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Erwin Harahap do Now or Never
Archive for February, 2012
Questioning Mac Posted by Erwin on February 6, 2012 1. How to remote a windows pc via ssh tunnel ssh [pc.remote.address] -L [pc-remote-port]:[pc-name]:[tunnel-port] then use RDC and type –> localhost:[pc-remote-port] 2. Remote from PC to Mac visit this link — > http://dailycupoftech.com/remote-control-mac-from-windows-in-progress/ (http://dailycupoftech.com/remote-control-mac-from-windows-in-progress/) Posted in Uncategorized | Tagged: mac, problem | Leave a Comment »
Questioning NS2 Posted by Erwin on February 1, 2012 I use this question for my own purpose only. Anyone can use it with your own risk. There’s no guarantee the script or anything else will work here. Any comment is welcome but don’t expect any replies. Spam comment will be trashed. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
How is packet created ? What is DSR ? Where is location C++ file code of http/server, http/cache, and http/client ? How do I know the NS2 code reference ? How can I get queue length? How to plot data? How do I know C++? How to solve NS2.35 installation problem “tk8.5.10 make failed!” in Linux CentOS 5.7 How to solve NS2.35 installation problem “can’t find X includes ” in Linux CentOS 5.7 How to solve NS2.35 installation problem “tclcl-1.20 make failed! ” in Linux CentOS 5.7
1. How is packet created SRPacket p; p.src = net_id; p.pkt = allocpkt(); hdr_sr *srh = hdr_sr::access(p.pkt); hdr_ip *iph = hdr_ip::access(p.pkt); hdr_cmn *cmnh = hdr_cmn::access(p.pkt); 2. What is DSR DSR is stand for Dynamic Source Routing for details see this link –> http://www.skynet.ie/~bryan/dsr_faq/ (http://www.skynet.ie/~bryan/dsr_faq/) 3. Where is location C++ file code of http/server, http/cache, and http/client ? details code in http.h , http.cc ~/ns-allinone-2.35/ns-2.35/webcache 4. How do I know the NS2 code reference ? see this link –> http://www-rp.lip6.fr/ns-doc/ns226-doc/html/hierarchy.htm (http://www-rp.lip6.fr/ns-doc/ns226-doc/html/hierarchy.htm) 5. How can I get queue length ? If you set up a router, you can then create a trace file for it… $ns duplex-link $router0 $router1 10Mb .05 DropTail set routertracefile [open routertrace.tr w] $ns trace-queue $router0 $router1 $routertracefile And after the simulation runs, you can use an awk script like this one: — #usage: #awk -f makerouterstats.awk routertrace.tr .1 #or other trace file and time increment BEGIN { drops = 0 recv = 0 numinque = 0 time = 0 packetsent = 0 timewindow = ARGV[2] ARGC = 2 } $2 > (time + timewindow) {updateTime()} $1 == “r” {rec += 1} $1 == “+” {numinque += 1} $1 == “-” {numinque += -1; packetsent+=1} $1 == “d” {drops += 1; numinque+= -1} function updateTime() { time = time + timewindow printf(“%s \t %s \t %s \t %s \t %s \n”, time, numinque, drops, recv, packetsent) rec = 0 drops = 0 packetsent = 0 } END { updateTime() } 6. How to plot data? Suppose you want to plot the file d1.dat. Try the following. #set terminal postfile (These commented lines would be used to ) #set output “d1_plot.ps” (generate a postscript file. ) set title “Energy vs. Time for Sample Data” set xlabel “Time” set ylabel “Energy” plot “d1.dat” with lines pause -1 “Hit any key to continue” This example uses the default X11 window for output. It sets the name of the plot title. Then it set the names of the x-axis and y-axis to Time and Energy (default would be X and Y). The plot command is really the key line. It plots data from a file, using column 1 and 2 as the default x and y values. The limits are set automatically, and data points are connected with lines. Some variations on the plot command are: Plot a function. To plot a function instead of a data file, try plot sin(x) with lines Plot in a specified range. To plot a data set in the range 0 < x < 10 and 0.2 < y < 0.6, try plot [0,10] [0.2,0.6] "d1.dat" with lines Plot with points. To plot with points, or to plot with lines and points, use the folloing forms plot "d1.dat" with points plot "d1.dat" with linespoints Plot different columns of datafile. For example, to take x from column 4 and y from column 2, plot "data.dat" using 4:2 with lines Plot several functions at once. To plot d1.dat against the line y(x)=exp(-x), try plot "d1.dat" with lines, exp(x) with lines Change the Plot Title. To change the name that appears in the ‘key’ in the corner of the plot, try plot "d1.dat" title 'Sample Data' with lines or, if you don’t like the key, try plot "d1.dat" notitle with lines Rainbow plot –> http://gnuplot.sourceforge.net/demo/rainbow.html (http://gnuplot.sourceforge.net/demo/rainbow.html) Another Example –> http://www2.yukawa.kyoto-u.ac.jp/~ohnishi/Lib/gnuplot.html (http://www2.yukawa.kyoto-u.ac.jp/~ohnishi/Lib/gnuplot.html) http://sparky.rice.edu/gnuplot.html (http://sparky.rice.edu/gnuplot.html) Gnuplot Demo –> http://gnuplot.sourceforge.net/demo/ (http://gnuplot.sourceforge.net/demo/) 7. How do I know C++ ? see this link http://www.cplusplus.com/doc/tutorial/ (http://www.cplusplus.com/doc/tutorial/) 8. How to solve NS2.35 installation problem “tk8.5.10 make failed!” in Linux CentOS 5.7 Requirements : # yum install \ libX11-devel libXext-devel libXau-devel libXmu-devel gcc-c++ 9. How to solve NS2.35 installation problem “can’t find X includes ” in Linux CentOS 5.7 Requirements : # yum install \ libXt-devel 10. How to solve NS2.35 installation problem “tclcl-1.20 make failed! ” in Linux CentOS 5.7 Requirements : # yum install \ gcc-c++
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