[ns] ns-2.34 validation tests fail (64bit-processor)
Hello, I successfuly installed ns2.34 on a MacOS(Lion). My Mac is a (Core i7-64bit processor). When I execute ./validate and these tests fail: validate overall report: some portable tests failed: ./test-all-newreno ./test-all-sack ./test-all-tcpOptions ./test-all-tcpLinux ./test-all-tcpHighspeed ./test-all-red ./test-all-cbq ./test-all-webtraf some non-portable tests also failed: ./test-all-srm ./test-all-smac-multihop ./test-all-hier-routing ./test-all-algo-routing ./test-all-mcast ./test-all-vc ./test-all-session ./test-all-mixmode ./test-all-webcache ./test-all-mcache ./test-all-plm ./test-all-wireless-tdma to re-run a specific test, cd tcl/test; ./test-all-TEST-NAME Do you know what should I do? I read in the official Nsnam Troubleshooting page that “ns-2 is known to have problems with some validation tests on certain platforms due to 64-bit problems”. I am not sure if theses tests fail because of the 64-bit processor but if it's the case is there a solution? Thanks in advance for your reply.
[ns] Error while installing NS2.35 to Mac OS(Lion)
Hi all, I've downloaded ns-allinone-2.35 and extracted into the directory /Users/username/ (where username refers to my username on my Mac). Then, I run ./install and it fails to build OTcl-1.14, as you can see below: * Build OTcl-1.14 No .configure file found in current directory Continuing with default options... checking build system type... i386-apple-darwin11.3.0 checking host system type... i386-apple-darwin11.3.0 checking target system type... i386-apple-darwin11.3.0 checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for g++... g++ checking whether we are using the GNU C++ compiler... yes checking whether g++ accepts -g... yes checking how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /usr/bin/grep checking for egrep... /usr/bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for string.h... (cached) yes checking for main in -lXbsd... no checking for socket in -lsocket... no checking for gethostbyname in -lnsl... no checking for dcgettext in -lintl... no checking for getnodebyname in -ldnet_stub... no checking that g++ can handle -O2... no checking standard STL is available... no checking for tcl.h... -I../include checking for tclInt.h... -I../include checking for libtcl8.5... -L../lib -ltcl8.5 checking for init.tcl... ../lib/tcl8.5 checking for http.tcl... ../lib/tcl8.5/http1.0 checking Tcl http.tcl library... yes checking for tclsh8.5.10... no checking for tclsh8.5... ../bin/tclsh8.5 checking for tk.h... -I../include checking for libtk8.5... -L../lib -ltk8.5 checking for tk.tcl... ../lib/tk8.5 checking for X11 header files checking for X11 library archive checking for XOpenDisplay in -lX11... no checking for libXext.a checking for ranlib... ranlib checking for a BSD-compatible install... /usr/bin/install -c checking system version (for dynamic loading)... Darwin-11.3.0 checking for dlopen in -ldl... yes No explicit static compilation flag; setting V_STATIC to no dynamic load lib checking system version (for system-dependent libraries)... Darwin-11.3.0 checking for unistd.h... (cached) yes checking for a BSD-compatible install... /usr/bin/install -c configure: creating ./config.status config.status: creating Makefile creating ./gen creating ./bin rm -f libotcl.a otcl.o gcc -c -g -O2 -DNDEBUG -DUSE_SHM -DHAVE_UNISTD_H=1 -I. -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/include otcl.c otcl.c: In function ‘FindProc’: otcl.c:784: warning: cast to pointer from integer of different size otcl.c: In function ‘PrimitiveODestroyNoFree’: otcl.c:1008: warning: cast from pointer to integer of different size otcl.c: In function ‘OTclODestroyMethod’: otcl.c:1300: warning: cast from pointer to integer of different size ar cq libotcl.a otcl.o ranlib libotcl.a rm -f libotcl otcl.o so_locations gcc -c -g -O2 -DNDEBUG -DUSE_SHM -DHAVE_UNISTD_H=1 -fPIC -I. -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/include otcl.c otcl.c: In function ‘FindProc’: otcl.c:784: warning: cast to pointer from integer of different size otcl.c: In function ‘PrimitiveODestroyNoFree’: otcl.c:1008: warning: cast from pointer to integer of different size otcl.c: In function ‘OTclODestroyMethod’: otcl.c:1300: warning: cast from pointer to integer of different size o libotcl otcl.o make: o: No such file or directory make: [libotcl] Error 1 (ignored) rm -f libotcl gcc -o otclsh -g -O2 -I. -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/include otclAppInit.c \ -L. -lotcl -L/Users/behnaz/ns-allinone-2.35/lib -ltk8.5 -L/Users/behnaz/ns-allinone-2.35/lib -ltcl8.5 -L/usr/X11R6/lib -lXext -lX11 -lm Undefined symbols for architecture x86_64: _CFLocaleCopyCurrent, referenced from: _TclpSetVariables in libtcl8.5.a(tclUnixInit.o) _CFLocaleGetIdentifier, referenced from: _TclpSetVariables in libtcl8.5.a(tclUnixInit.o) _CFStringGetCString, referenced from: _TclpSetVariables in
[ns] Fwd: ns-2.34 validation tests fail (64bit-processor)
Hello Tom,
If you remember some ns-2.34 validation tests failed on my machine (MAC OS
Lion, 10.7.3, Intel Core i7), so I installed ns-2-35 and still the validation
failed for:
./test-all-tcpLinux ./test-all-tcpHighspeed/test-all-red ./test-all-cbq
Then you proposed that I send the output of ./validate validate.log to you,
but I have not yet received any news from you or some one else regarding this
problem (so I forward my last email again , see below).
BTW, in your last email, you said that:
If you aren't using these specific models in your work, you have less to worry
about.
I would like to do some simulations for IEEE 802.11 MAC layer and also use some
routing protocols , for sure
that validation tests failures for TCP will not be a problem, my only concern
is that these tests fail:
/test-all-red ./test-all-cbq
Do you think that will cause a problem for my simulations if I these models do
not work properly on my machine?
Thanks in advance for your reply,
Kind regards,
Behnaz
Begin forwarded message:
From: Behnaz Bostanipour behnaz.bostanip...@unil.ch
Subject: Re: [ns] ns-2.34 validation tests fail (64bit-processor)
Date: 10 août 2012 16:53:33 HAEC
To: behnaz.bostanip...@unil.ch
Thanks for your reply. If I understood well, I should execute this in my
terminal:
./validate validate.log
But this results to no output on the terminal and I cannot bring back the
command prompt unless by pressing (ctrl+c).
Actually I found in folder /Users/username/ns-allinone-2.35/ns-2.35, a
validate.log that I send to you in the attachment.
Although I don't think that it's relevant to failures of validation tests,
but actually I had to do some changes in install file in order to be able
to install both ns2.34 and ns2.35 on my machine (precisely my machine is a
10.7.3, Intel Core i7) . In fact with both versions of ns2, after running the
./install I got this error:
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [otclsh] Error 1
otcl-1.14 make failed! Exiting ...
So wherever I had ./configure... in install file, I added the following:
--x-libraries=/usr/X11R6/lib --x-includes=/usr/X11R6/include
CFLAGS=-framework CoreFoundation
An example of my changes in install file can be found below (the line that
I added is bold):
echo
echo * Build OTcl-$OTCLVER
echo
cd ./otcl-$OTCLVER
blame='Please check http://www.isi.edu/nsnam/ns/ns-problems.html
for common problems and bug fixes.'
if [ ${test_cygwin} = true ]; then
./configure --x-libraries=/usr/X11R6/lib
--x-includes=/usr/X11R6/include --with-tcl-ver=$TCLVER --with-tk-ver=$TKVER
--disable-shlib || die otcl-$OTCLVER configuration failed! Exiting ...;
..
else
./configure --x-libraries=/usr/X11R6/lib
--x-includes=/usr/X11R6/include CFLAGS=-framework CoreFoundation
--with-tcl-ver=$TCLVER --with-tk-ver=$TKVER || die otcl-$OTCLVER
configuration failed! Exiting ...;
.
fi
cd ..
# Build tclcl
Just in case I send you my install file in the attachment.
Thanks,
Best,
Behnaz
On 10 août 2012, at 07:18, Tom Henderson wrote:
On 08/09/2012 08:59 AM, behnaz.bostanip...@unil.ch wrote:
Hi,
Thanks for your reply. I installed ns2.35 and actually the
majority of these problems are solved. But still these tests
fail:
validate overall report: some tests failed:
./test-all-tcpLinux ./test-all-tcpHighspeed
/test-all-red ./test-all-cbq
whith a closer look I noticed this error message for these
tests:
couldn't execute xgraph: no such file or directory
This shouldn't cause validation errors.
I don't have a 10.7 64-bit test machine at my disposal so I can't try to
reproduce at the moment. I have 10.6.8 32-bit machine which doesn't
exhibit that. I also have a newly-upgraded 10.8 64-bit machine, but
there are other issues related to X11 changes in Mountain Lion that, for
now, are blocking me to test it there.
Anyway, I would suggest to send to me or post to the tracker [*] the
output of this:
./validate validate.log
so that someone can look at the specific errors reported. If you aren't
using these specific models in your work, you have less to worry about.
- Tom
[*] http://sourceforge.net/tracker/?group_id=149743atid=775392
Re: [ns] ns-2.34 validation tests fail (64bit-processor)
On 29 août 2012, at 15:00, Tom Henderson wrote: Could you please send the full validate output? It seems like the file you sent is truncated at 2204 lines. Thanks for your reply. I opened this one in my texShop and it has 7167 lines. Best, Behnaz
Re: [ns] ns-2.34 validation tests fail (64bit-processor)
Hello Tom, Thanks for your reply. I put some comments on your email below: On 30 août 2012, at 16:13, Tom Henderson wrote: On 08/29/2012 06:50 AM, behnaz.bostanip...@unil.ch wrote: I'm not able to reproduce that error, so I would like to see some examples of the diffed output. Would you mind collecting all of the *.test output files for the tests that failed and send them to me in a tarball, such as: cd tcl/tests find . -name *.test -type f | xargs tar cvfj ns-2-diffs.tbz2 and send me the ns-2-diffs.tbz2 file? Thanks, Tom Here you are, I exactly execuuted your command, but not sure if it has all the outputs that we want (i.e., for tests: test-all-tcpLinux, test-all-tcpHighspeed, test-all-red and test-all-cbq. There seem to be a few things going on here. for the test-all-cbq and test-all-red files, the data seems correct but the formatting is slightly off: there are commas for periods in some of the outputs. e.g. test-output-red/flows-combined.test == flows_combined.test == TitleText: test_flows_combined Device: Postscript flow 1 84,8786 74,1902 48,3181 46,8733 vs. test-output-red/flows-combined (good output) TitleText: test_flows_combined Device: Postscript flow 1 84.8786 74.1902 48.3181 46.8733 This may have something to do with the version of xgraph on the system. Yes, if you look at the validation output, whenever a test fails , it says: couldn't execute xgraph: no such file or directory So, maybe I should do something about my graph, (e.g., reinstall it or …, do you have any suggestions?) for the tcpLinux and tcpHighspeed tests, there are lines missing (either truncated, or interleaved in the test output) from the output when compared to the reference output. I don't know whether this is again a post-processing error or whether the simulation is not producing the same data. The test-output-xcp data is different: 0.12186 420 0.12186 420 0.12186 420 0.12228 8 0.12228 8 vs 0.12186 420 0.12186 420 0.12186 420 0.12228 819 0.12228 819 In summary, I would be suspicious of the use of the tcpLinux, tcpHighspeed, and xcp models on this platform. To debug this probably requires to step through the code at the points where the output diverge, using also a platform such as Linux that produces the reference output. I don't have ns-2 running on Mountain Lion yet but I'll check whether similar issues arise there. - Tom As I explained in my last email, I would like to do some simulations for IEEE 802.11 MAC layer and also use some routing protocols , I don't think that validation tests failures for TCP will not be a problem, my only concern is that these tests fail: /test-all-red ./test-all-cbq Do you think that will cause a problem for my simulations if I these models do not work properly on my machine? Thanks, Behnaz
[ns] NS2 development using Xcode IDE
Hello, Has anybody used Xcode IDE for developing and running ns2 code on MAC OS? It would be nice to present a source that explains how one can do it. Thanks in advance, RGDS, Behnaz
Re: [ns] NS2 development using Xcode IDE
Thank you for the link. But my question was mostly related to how people usually develop and run simulations. I mean I can create a .tcl file and run it using e.g., this command in the terminal: ns name of tcl file, But I was wondering if one can use Xcode or another IDE instead, Best, Behnaz On 5 sept. 2012, at 16:06, Stephan Lorenz wrote: see: http://mailman.isi.edu/pipermail/ns-users/2011-February/069537.html On Wed, Sep 5, 2012 at 9:14 AM, Behnaz Bostanipour behnaz.bostanip...@unil.ch wrote: Hello, Has anybody used Xcode IDE for developing and running ns2 code on MAC OS? It would be nice to present a source that explains how one can do it. Thanks in advance, RGDS, Behnaz
Re: [ns] ns 2.35/4 on MAC OS Mountain Lion (10.8)
Hi, see this (works for both lion and mouton lion): http://old.nabble.com/build-nam-on-mac-OSx-td34431429.html Here is the url for the patch: http://old.nabble.com/file/p34431582/install.osx.patch Best, Behnaz On Sep 30, 2012, at 12:08 PM, bcaceiro bcace...@gmail.com wrote: Hello everyone, I've been having huge problems trying to install ns-2 on my mac. Since it always fails to compile for tcl, and I know is something related to x11 libraries . I have installed xquartz, and Xcode( witih the command line tools) but probably is something about the path or the commands in the install file . Did anyone managed to install it ? -- View this message in context: http://old.nabble.com/ns-2.35-4-on-MAC-OS-Mountain-Lion-%2810.8%29-tp34491383p34491383.html Sent from the ns-users mailing list archive at Nabble.com.
Re: [ns] ns 2.35/4 on MAC OS Mountain Lion (10.8)
Actually, the first line of the content of my .profile was truncated in the email, so here it is again: export PATH=$PATH:/Users/behnaz/ns-allinone-2.35/bin:/Users/behnaz/ns-allinone-2.35/tcl8.5.10/unix:/Users/behnaz/ns-allinone-2.35/tk8.5.10/unix:/Users/behnaz/ns-allinone-2.35/nam-1.15/bin export LD_LIBRARY_PATH=/Users/behnaz/ns-allinone-2.35/otcl-1.14:/Users/behnaz/ns-allinone-2.35/lib export TCL_LIBRARY=/Users/behnaz/ns-allinone-2.35/tcl8.5.10/library But basically, once you install the ns2, it is displayed in the terminal that you should configure these environment variables, and their exact values on your system are also given. Best, Behnaz On Oct 1, 2012, at 3:50 PM, Bruno Caceiro bcace...@gmail.com wrote: Hello again, thanks for the help, though it didn't worked as I expected, since I still get that ns isn't a command found for bash . I copied the code you gave me , replacing my username, and , for instance the name of the folder is ns-allinone--RC8, and I changed it all according to what you sent me. Even made a .profile and saved it in My Users/bcaceiro. Or this profile should be saved in the ns folder ? Thanks again for all the help provided . Best regards . 2012/9/30 behnaz.bostanip...@unil.ch Well,I executed this in the directory /Users/behnaz/ns-allinone-2.35/ns-2.35: echo “PATH=/Users/behnaz/ns-allinone-2.35/bin:$PATH” .bashrc where /Users/behnaz is the home directory, also, I created a ‘.profile’ in my home directory and I put the following inside it: export PATH=$PATH:/Users/behnaz/ns-allinone-2.35/bin:/Users/behnaz/ns-allinone-2.35/tcl8.5.10/unix:/Users/behnaz/ns-$ export LD_LIBRARY_PATH=/Users/behnaz/ns-allinone-2.35/otcl-1.14:/Users/behnaz/ns-allinone-2.35/lib export TCL_LIBRARY=/Users/behnaz/ns-allinone-2.35/tcl8.5.10/library Best regards, Behnaz - Original Message - Expéditeur: bcaceiro bcace...@gmail.com à: ns-users@ISI.EDU Sujet: Re: [ns] ns 2.35/4 on MAC OS Mountain Lion (10.8) Date: Sun, 30 Sep 2012 09:06:24 -0700 (PDT) Hello it worked like charm , it compiled with no errors, but now how can I edit the bash profile to make it work ? since i tried to do like :ns example.tcl and it doesn't recognize anything .. bostanip wrote: Hi, see this (works for both lion and mouton lion): http://old.nabble.com/build-nam-on-mac-OSx-td34431429.html Here is the url for the patch: http://old.nabble.com/file/p34431582/install.osx.patch Best, Behnaz On Sep 30, 2012, at 12:08 PM, bcaceiro bcace...@gmail.com wrote: Hello everyone, I've been having huge problems trying to install ns-2 on my mac. Since it always fails to compile for tcl, and I know is something related to x11 libraries . I have installed xquartz, and Xcode( witih the command line tools) but probably is something about the path or the commands in the install file . Did anyone managed to install it ? -- View this message in context: http://old.nabble.com/ns-2.35-4-on-MAC-OS-Mountain-Lion-%2810.8%29-tp34491383p34491383.html Sent from the ns-users mailing list archive at Nabble.com. -- View this message in context: http://old.nabble.com/ns-2.35-4-on-MAC-OS-Mountain-Lion-%2810.8%29-tp34491383p34497283.html Sent from the ns-users mailing list archive at Nabble.com. -- Bruno Caceiro
Re: [ns] Error while installing NS2.35 to Mac OS(Lion)
install.osx.patch patch: Can't open patch file install.osx.patch : No such file or directory Can you direct me to the patch or post it again? Would be grateful. NAmanquah Tom Henderson-2 wrote: On 08/08/2012 11:49 PM, Behnaz Bostanipour wrote: Hi all, I've downloaded ns-allinone-2.35 and extracted into the directory /Users/username/ (where username refers to my username on my Mac). Then, I run ./install and it fails to build OTcl-1.14, as you can see below: * Build OTcl-1.14 No .configure file found in current directory Continuing with default options... checking build system type... i386-apple-darwin11.3.0 checking host system type... i386-apple-darwin11.3.0 checking target system type... i386-apple-darwin11.3.0 checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for g++... g++ checking whether we are using the GNU C++ compiler... yes checking whether g++ accepts -g... yes checking how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /usr/bin/grep checking for egrep... /usr/bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for string.h... (cached) yes checking for main in -lXbsd... no checking for socket in -lsocket... no checking for gethostbyname in -lnsl... no checking for dcgettext in -lintl... no checking for getnodebyname in -ldnet_stub... no checking that g++ can handle -O2... no checking standard STL is available... no checking for tcl.h... -I../include checking for tclInt.h... -I../include checking for libtcl8.5... -L../lib -ltcl8.5 checking for init.tcl... ../lib/tcl8.5 checking for http.tcl... ../lib/tcl8.5/http1.0 checking Tcl http.tcl library... yes checking for tclsh8.5.10... no checking for tclsh8.5... ../bin/tclsh8.5 checking for tk.h... -I../include checking for libtk8.5... -L../lib -ltk8.5 checking for tk.tcl... ../lib/tk8.5 checking for X11 header files checking for X11 library archive checking for XOpenDisplay in -lX11... no checking for libXext.a checking for ranlib... ranlib checking for a BSD-compatible install... /usr/bin/install -c checking system version (for dynamic loading)... Darwin-11.3.0 checking for dlopen in -ldl... yes No explicit static compilation flag; setting V_STATIC to no dynamic load lib checking system version (for system-dependent libraries)... Darwin-11.3.0 checking for unistd.h... (cached) yes checking for a BSD-compatible install... /usr/bin/install -c configure: creating ./config.status config.status: creating Makefile creating ./gen creating ./bin rm -f libotcl.a otcl.o gcc -c -g -O2 -DNDEBUG -DUSE_SHM -DHAVE_UNISTD_H=1 -I. -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/include otcl.c otcl.c: In function ‘FindProc’: otcl.c:784: warning: cast to pointer from integer of different size otcl.c: In function ‘PrimitiveODestroyNoFree’: otcl.c:1008: warning: cast from pointer to integer of different size otcl.c: In function ‘OTclODestroyMethod’: otcl.c:1300: warning: cast from pointer to integer of different size ar cq libotcl.a otcl.o ranlib libotcl.a rm -f libotcl otcl.o so_locations gcc -c -g -O2 -DNDEBUG -DUSE_SHM -DHAVE_UNISTD_H=1 -fPIC -I. -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/include otcl.c otcl.c: In function ‘FindProc’: otcl.c:784: warning: cast to pointer from integer of different size otcl.c: In function ‘PrimitiveODestroyNoFree’: otcl.c:1008: warning: cast from pointer to integer of different size otcl.c: In function ‘OTclODestroyMethod’: otcl.c:1300: warning: cast from pointer to integer of different size o libotcl otcl.o make: o: No such file or directory make: [libotcl] Error 1 (ignored) rm -f libotcl gcc -o otclsh -g -O2 -I. -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/Users/behnaz/ns-allinone-2.35/include -I/include otclAppInit.c \ -L. -lotcl -L/Users/behnaz/ns-allinone-2.35/lib -ltk8.5 -L/Users/behnaz/ns-allinone-2.35/lib -ltcl8.5 -L/usr/X11R6/lib -lXext -lX11 -lm Undefined symbols for architecture x86_64
Re: [ns] what is the meaning of HDR_CMN?
Hi, It is the common header for NS2 packets. I would suggest that you read the ns2 manual or look here : http://nile.wpi.edu/NS/ for this type of questions. Best, Behnaz On Nov 5, 2012, at 1:39 PM, shiny shiny@gmail.com wrote: hi frndz, what is the meaning of HDR_CMN? where this member function was defined in ns2. -- With Regards, John Shiny.J
[ns] Broadcast a UDP packet using 802.11 MAC layer broadcast
Hello, I would like a source node (n0) to broadcast CBR packets via UDP to 1 hop neighbors (n1,n2) in a in a wireless dhoc network. One way, could be to attach the source to each destination as below: set udp1 [new Agent/UDP] $ns attach-agent $n0 $udp1 set src1 [new Application/Traffic/CBR] $src1 attach-agent $udp1 set null1 [new Agent/Null] ns attach-agent $n1 $null1 ns attach-agent $n2 $null1 $ns connect $udp1 $null1 $ns at 0.1 $src1 start $ns at 50 finish I think in this case the same packet at the mac layer is sent by unicasting once from n0 to n1 and once from n0 to n2. But, what if I would like to use a broadcast at MAC layer? I saw that in MAC header you actually can set the type to MAC_BROADCAST but I don't know how to force to use it when I send a CBR packet. Thanks, Behnaz
[ns] one hop Wireless Broadcast of CBR packets
Hello, I would like a source node (n0) to broadcast CBR packets via UDP to 1 hop neighbors (n1,n2) in a wireless dhoc network. I've tried the following solution: One way, could be to attach the source to each destination as below: set udp1 [new Agent/UDP] $ns attach-agent $n0 $udp1 set src1 [new Application/Traffic/CBR] $src1 attach-agent $udp1 set null1 [new Agent/Null] ns attach-agent $n1 $null1 ns attach-agent $n2 $null1 $ns connect $udp1 $null1 $ns at 0.1 $src1 start $ns at 50 finish But in this case the CBR packets are only recieved by node n2. What should I do? Any help would be appreciated.. Thanks, Behnaz
[ns] Where is the tcl implementation of FTP or CBR?
Hi all, Sorry for this easy question but I always have the same problem when I want to find c++ or tcl implementation of an ns2 element. Is there any source where I can find the path of classes? For instance, in which directory is the TCL class for FTP or CBR? Thanks in advance, Behnaz
[ns] Implement a key-value list in TCL
Hi, I need to make a key-value list in TCL (where key is the time and value is the (x,y) coordinates of a mobile node). However the command keyless of the tclX does not recognized in NS2 environment and I can not use keyed list structure of tclX. Do you have a code example or implementation of a key-value list or a hash map in ns2 (TCL) side. Thanks, B.
Re: [ns] Fragmentation in SMAC
Hi, I do not know anything about SMAC, but usually if you have a UDP agent connected to your CBR application, the fragmantation is done by UDP. So, a UDP packet is by default 1000 bytes. if your CBR sends less than 1000 bytes to UDP, the CBR bytes are put in one UDP packet and the packet is sent to the MAC layer. Hope this helps, Best, B. - Original Message - Expéditeur: faraz iqbal faraz4...@yahoo.com à: ns-users@isi.edu ns-users@ISI.EDU Sujet: [ns] Fragmentation in SMAC Date: Mon, 19 Nov 2012 05:40:22 -0800 (PST) Hi All I have CBR 512 kbps in tcl but it is not doing fragmentation in 50 byte per packet according to SMAC C++ code. Further more, if i select CBR of 300 bytes then it has to show fragments of 50 bytes in trace file, means 6 fragments (packets) of 50 bytes, Am i right.? How can i control fragmentation in smac.? please help. Regards Faraz
Re: [ns] Error Model
Hello, Personally I have not seen the use of Error Models in Wireless Networks. I thought that they are only used for modeling transmission error in wired networks. As I am also working on wireless networks, that would be nice if you could send me the link for a wireless example in which an error model is used. Thanks, Regards - Original Message - Expéditeur: Fazlullah Khan fazlullah@gmail.com à: ns-users ns-users@ISI.EDU Sujet: [ns] Error Model Date: Mon, 26 Nov 2012 11:46:52 +0900 Hi everybody! How to add NS2 built-in Error Models in Wireless Networks. I followed the NS example and some other tutorials but could not implement it. -- Regards Fazlullah Khan Department of Electrical Electronics and Information Engineering, Nagaoka University of Technology, Nagaoka-shi , Niigata-ken, Japan Cell # +8180 3474 4286
Re: [ns] how to get value from .cc file to tcl script?????
Hi, Tcl tcl=Tcl::instance(); tcl.resultf(%1.1f,value); where resultf(const char* fmt,...) uses the C++ format fmt of printf to passe a string to the TCL interpreter. There are other functions similar to resultf. I am sure you can find them easily on the Web. Best, Behnaz - Original Message - Expéditeur: itishi saxena itish...@yahoo.com à: ns-users@ISI.EDU ns-users@ISI.EDU, mohit.ni...@yahoo.com mohit.ni...@yahoo.com Sujet: [ns] how to get value from .cc file to tcl script? Date: Tue, 27 Nov 2012 09:11:33 +0800 (SGT) Hello Friends, How it is possible to check a value of a parameter in the tcl script from a .cc code? e.g. in AODV i have declared a variable and assigning a value at certain point. I want tcl script can read that value so that I can perform some other operation in tcl script. I know use of bind( x_ , x) and it works like passing value from tcl to .cc, what if I want other way around from .cc to tcl?? Any clue will be appreciated. with Regards.
[ns] Default Channel bandwidth in 802.11?
Hello, I would like to calculate transmission time (tx_time) for packets sent by CMU MAC 802.11. Usually we have tx_time=packet size/channel bandwidth. I looked in the ns-default.tcl file and I have found this value: Phy/WirelessPhy set bandwidth_ 2e6 Is this the value used for calculation of tx_time by 802.11? Thanks, Behnaz
Re: [ns] Default Channel bandwidth in 802.11?
Hello Saravanan, Thanks for your reply! Ok, I checked this function and basically and if I understood correctly, in function sendData for broadcast packets we call txtime() as below: ch-txtime() = txtime(ch-size(), basicRate_); So, roughly speaking the txtime for a broadcast data packet is as following: txtime= plcp_hdr/plcpdataRate + datalength/dataRate_ where basicRate_=bandwidth_ according to implementation of constructor of mac-802.11.cc. But I still have some questions, that I would really be greateful if you reply: 1) How we know the value of bandwidth_ is Phy/WirelessPhy set bandwidth_, I though that I should find something like Mac 802.11 set bandwidth_ in ns-default.tcl 2)How should I choose the value of basicRate_, if I would like to set it my self? Thanks, Best regards, Behnaz - Original Message - Expéditeur: Saravanan Kandasamy svana...@gmail.com à: ns-users@ISI.EDU ns-users@ISI.EDU Sujet: Re: [ns] Default Channel bandwidth in 802.11? Date: Sun, 2 Dec 2012 13:28:46 + Dear Behnaz, Looks like you don't quite understand how MAC 802.11 works. Phy/WirelessPhy set bandwidth_ 2e6 will only be used if you have not set basicRate_ or dataRate_ in your MAC setup. Even so the transmission time does not do packet size/channel bandwidth, suggest you to study how Mac802_11::txtime(double psz, double drt) function works in mac-802.11.cc Good Luck. rgds Saravanan K On Sun, Dec 2, 2012 at 1:02 PM, Behnaz Bostanipour behnaz.bostanip...@unil.ch wrote: Hello, I would like to calculate transmission time (tx_time) for packets sent by CMU MAC 802.11. Usually we have tx_time=packet size/channel bandwidth. I looked in the ns-default.tcl file and I have found this value: Phy/WirelessPhy set bandwidth_ 2e6 Is this the value used for calculation of tx_time by 802.11? Thanks, Behnaz
[ns] call-back from mac-802.11.cc to interface queue
Hi all,
As I checked in mac-802.11.cc, it seems that interface queue only sends one
packet at a time to MAC 802.11 (but i am not 100% sure) and it waits to dequeue
and send the next packet to 802.11 MAC until a callback is triggered by
mac-802.11.
So the call back is triggered by mac-802.11 in tx_resume()
oid
Mac802_11::tx_resume()
{
double rTime;
assert(mhSend_.busy() == 0);
assert(mhDefer_.busy() == 0);
if(pktCTRL_) {
…. }
} else if(pktTx_) {
….
}
}
} else if(callback_) {
Handler *h = callback_;
callback_ = 0;
h-handle((Event*) 0);
}
setTxState(MAC_IDLE);
}
am I right?
Thanks,
Behnaz
Re: [ns] Default Channel bandwidth in 802.11?
Hello, Thanks for you reply but my question is : 1) How we know the value of bandwidth_ is Phy/WirelessPhy set bandwidth_, I though that I should find something like Mac 802.11 set bandwidth_ in ns-default.tcl and 2)How should I choose the value of basicRate_, if I would like to set it my self? I mean what are usually the values that we choose. Best regards. Behnaz - Original Message - Expéditeur: Saravanan Kandasamy svana...@gmail.com à: ns-users@ISI.EDU ns-users@ISI.EDU Sujet: Re: [ns] Default Channel bandwidth in 802.11? Date: Sun, 2 Dec 2012 13:28:46 + Dear Behnaz, Looks like you don't quite understand how MAC 802.11 works. Phy/WirelessPhy set bandwidth_ 2e6 will only be used if you have not set basicRate_ or dataRate_ in your MAC setup. Even so the transmission time does not do packet size/channel bandwidth, suggest you to study how Mac802_11::txtime(double psz, double drt) function works in mac-802.11.cc Good Luck. rgds Saravanan K On Sun, Dec 2, 2012 at 1:02 PM, Behnaz Bostanipour behnaz.bostanip...@unil.ch wrote: Hello, I would like to calculate transmission time (tx_time) for packets sent by CMU MAC 802.11. Usually we have tx_time=packet size/channel bandwidth. I looked in the ns-default.tcl file and I have found this value: Phy/WirelessPhy set bandwidth_ 2e6 Is this the value used for calculation of tx_time by 802.11? Thanks, Behnaz
Re: [ns] problem in ns2.35 installation
Hello,
1) Please send your questions to the ns mailing list and not only to a specific
user (in this case not only to me). So please do not repeat this.
2) There was a whole discussion regarding this problem in the mailing list, so
I do not know which part of the discussion you have found, but
briefly, a patch is written for installation of ns2-35 by Tom Henderson, here
is the url for the patch:
http://old.nabble.com/file/p34431582/install.osx.patch
The attached workaround patch allows to build ns-allinone-2.35 on Mac
OS X Mountain Lion 64-bit server.
cd ns-allinone-2.35
patch -p1 -i install.osx.patch
./install
Best regards,
Behnaz
On Dec 5, 2012, at 10:58 AM, Sandhya Aneja sandhya.an...@gmail.com wrote:
Hello Behnaz,
I am installing ns2.35 on MAC OS Lion, 10.7.3. I am not able to compile otcl
for which you have suggested following changes in install file.
if [ ${test_cygwin} = true ]; then
./configure --x-libraries=/usr/X11R6/lib
--x-includes=/usr/X11R6/include --with-tcl-ver=$TCLVER --with-tk-ver=$TKVER
--disable-shlib || die otcl-$OTCLVER configuration failed! Exiting ...;
..
else
./configure --x-libraries=/usr/X11R6/lib
--x-includes=/usr/X11R6/include CFLAGS=-framework CoreFoundation
--with-tcl-ver=$TCLVER --with-tk-ver=$TKVER || die otcl-$OTCLVER
configuration failed! Exiting ...;
.
It is showing
./install: line 480: syntax error near unexpected token `else'
./install: line 480: `else'
Please suggest what is the problem
Thanks
Sandhya
Re: [ns] Schedule the backoff timer in mac-802_11
Itishi - No, ack mechanism in 802.11 DCF is used for unicast packets, in this
code we are faced to mac broadcast, and there is no ack mechanism for mac
broadcast regardless of version of ns2.
M. Falahati - i am also working on mac-802.11, the code is very complicated,
as I understood :
About evolution of backoff timer: as I see before calling
Mac802_11::transmit(Packet *p, double timeout), in function
Mac802_11::check_pktTx(), we call setTxState(MAC_SEND), this will cause:
inline void
Mac802_11::setTxState(MacState newState)
{
tx_state_ = newState;
checkBackoffTimer();
}
which will call:
Mac802_11::checkBackoffTimer()
{
if(is_idle() mhBackoff_.paused())
mhBackoff_.resume(phymib_.getDIFS());
if(! is_idle() mhBackoff_.busy() ! mhBackoff_.paused())
mhBackoff_.pause();
}
so by this call of checkBackoffTimer(), I think we're in the second if and
therefore mhBackoff_.pause() is called and backoff timer is paused during
transmission.
Then, once packet is transmitted in Mac802_11::send_timer(), for broadcast
packets we have:
case MAC_SEND:
RetransmitDATA();
break;
……
….
}
tx_resume();
so as you indicated in RetransmitDATA(), we have:
rst_cw();
mhBackoff_.start(cw_, is_idle());
So if is_idle() == true, the call of mhBackoff_.start causes the backoff
timer to start to count down; else it causes the timer to freeze. Here the
state is still MAC_SEND so the timer will be still freezed.
Then in tx_resume() by call of setTxState(MAC_IDLE), we cause
:mhBackoff_.resume(phymib_.getDIFS());.
So I think what you said is true, by I also do not understand why we should
call mhBackoff_.start(cw_, is_idle()) in retransmit data since the backoff
timer is already freezed for the transmission.
I also do not understand what happens if in Mac802_11::check_pktTx(), the
medium is always busy ? i mean do we backoff all the time as below?
if(! is_idle()) {
sendRTS(ETHER_ADDR(mh-dh_ra));
inc_cw();
mhBackoff_.start(cw_, is_idle());
return 0;
}
Or is there a limit for the maximum number of back-off tries.
Hope this helps,
Best Regards,
Behnaz
On Dec 5, 2012, at 10:57 PM, itishi saxena itish...@yahoo.com wrote:
For each transmission MAC waits for its ack if ack did not receive on
time...it retransmit at time assigned by backoff time... in ns-2.34, MAC
tries 7 times before declaring link break.
I don't know that why is the following highlight line used in *
Mac802_11::RetransmitDATA()* function?
It is the function responsible for that retransmission...I m talknig about
ns-2.34...I hope mechanism is similar for ns-2.35.
From: M Falahati md.falah...@gmail.com
To: ns-users@ISI.EDU
Sent: Thursday, 6 December 2012 2:55 AM
Subject: [ns] Schedule the backoff timer in mac-802_11
Dear All,
I'm studying on implementation of mac-802_11 in ns-2.35.
I don't know that why is the following highlight line used in *
Mac802_11::RetransmitDATA()* function?
==
*if((u_int32_t)ETHER_ADDR(mh-dh_ra) == MAC_BROADCAST)
{
Packet::free(pktTx_);
pktTx_ = 0;
rst_cw();
mhBackoff_.start(cw_, is_idle());
return;
}*
==
I think that line runs following steps:
1- it invokes *BackoffTimer::start()* that because of *idle* parameter is
zero, then *pause*_ parameter will set to one.
2- *tx_resume()* in the *Mac802_11::send_timer()* invokes
*setTxState()*and changes
*tx_state* to *MAC_IDLE* , then invokes *checkBackoffTimer()*.
3- *checkBackoffTimer()* invokes *mhBackoff_.resume()* and backoff timer
will schedule with [0-CWMin] + DIFS value.
Are above steps true?
If answer is true,is it necessary to start backoff timer (with value
between [0-CWMin] + DIFS) after sending a broadcast packet?
Sincerely Yours.
[ns] PriQueue queueing delay
Hi friends, Is there a formula to calculate packet delay in a prioritized queue of a mobile node? I mean if a CBR connected to UDP, sends a pocket at rate r to a PriQueue, what is the queuing delay? I know that a queue can only send down a packet if (in this cases) the underlying MAC 802.11 does a call back , so queuing delay also depends on the basic rate_ or data rate_ of the mac layer and also the backoff interval. Can somebody knows how should we see this process from the queuing theory or Kendall theorem? Thanks, Behnaz
[ns] Patch to install NS2.35 to Mac OS(Lion)/Mountain Lion
Hello, Just by a deeper search you could find the link for the patch since it has been posted in this forum by me many times until now (last time was last week). So, I guess I send it for the very last time: http://old.nabble.com/file/p34431582/install.osx.patch you can find the instructions of how to use the patch for installation in my previous replies regarding this subject. Best regards, Behnaz On Dec 17, 2012, at 10:39 PM, Fuat Basık fuatba...@gmail.com wrote: Hello Everyone, I also have the same problem. I will be happy if you can send patch to me? e-mail: fuatba...@gmail.com Thanks in advance.
[ns] Shadowing propagation model
Hi all, As far as I understood we can use the shadowing propagation model for wireless simulation only with Mac/802_11Ext and not with Mac/802_11. Am I right? Thanks, behnaz
[ns] Code example of using Mac/802_11Ext
Hi All, Has any one a model of using Mac/802_11Ext? Thanks, Best, Behnaz
[ns] Simulate 802.11b or g
Hi, Does any body have an example of how should I put the parameters of Mac-802_11Ext or Mac_802_11 to implement 802.11 b or g? I know that some patch written for this in ns-miracle but it seems complicated to use. Thanks, Behnaz
[ns] Is 802.11 multi rate only used for unicast in dei80211mr-1.1.4/nsmiracle?
Hello all, I read somewhere that most network cards use multirate only in unicast mode and for broadcast they use only the basic rate (i.e., 1 or 2 Mbps in 802.11b/b+g, 6Mbps in 802.11a/g). Is it the case if in dei80211mr-1.1.4/nsmiracle implementation. I would really appreciate your reply, Thanks, Behnaz
[ns] Parameters of 802.11Ext to simulate 802.11 b/g
Hello, In ns2.35/tcl/ex/IEEE.802-11.a.tcl, we have the parameters to simulate 802.11a with 802.11Ext module. As I read in documentations of 802.11Ext, the parameters for 802.11 b/g should be set by the user. Below is the content of EEE.802-11.a.tc, I wonder if it is sufficient to only change these parameters to simulate 802.11 b/g. Phy/WirelessPhyExt set CSThresh_6.31e-12;#-82 dBm Wireless interface sensitivity (sensitivity defined in the standard) Phy/WirelessPhyExt set Pt_ 0.001 Phy/WirelessPhyExt set freq_5.18e+9 Phy/WirelessPhyExt set noise_floor_ 2.512e-13 ;#-96 dBm for 10MHz bandwidth Phy/WirelessPhyExt set L_ 1.0 ;#default radio circuit gain/loss Phy/WirelessPhyExt set PowerMonitorThresh_ 1.259e-13 ;#-99dBm power monitor sensitivity Phy/WirelessPhyExt set HeaderDuration_ 0.20;#20 us Phy/WirelessPhyExt set BasicModulationScheme_ 0 Phy/WirelessPhyExt set PreambleCaptureSwitch_ 1 Phy/WirelessPhyExt set DataCaptureSwitch_ 0 Phy/WirelessPhyExt set SINR_PreambleCapture_2.5118; ;# 4 dB Phy/WirelessPhyExt set SINR_DataCapture_100.0; ;# 10 dB Phy/WirelessPhyExt set trace_dist_ 1e6 ;# PHY trace until distance of 1 Mio. km (infinty) Phy/WirelessPhyExt set PHY_DBG_ 0 Mac/802_11Ext set CWMin_15 Mac/802_11Ext set CWMax_1023 Mac/802_11Ext set SlotTime_ 0.09 Mac/802_11Ext set SIFS_ 0.16 Mac/802_11Ext set ShortRetryLimit_ 7 Mac/802_11Ext set LongRetryLimit_ 4 Mac/802_11Ext set HeaderDuration_ 0.20 Mac/802_11Ext set SymbolDuration_ 0.04 Mac/802_11Ext set BasicModulationScheme_0 Mac/802_11Ext set use_802_11a_flag_ true Mac/802_11Ext set RTSThreshold_ 2346 Mac/802_11Ext set MAC_DBG 0 In fact, 802.11a and 802.11b use OFDM and the signal is spread over 20 MHz while 802.11 b uses DSSS modulation and the signal is spread over 22 MHz but I do not know how to change these parameters. Thanks, Best regards, Behnaz
[ns] How noise_floor_ is chosen for 802.11a
Hello, I would like to use an implementation of 802.11a which can be found in file IEEE802-11a.tcl, under the directory: .../ns-allinone-2.35/ns-2.35/tcl/ex/802.11 This implementation uses Phy/WirelessPhyExt and Mac/802_11Ext of ns2. So, I read the documentation about 802.11a standard and also the code of Phy/WirelessPhyExt.cc. As I understood in implemtation of Phy/WirelessPhyExt.cc, there is no RXThreshold_ and there is a CSThreshold_ which is only used to inform the upper mac layer about the fact that the carrier is busy. But the decision to keep or drop a packet is made roughly speaking by the below comparisons: if (Pr(or received signal power) / noise_floor_ =SNIR (of basic scheme) and if (Pr(or received signal power) / noise_floor_ =SNIR (of body modulation scheme) then signal could be received. Where basic scheme is a modulation scheme used for the header and the body scheme id the modulation scheme used for the body and which both by default are BPSK modulation with 1/2 coding rate. So I have two questions: 1) By default in IEEE802-11a.tcl, the value of noise_floor_ is 2.512e-13 which corresponds to -96 dBm for 10MHz bandwidth. I could not find how this value is set. Since, I could not find something which corresponds to the noise floor in the official documentation of 802.11a. Also, since 802.11a channel bandwidth is 20Mhz; should not we increase this value? 2) Is there a way in this model (i.e., Phy/WirelessPhyExt and Mac/802_11Ext ), to define the transmission range for a node? I guess it should be independent of CSThreshold_. Thanks in advance for your time and consideration, Behnaz
[ns] Nakagami, shadowing or Rayleigh RF model?
Hello, Which RF model among one shadowing, Nakagami or Rayleigh are better for MANETs simulation in indoor and outdoor simulations? As I understood Nakagami is better for mobility situations and Vanet scenarios, but I do not know the exact difference between these models. Also I saw that Rayleigh is used for dense urban conditions, so it could also be an alternative instead of shadowing model. Thanks in advance for the answer, Behnaz P.s. I read NS manual and did not find the comparaison.
[ns] BonnMotion and MAC-OS
Hi, Just a question : have anybody tried to install and use BonnMotion on a MAC-OS. Thanks, Best, behnaz
[ns] Create circular random topology for ad hoc wireless
Hello, I would like to place randomly 1800 wireless nodes in a circle of radius 600m. How could I generate a circular random topology like this? I would appreciate your reply, Thanks, Behnaz
[ns] reference distance for Shadowing propagation model
Hello, By default the reference distance for shadowing model is 1. Which I suppose is 1meter. I read the manual but it is not still clear to me how we choose distance? and How does it influence the reception power. Thanks for your reply in advance, Behnaz
[ns] what is antenna gain unit in ns2?
Hello, In ns2, default.tcl we have : Antenna/OmniAntenna set Gt_ 1.0 Antenna/OmniAntenna set Gr_ 1.0 what is the unit of the gain? watts or dBm? Thanks, Behnaz
Re: [ns] received signal power
Hello, It's called P_r and is usually calculated using a propagation model such as Two Ray Ground or shadowing. You can find more details in the ns manual chapter radio propagation. Best, Behnaz On Jun 27, 2013, at 10:51 PM, Fatma LOUATI fatma.lou...@gmail.com wrote: hi ns-users, How can I have the the power received at a destination? Is that done for the each paket? thkx
Re: [ns] received signal power
Well, you need to better study the propagation.cc and related source codes under ns-2/mobile/. For example in propagation.cc and in all its subclasses there is a function double Propagation::Pr(PacketStamp *, PacketStamp *, WirelessPhy *) which returns p_r given the packet and the wireless physical interface. Best, Behnaz On Jun 27, 2013, at 11:38 PM, Fatma LOUATI fatma.lou...@gmail.com wrote: hi, first of all thkx for your quick reply. I already know that but what I need how I can print the power received during a simulation ?(2 nodes 1 source and 1 destination) thkx 2013/6/27 Behnaz Bostanipour behnaz.bostanip...@unil.ch Hello, It's called P_r and is usually calculated using a propagation model such as Two Ray Ground or shadowing. You can find more details in the ns manual chapter radio propagation. Best, Behnaz On Jun 27, 2013, at 10:51 PM, Fatma LOUATI fatma.lou...@gmail.com wrote: hi ns-users, How can I have the the power received at a destination? Is that done for the each paket? thkx
Re: [ns] MTU handling for 802.11 in NS2
Hello,
The default size of udp packets is defined in ̃/ns /tcl/lib/ns-default.tcl as
1000 bytes. Now, when udp receives a CBR packet it does this (Look at
̃/ns/apps/udp.cc):
void UdpAgent::sendmsg(int nbytes, AppData* data, const char* flags)
{
Packet *p;
int n;
if (size_)
n = nbytes / size_;
else
printf(Error: UDP size = 0\n);
if (nbytes == -1) {
printf(Error: sendmsg() for UDP should not be -1\n);
return;
}
// If they are sending data, then it must fit within a single packet.
if (data nbytes size_) {
printf(Error: data greater than maximum UDP packet size\n);
return;
}
while (n-- 0) {
p = allocpkt();
hdr_cmn::access(p)-size() = size_;
hdr_rtp* rh = hdr_rtp::access℗;
rh-flags() = 0;
rh-seqno() = ++seqno_;
hdr_cmn::access(p)-timestamp() =
(u_int32_t)(SAMPLERATE*local_time);
// add beginning of talkspurt labels (tcl/ex/test-rcvr.tcl)
if (flags (0 ==strcmp(flags, NEW_BURST)))
rh-flags() |= RTP_M;
p-setdata(data);
target_-recv(p);
}
n = nbytes % size_;
if (n 0) {
p = allocpkt();
hdr_cmn::access(p)-size() = n;
hdr_rtp* rh = hdr_rtp::access(p);
rh-flags() = 0;
rh-seqno() = ++seqno_;
hdr_cmn::access(p)-timestamp() =
(u_int32_t)(SAMPLERATE*local_time);
// add beginning of talkspurt labels (tcl/ex/test-rcvr.tcl)
if (flags (0 == strcmp(flags, NEW_BURST)))
rh-flags() |= RTP_M;
p-setdata(data);
target_-recv(p);
}
idle();
}
SO for each CBR packet of 1500 bytes it sends 2 udp packets. If you want no
fragmentation, you should set the default size of udp packet in ns_default.tcl
to 1500 bytes.
Best,
Behnaz
On Jun 30, 2013, at 3:15 AM, Dhrubojyoti Roy r...@cse.ohio-state.edu wrote:
I've designed a routing protocol that works over 802.11 in NS2. I have
used a standard CBR source attached to a UDP agent to simulate traffic
in the network. I find that when I change the CBR packet-size to 1500
from 1000, the number of packets in the system doubles for the same data
rate; so there is fragmentation happening somewhere in the lower layers.
However, I'm unable to find the code segment that handles this
fragmentation in any of the C++ modules. I know that mac-802_3.h defines
an IEEE_8023_MAXFRAME, but I don't see an MTU defined in mac-802_11.h or
mac.h. So I'm curious as to how and where the data packets actually get
fragmented. Is it implemented in mac itself, or in the link/physical
layers? If someone could point me in the right direction, that would be
great.
Thanks in advance,
Dhrubo.
--
Dhrubojyoti Roy
PhD Student (2nd year)
Department of Computer Science and Engineering,
The Ohio State University,
2015 Neil Avenue,
Columbus, OH-43210.
+1-740-417-5890
Re: [ns] How noise_floor_ is chosen for 802.11a
Hello, I have recently received many emails sent only to my email address and not to ns-users mailing list, with questions regarding ns-2. I would like to clarify this once for all: please send your emails only to ns2 mailing list and stop spanning specific users like me Ns2- mailing list is made so that you can share your questions with all ns2-users, and you will receive an answer if some one is wiling to send a reply to you. In this way, the reply could be seen by other users and will remain in the archive so it could be useful for other users who have the same question. Thanks for you understanding, Best regards, On Jul 2, 2013, at 11:40 AM, Kriti Gupta kritigupt...@gmail.com wrote: hello sir i am doing a project in manets i need to calculate throughput of tcp for wired scenario and wireless scenario can u provide me the tcl script in ns2 for wired and wireless network and awk script to calculate throughput for wired network. plzzz help me as i am new to this. On Fri, Jun 28, 2013 at 3:01 AM, Bostanip behnaz.bostanip...@unil.ch wrote: Well, after many months I know the answer. The noise floor is defined in the official documentation of 802.11a and corresponds to thermal noise of the system. -- View this message in context: http://network-simulator-ns-2.7690.n7.nabble.com/How-noise-floor-is-chosen-for-802-11a-tp26183p27187.html Sent from the ns-users mailing list archive at Nabble.com.
Re: [ns] reading a variable in aodv.cc from channel.cc and channel.h
Hi,
It's a segmentation fault since you create an uninitilized object
WirelessChannel *tifp in your aodv class and after you call your function for
this null object. Note that segmentation fault usually occurs when you call a
function for a null object.
Thus, you should first initialize WirelessChannel *tifp to the channel
object assicited to the aodv object.
See, you have a node where aodv is running and for this node you have an
associated physical layer and below the physical layer you have an associated
channel.
I had a similar problem some time ago, where in application layer I wanted to
access physical layer, so I used the code below:
//To enable packet discard writing
MobileNode* node_ =
(MobileNode*)(Node::get_node_by_address(here_.addr_));
WirelessPhyExt* physicalLayer =
(WirelessPhyExt*)(node_-ifhead()).lh_first;
physicalLayer-writePktDiscardToFile();
Note that I used WirelessPhyExt ( a variant of WirelessPhy) in my program
so in your case you should replace it with WirelessPhy.
Now in your case, you want to access the channel associated to the physical
layer so as I saw in the ns2 library you need to get the channel_ object of
the physical layer and then call your function for it.
I think this code should work to get the node object in the network layer
(i.e., aodv), if this does not work, in any case you should find a way to
access to the associated channel object of your node when adov is running.
Hope this helps,
Best regards,
Behnaz
On Jul 11, 2014, at 1:39 PM, Alireza Shamsoshoara a.shamsosho...@gmail.com
wrote:
Hello
I'm working on my MS thesis and I want to use some value from a variable in
channel.cc , this variable return the Pr and Pt , power of receiver and
power of transmitter respectively. so i defined a variable (getvalue_)
and a function (getvalue) in channel.h (channel header file) in this way:
[channel.h :]
class WirelessChannel : public Channel {
public:
...
WirelessChannel(void);
double getvalue_;
inline double getvalue() {return getvalue_;}
}
and also in channel.cc ,call the variable and equal it to the function that
desire to read :
[channel.cc]
void
WirelessChannel::calcHighestAntennaZ(Phy *tifp)
{
...
getvalue_ = wifp-getPt();
printf(P_t = %f\n,getvalue_);
...
}
it's noticable that getvalue_ is printed in channel.cc
but when call the function getvalue in AODV.CC
[AODV.cc]
{
void
AODV::recvRequest(Packet *p) {
...
WirelessChannel *tifp;
double x=tifp-gethighestAntennaZ();
printf(x = %f\n,x);
double y=tifp-getvalue();
printf(y = %f\n,y);
...
}
the value of x is printed in terminal but
but for the getvalue function segmentation fault occur.
what should i do to read a variable from other cc files? which part of
above i was wrong that segmentation fault happened?
Thanks in advance for your help.
__
Alireza Shamsoshoara, M.Sc.
Faculty of Electrical and Computer Engineering (ECE)
K.N.Toosi University of Technology
Tehran, IRAN.
