Re: [ns] run examples in ns2
you should add relevant directories to the environment variables, otherwise bash could not locate where ns is. Date: Fri, 26 Oct 2007 09:32:49 -0700 From: [EMAIL PROTECTED] To: ns-users@ISI.EDU Subject: [ns] run examples in ns2 Hello ns-users, I m installing ns 2.27 on Windows XP. When i run examples in Xwin, ns example1.tcl, it always says: bash: ns: command not found. Why? Thanks! Best regards, Min Meng _ Windows Live Custom Domain，您的免费电子邮局。 https://domains.live.com/default.aspx
[ns] Where can I find SCTP module for ns-2.26?
Hi everyone, I'm looking for SCTP module for ns-2.26. I know sctp is now integrated into newer versions of ns-2 distributions. But I need the patch for ns-2.26. I googled it but found none. I tried to move the sctp-related codes in ns-2.31 to ns-2.26 but I failed. It will cause segmentation fault during simulation. Can anyone help me? Thanks a lot! Yaogong _ Windows Live Spaces 中最年轻的成员！ http://miaomiaogarden2007.spaces.live.com/
Re: [ns] TCP segment size vs. IP packet size
1) It's the size in Bytes of the TCP payload, excluding TCP header and IP header. eg. If you set packetSize_ of the TCP Agent to be 1000, then the actual size of the IP datagram is 1040. You can validate this from the trace file. 2) I don't think it matters anything. Queue limit is measured in packets. The size of the packet doesn't affect anything. 3) I'm not sure about it. Date: Thu, 13 Sep 2007 15:15:21 +0200 From: [EMAIL PROTECTED] To: ns-users@ISI.EDU Subject: [ns] TCP segment size vs. IP packet size Hi, I need some help distinguishing cases when NS is thinking about TCP segments vs. when it's thinking about IP packets, since it seems to me that they're used almost interchangeably. In particular: 1) Is packetSize_ in TPC agents the IP packet size or TCP segement size? 2) When using a command like $ns queue-limit $n0 $n1 100, is the queue limit expressed as the number of TCP segments or IP packets? Does the distinction even make sense in this case? 3) When simulating web traffic (such as in tcl/ex/web-traffic.tcl) using a command like $pool create-session 1 $numPage 0.2 $interPage $pageSize $interObj $objSize is objSize in TCP segments or IP packets? Again, is the distinction meaningful here? -- Jasin _ 用 Live Search 搜尽天下资讯！ http://www.live.com/?searchOnly=true
[ns] Help me with the DCCP module!
Hi all, I'm using the DCCP module contributed by: http://lifc.univ-fcomte.fr/~dedu/ns2/ in ns-2.31. But when I tried the simple script in the attachment, I got the following error: DCCPAckVector::sendAckVector - Failed to add ack vector to option: err -1, size 254 Can anyone help me out? It's really urgent! Thank you. Yaogong _ Windows Live Spaces 中最年轻的成员！ http://miaomiaogarden2007.spaces.live.com/
Re: [ns] For Throughput comparison of TCP Reno, Tahoe , SACK
There is a classic paper on this: Simulation-based Comparisons of Tahoe, Rent, and SACK TCP by Kevin Fall and Sally Floyd. And the scripts used in this paper seem to be available in the ns package. Date: Tue, 4 Sep 2007 22:31:09 -0700 From: [EMAIL PROTECTED] To: ns-users@ISI.EDU Subject: [ns] For Throughput comparison of TCP Reno, Tahoe , SACK Hello I m a novice NS user. If i want to see some throughput comparison of TCP Reno, Tahoe, SACK --- which steps i need to follow. If someone can help me providing some good URL for learning my queries i will be grateful. [EMAIL PROTECTED] wrote: Welcome to posting to the ns-users mailing list! We automatically send this message to every new person who sends mail to the list. You should only receive it once. My apologies if the program contacts you twice, perhaps because you have multiple e-mail addresses or send mail from multiple machines. If you are an experienced ns-user who simply has not posted since we started using this responder, our apologies for inconveniencing you with this message. This message is intended to help inform users and cut down on redundant posts, which benefits everyone.! Please look at the attached list of ns Frequently Asked Questions. If it answers your question, great! You're done. If not, please RE-SEND your original message to [EMAIL PROTECTED] A copy of your original message is included below for reference. You will NOT have to do re-send your message every time you post, only the FIRST time you send from a new account. The goal is to quickly help new users find the FAQ (hopefully answering their question). Thanks, -the ns development team The Network Simulator ns-2: Frequently Asked Questions (This FAQ is also on the web at http://www.isi.edu/nsnam/ns/ns-faq.html.) * _Where do I get ns?_ From the ns web site at http://www.isi.edu/nsnam/ns/ns.html and the download page http://www.isi.edu/nsnam/ns/ns-tests.html. * _What platforms does ns run on and what kind of hardware do I need?_ Please see where to start on the building ns web page: http://www.is! i.edu/nsnam/ns/ns-build.html#start. * _What should I do if I have t rouble downloading/extracting ns?_ This question is answered in detail at http://www.isi.edu/nsnam/ns/ns-problems.html#downloading. * _What should I do if I encounter problems building ns?_ Check: 1. the README that comes in the distribution (very brief), 2. the installation problems, bug fixes and help web page http://www.isi.edu/nsnam/ns/ns-problems.html, 3. the archives of the ns-users mailing list http://www.isi.edu/nsnam/ns/ns-lists.html, 4. post a bug report (see below) http://www.isi.edu/cgi-bin/nsnam/reportbug.cgi. * _What do I do after I successfully build ns?_ + Put the path to your ns executable into your PATH environment + Put the path to your otcl into your LD_LIBRARY_PATH environment + Put the path to your tcl library into your TCL_LIBRARY environment * _Where can I find documentation for ns?_ All documentation is linked from the main ns web page http://www.isi.edu/nsnam/ns/. Documentation includes a tutorial (originally fro! m Marc Greis) and a reference manual (ns notes and documentation). * _Words, words, words... that documentation is nice, but where are some sample scripts I can start from?_ Many sample scripts can be found in the ns distribution in ~ns-2/tcl/ex and ~ns-2/tcl/test. * _What protocols does ns support?_ A lot! Almost all variants of TCP, several forms of multicast, wired networking, several ad hoc routing protocols and propagation models (but not cellular phones), data diffusion, satellite, and other stuff. See the documentation (described above) for details, or download ns and look. * _How do I know that ns correctly implements these protocols?_ Ns has validation tests that cover many protocols, see http://www.isi.edu/nsnam/ns/ns-tests.html. However, ultimately users are responsible for verifying that ns is accurate for their purposes---since we cannot foresee all the ways ns may be used, we cannot test all cases with all inputs. * _Are there a! ny contributed/additional protocols not in the main distribution?_ Yes, please see the contributed code web page http://www.isi.edu/nsnam/ns/ns-contributed.html. The mailing list archives can also be helpful (see below). * _How should I get started doing something (like implementing a new protocol or trying an experiment)?_ We recommend that you look through the tutorial (see documentation, above), then start with an example program that is most similar to yours (in the tutorial, or in tcl/ex or tcl/test in the distribution), and then start changing things. * _What should I do to compile ns to reflect my changes if I've modified some .cc or .h files?_ go to ns directory and run make or make depend; make * _How do I subscribe to the ns-users mailing list? How do I search old list
[ns] a question about Nils-Erik Mattsson's DCCP module
I'm using Mattsson's DCCP module under ns-2.26. But when I simulate DCCP in large BDP networks, I sometimes get the following error and the program exits: DCCPAckVector::sendAckVector - Failed to add ack vector to option: err -1, size 256 I took a look at the source code and found that the error stems from the length of the options exceeding DCCP_OPT_MAX_LENGTH(=255 by default). So I set the macro to be 1023, hoping that would solve the problem. But when I run the simulation again after modifying the macro, I get some other errors: 21.610164, DCCP/TCPlike(_o216)::send_packetRecv() - No ack vector on acknowledgment! 21.610184, DCCP/TCPlike(_o216)::processOption() - ECN check failed! The only change I made to the source code is just setting the value of the macro bigger. I don't know what's wrong. Can anyone help me? _ 用 Live Search 搜尽天下资讯！ http://www.live.com/?searchOnly=true
Re: [ns] Generating background web traffic
the following link may be helpful: http://www4.ncsu.edu/~rhee/export/bitcp/cubic-script/script.htm it's the script written by the inventors of CUBIC and it contains adding web traffic as background traffic. Date: Fri, 31 Aug 2007 20:55:06 +0200 From: [EMAIL PROTECTED] To: ns-users@ISI.EDU Subject: [ns] Generating background web traffic Hi, I'm trying to recreate the experiments from this paper http://www.hamilton.ie/net/pfldnet2007_cubic_final.pdf in ns. Some experiments study the impact of web traffic on the CUBIC. What would be the best/simplest way to simulate web traffic in ns? Should I use a Pareto traffic sources with an UDP agent? The paper mentions mean time between requests and mean connection size in packets. What would be reasonable values to assign to the rate_ and shape_ parameters? -- Jasin _ 用 Live Search 搜尽天下资讯！ http://www.live.com/?searchOnly=true
Re: [ns] segmentation fault
segmentation fault usually stems from illegal access to the memory. check
your code to see whether you illegally try to access some memory when it is
already deallocated. usually it's because using pointers incorrectly.
Date: Wed, 22 Aug 2007 11:52:11 -0700 From: [EMAIL PROTECTED] To:
ns-users@ISI.EDU Subject: [ns] segmentation fault Hello all, I wrote
a new agent. this agent has a command{} which receives 6 arguments. I use the
following line to pass the arguments to the command{}. $ns at $now
$source-ad($j) ad-request $j $peak $error $standard-dev but when I run my
tcl script. I receive this error: segmentation fault can anybody help me
about this error?any kind of help. Thanks in advance Regards Elahe
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