must change the gcc4.1 and g++4.1 to gcc4.0 and g++4.0. I've already tried it but it didn't work! The same problem is showed: final link failed: nonrepresentable... I don't know more what can I do! I'm following this tutorial: http://wiki.splitbrain.org/ns2 The versions that I'm trying to install are: otcl-1.12, tclcl-1.18 and ns-2.30. I really appreciate any kind of help! Ricardo.
Re: [ns] urgent: help regarding euran programming
hi
thanks for reply.
i use test_udp script and mannul to write program for umts euran. it runs fine.
but there is no communication between ue1 and base station. even i put the sink
at ue1. but the trace file show only communication between base-station, fixed
node and rnc. but no message send to ue1. program i use is
global ns
# Remove all Packet headers and add only those that are required.
# This significantly reduces the memory requirements of large simulations
remove-all-packet-headers
add-packet-header MPEG4 MAC_HS RLC LL Mac RTP TCP IP Common Flags
set ns [new Simulator]
set f [open out.tr w]
$ns trace-all $f
ChannelSwitcher set noSwitching_ true
set nf [open out.nam w]
$ns namtrace-all $nf
#Define a 'finish' procedure
proc finish {} {
global ns nf f
$ns flush-trace
#Close the trace file
close $nf
close $f
#Execute nam onthe trace file
exec nam out.nam
puts Simulation ended!
exit 0
}
Mac/Hsdpa set max_mac_hs_buffer_level_ 1000
$ns node-config -UmtsNodeType rnc
# Node address is 0.
set rnc [$ns create-Umtsnode]
$ns node-config -UmtsNodeType bs \
-downlinkBW 32kbs \
-downlinkTTI 10ms \
-uplinkBW 32kbs \
-uplinkTTI 10ms \
-hs_downlinkTTI 2ms \
-hs_downlinkBW 64kbs \
# Node address is 1.
set bs [$ns create-Umtsnode]
# Interface between RNC and BS
$ns setup-Iub $bs $rnc 622Mbit 622Mbit 15ms 15ms DummyDropTail 2000
$ns node-config -UmtsNodeType ue \
-baseStation $bs \
-radioNetworkController $rnc
# Node address for ue1 and ue2 is 2 and 3, respectively.
set ue1 [$ns create-Umtsnode]
set ue2 [$ns create-Umtsnode]
# Node address for node1 is 4
set node1 [$ns node]
# Connections between fixed network nodes
$ns duplex-link $rnc $node1 10Mbit 35ms DropTail 1000
$rnc add-gateway $node1
ChannelSwitcher set noSwitching_ true
#Setup a UDP connection
set udp [new Agent/UDP]
$udp set fid_ 0
$ns attach-agent $node1 $udp
#Setup a CBR over UDP connection
set cbr [new Application/Traffic/CBR]
$cbr attach-agent $udp
$cbr set type_ CBR
$cbr set packet_size_ 1000
$cbr set rate_ 4.2mb
$cbr set random_ false
set null [new Agent/Null]
#$null set fid_ 0
$ns attach-agent $ue1 $null
$ns connect $udp $null
$ns node-config -llType UMTS/RLC/AM \
-downlinkBW 64kbs \
-uplinkBW 64kbs \
-downlinkTTI 20ms \
-uplinkTTI 20ms \
-hs_downlinkTTI 2ms \
-hs_downlinkBW 64kbs
# Creat a DCH instead
set dch0 [$ns create-dch $ue1 $null]
# Tracing for all DCH traffic in downtarget
$rnc trace-inlink-tcp $f 0
$bs trace-outlink $f 2
# UE1 Tracing
$ue1 trace-inlink $f 2
$ue1 trace-inlink-tcp $f 2
###
$ns at 1.0 $cbr start
$ns at 5.0 $cbr stop
$ns at 6.0 finish
puts Simulation is running ... please wait ...
$ns run
and part of trace file look like
+ 1 4 0 cbr 1000 --- 0 4.0 2.0 0 0
- 1 4 0 cbr 1000 --- 0 4.0 2.0 0 0
+ 1.001905 4 0 cbr 1000 --- 0 4.0 2.0 1 1
- 1.001905 4 0 cbr 1000 --- 0 4.0 2.0 1 1
+ 1.00381 4 0 cbr 1000 --- 0 4.0 2.0 2 2
- 1.00381 4 0 cbr 1000 --- 0 4.0 2.0 2 2
+ 1.005714 4 0 cbr 1000 --- 0 4.0 2.0 3 3
- 1.005714 4 0 cbr 1000 --- 0 4.0 2.0 3 3
+ 1.007619 4 0 cbr 1000 --- 0 4.0 2.0 4 4
- 1.007619 4 0 cbr 1000 --- 0 4.0 2.0 4 4
+ 1.009524 4 0 cbr 1000 --- 0 4.0 2.0 5 5
- 1.009524 4 0 cbr 1000 --- 0 4.0 2.0 5 5
+ 1.011429 4 0 cbr 1000 --- 0 4.0 2.0 6 6
- 1.011429 4 0 cbr 1000 --- 0 4.0 2.0 6 6
+ 1.01 4 0 cbr 1000 --- 0 4.0 2.0 7 7
- 1.01 4 0 cbr 1000 --- 0 4.0 2.0 7 7
+ 1.015238 4 0 cbr 1000 --- 0 4.0 2.0 8 8
- 1.015238 4 0 cbr 1000 --- 0 4.0 2.0 8 8
+ 1.017143 4 0 cbr 1000 --- 0 4.0 2.0 9 9
- 1.017143 4 0 cbr 1000 --- 0 4.0 2.0 9 9
+ 1.019048 4 0 cbr 1000 --- 0 4.0 2.0 10 10
- 1.019048 4 0 cbr 1000 --- 0 4.0 2.0 10 10
+ 1.020952 4 0 cbr 1000 --- 0 4.0 2.0 11 11
- 1.020952 4 0 cbr 1000 --- 0 4.0 2.0 11 11
+ 1.022857 4 0 cbr 1000 --- 0 4.0 2.0 12 12
- 1.022857 4 0 cbr 1000 --- 0 4.0 2.0 12 12
+ 1.024762 4 0 cbr 1000 --- 0 4.0 2.0 13 13
- 1.024762 4 0 cbr 1000 --- 0 4.0 2.0 13 13
+ 1.026667 4 0 cbr 1000 --- 0 4.0 2.0 14 14
- 1.026667 4 0 cbr 1000 --- 0 4.0 2.0 14 14
+ 1.028571 4 0 cbr 1000 --- 0 4.0 2.0 15 15
- 1.028571 4 0 cbr 1000 --- 0 4.0 2.0 15 15
+ 1.030476 4 0 cbr 1000 --- 0 4.0 2.0 16 16
- 1.030476 4 0 cbr 1000 --- 0 4.0 2.0 16 16
+ 1.032381 4 0 cbr 1000 --- 0 4.0 2.0 17 17
- 1.032381 4 0 cbr 1000 --- 0 4.0 2.0 17 17
+ 1.034286 4 0 cbr 1000 --- 0 4.0 2.0 18 18
- 1.034286 4 0 cbr 1000 --- 0 4.0 2.0 18 18
r 1.0358 4 0 cbr 1000 --- 0 4.0 2.0 0 0
+ 1.03619 4 0 cbr 1000 --- 0 4.0 2.0 19 19
- 1.03619 4 0 cbr 1000 --- 0 4.0 2.0 19 19
r 1.037705 4 0 cbr 1000 --- 0 4.0 2.0 1 1
+ 1.038095 4 0 cbr
[ns] HHelp: Propagation delay for wireless link
waht is the role of the following function in channel.cc, WirelessChannel:: get_pdelay (Node* tnode, Node* rnode) it returns propagation delay between two nodes ?. if this is truth, which is the difference between this returned delay by this function and the delay which can obtained by the difference between time of reception and time of transmission. - Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.
Re: [ns] flooding.tcl (hierarchical network)
Check my page http://tagus.inesc-id.pt/~pestrela/ns2/ns2_haddr_tips.html about my address conversion functions Pedro Vale Estrela Type of Addresses that a node can have in NS2 (hAddr, ID, iAddr, Handle) In NS2, a node can be uniquely identified by several forms the handle is the otcl name; it refers to an object of the form _oXXX, and because of this, it is the only form can be used to directly call internal instprocs and variables. the haddr is the Hierarchical address, on the form X.Y.Z the iaddr is the INTEGER hierarchical address, where the haddr string is simply ENCODED in a 32 bit integer. the id is the sequential Node ID of the simulator. The proposed variable names and contents are outlined in the following table. For unknown nodes or in error conditions, the value -1 is generally used. http://tagus.inesc-id.pt/~pestrela/ns2/ns2_haddr_tips.html In my ns2_shared_procs.tcl utils tcl file, I introduce procs for all possible conversions of each form, using the procs handle2iaddr, handle2haddr, handle2id, etc. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of feel2chat Sent: quinta-feira, 8 de Março de 2007 20:52 To: ns-users@ISI.EDU Subject: Re: [ns] flooding.tcl (hierarchical network) Will the problem was in a hierarchical network the addresses are represented as doted string (i.e. 0.8.1) so you need to convert the address to int in the script. to convert the address use something like this: set addressObj [[$ns get-AllocAddrBits ] get-Address] set ip [$addressObj str2addr $addr] cheers, Z On 2/25/07, feel2chat [EMAIL PROTECTED] wrote: I have been trying to run the flooding.tcl example but using a hierarchical network (created using sgb2hierns), yet it didn't work. It seems the code does not find the right neighbour nodes, I wonder what I'm missing? The example work perfect on a flat network. Cheers, Z
[ns] How to use VBR traffic in NS2 instead of CBR?
Hi friends, I have to use VBR traffic instead of CBR.How to change the CBR traffic to VBR traffic in NS2? How to diffrentiate different applications in NS2 like voice ,video and data ? Please help Thanks in advance, Taraka __ Yahoo! India Answers: Share what you know. Learn something new http://in.answers.yahoo.com/
[ns] Classfier::no-slot{} default handler (tcl/lib/ns-lib.tcl)
Hi all,
When I run a ring-topology protocol script,I get an error listed below.
Would you please tell me how to deal with it? Thanks
I saw the response of a similar question, he commented make sure it is fully
connected.
My topology is
n0 --- n1 n2 --- n0
Isn't it fully connected ?
set ns [new Simulator]
$ns color 1 Blue
$ns color 2 Red
$ns color 3 Orange
# Open the trace files
set tracefile1 [open out.tr w]
$ns trace-all $tracefile1
# Open a 'finish' procedure
proc finish {} {
global ns tracefile1 namfile
$ns flush-trace
close $tracefile1
close $namfile
exit 0
}
# Create 6 nodes
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
$n0 label Master
$n1 label Slave1
$n2 label Slave2
# Create links between the nodes
$ns simplex-link $n0 $n1 25Mb 0ns DropTail
$ns simplex-link $n1 $n2 25Mb 0ns DropTail
$ns simplex-link $n2 $n0 25Mb 0ns DropTail
$ns simplex-link-op $n0 $n1 orient right-up
$ns simplex-link-op $n1 $n2 orient right-down
$ns simplex-link-op $n2 $n0 orient down
set most0 [new Agent/MOST]
$ns attach-agent $n0 $most0
set most1 [new Agent/MOST]
$ns attach-agent $n1 $most1
set most2 [new Agent/MOST]
$ns attach-agent $n2 $most2
$ns connect $most0 $most1
$ns connect $most1 $most2
$ns connect $most2 $most0
$ns at 0.1 $most0 start
$ns at 10.0 finish
$ns run
[ns] ns-2 help
hello can anubody tell me how to implement alternate path routing in ns-2 bye __ Yahoo! India Answers: Share what you know. Learn something new http://in.answers.yahoo.com/
[ns] warning on TwoStateErrorModel
Greetings, I just wanted to warn people who intend to use TwoStateErrorModel and its derivatives. Note that the transitionState() function of this class upperbounds the duration of state_1 with 120 seconds. This is done in errmodel.cc in ns v2.30. I do not know the reason behind this upperlimit, but if I am not mistaken, this upperbound makes it pointless to assign an average duration to state_1 at the time this class is instantiated. I would be happy to hear what others think. Regards, Guray
[ns] MultiStateErrorModel and tcl calls
Greetings all, This is a question on MultiStateErrorModel. I see that the model's corrupt(Packet* p) function makes a tcl call for each packet. Unless I misunderstood chapter-3 of the manual, this is really supposed to slow down the simulation. Has anyone experienced slow performance with MultiStateErrorModel, or is there anything I am missing here? Cheers, Guray
[ns] ns-2 help
Hi, ns-users Have anyone heard about the Alternate Path Routing there is a paper on this subject, originated by D. Zappala, Does anyone knowwhether this protocol has been implemented in ns2? If the answer is yes, where can I find the source code? Tks for the help. P.B.BHAVATHANKAR. M.Tech (COMPUTER) VJTI, MUMBAI __ Yahoo! India Answers: Share what you know. Learn something new http://in.answers.yahoo.com/
