Something confusing to new NS2 users.

bandwidth_: bandwidth of the physical layer.
basicRate_: transmission rate for control packets such as RTS, CTS, ACK and Broadcast.
dataRate_: transmission rate for mac layer data packets.
for more:
Visit best website for ns, Kliu's website
http://www.cs.binghamton.edu/~kliu/research/ns2code/note.pdf

Easiest way to instal HP printer in Fedora

I wanted to install my HP LaserJet 8150 and HP LaserJet 2430 Network printers in Fedora. I searched in the Internet but found many complected ways to install. After spending some time on the Internet and tried myself, I found the easiest way to install. I am writing the easiest way to install these printers.
1. type in the terminal
$system-config-printer
It brings one wizard.
2. Go to Edit menu and click on + New Printer
3. Select Internet Printing Protocol (if your printer is network printer, otherwise select LPT#1)
4. Click on Next then select HP and select model name
5. Finally when it ask Device URI, then give hp:/net/HP_LaserJet_8150_Series?ip=your.printer's.IP.Address
or
hp:/net/HP_LaserJet_2430?ip=your.printer's.ip.address

replace your.printer's.ip.address with IP Address of your printer.
eg. hp:/net/HP_LaserJet_8150_Series?ip=192.168.0.0
or, hp:/net/HP_LaserJet_2430?ip=192.168.0.0
6. Print test page.
Enjoy!!

vector.tcc:452: error: expected unqualified-id before ‘(’ token

I wasted so much time to solve this problem, while compiling code in c++ in fedora 8.
Now I found out the problem. The problem was due to the not linking c++ in old version of gcc, as I installed older version of gcc.
Oh, god!! finally I found out the problem. I searched 2 days for the solution on the net.

cc: In member function ‘void std::vector<_tp,>::_M_range_insert(__gnu_cxx::__normal_iterator::_Tp_alloc_type::pointer, std::vector<_tp,> >, _ForwardIterator, _ForwardIterator, std::forward_iterator_tag)’:
/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/vector.tcc:452: error: expected unqualified-id before ‘(’ token
make: *** [diffusion3/ns/difftimer.o] Error 1
Ns make failed!

Error while loading shared libraries: libstdc++.so.5: cannot open shared object file: No such file or directory

This error comes while installing some applications in Fedora.
It comes because libstdc++.so.5 is installed in other library folders, rather than /usr/lib. If you make symbolic link to /usr/lib from the folder where libstdc++.so.5 is installed. It's solved.

Dommand

ln -s /opt/gcc33/lib/libstdc++.so.5 /usr/lib/libstdc++.so.5

Remember that in my computer /opt/gcc33 is the folder where I have installed new gcc. It can be different in your computer. Just search the libstdc++.so.5.

MSN messenger for Ubuntu and Fedora

MSN messenger or Windows Messenger or Live Messenger's alternative for Ubuntu and Fedora is AMSN messenger. It's available in the following link. Download it and give these two lines command in the terminal.
Download link:

http://sourceforge.net/projects/amsn/files/amsn/0.95/amsn_0.95-3.ubuntu.deb/download

code:

sudo apt-get -f -y install amsn
sudo dpkg -i amsn_0.95-3.ubuntu.deb 

Easiest way to install in Fedora

Click on Applications >> Add/Remove Software
Click on Search tab, and search AMSN
Click the checkbox/s for AMSN

Click apply
Done!!
Alternatively, you can do

$yum install amsn

How to install gcc-3.3 in Ubuntu 9.04

Today I tried to install gcc-3.3 in Ubuntu9.04 in my PC. I followed following steps. I found 2 patches to solve the errors in the Internet.
(NOTE: - means delete, and + means add as in Patch file)

1. Download gcc-core3.3.tar.bz2 and gcc-g++-3.3.tar.bz2
2. bzip2 -cd gcc-core3.3.tar.bz2 | tar xvf -
bzip2 -cd gcc-g++-3.3.tar.bz2 | tar xvf -
3. mkdir build
4. cd build
5. /home/xxxx/gcc/gcc-3.3/configure --prefix=/opt/gcc33 --program-suffix=33 --enable-languages=c,c++

6. If there are errors from /usr/include/bits/studio-lock.h file
then comment the /*#include */
- #include
+ /*#include */
7. If there are errors from gcc/gcc-3.3/include/obstack.h file ("/read-rtl.c:653: error: lvalue required as increment operand")
Change line#423 in gcc/gcc-3.3/include/obstack.h
- *((void **)__o->next_free)++ = ((void *)datum); \
+ *((void **)__o->next_free) = ((void *)datum);
+ __o->next_free += sizeof(void *); \
8. If there are errors from decl.c file
Apply gcc42-patch-gcc-3.3.1_gcc_cp_decl.c patch from ftp.nsysu.edu.tw/FreeBSD/FreeBSD-current/ports/palm/prc-tools/files/gcc42-patch-gcc-3.3.1_gcc_cp_decl.c
9. If there is an error "gcc/collect2.c:1779:/usr/include/bits/fcntl2.h:51: error: call to ‘__open_missing_mode’ declared"
Then, in the line number 1776 of gcc/collect2.c
- redir_handle = open (redir, O_WRONLY | O_TRUNC | O_CREAT);
+ redir_handle = open (redir, O_WRONLY | O_TRUNC | O_CREAT, 0666);
10. make
11. Follow http://www.mjmwired.net/resources/mjm-fedora-gcc.html

Few useful commands:
sudo apt-get install gcc
find /usr/bin |grep gcc
find /usr/bin |grep g++
stat /usr/bin/gcc

$ cd /usr/bin
The default gcc version
$ gcc --v

Delete the old symbolic links
$ sudo rm cpp gcc g++

Change the symbolic links to 3.3: (Find where the gcc33 is installed. In this example we installed in /opt/gcc33/bin (we gave the command while installing gcc as: --prefix=/opt/gcc33).

$sudo ln -s /opt/gcc33/bin/g++33 /usr/bin/g++
$sudo ln -s /opt/gcc33/bin/gcc33 /usr/bin/gcc
$sudo ln -s /opt/gcc33/bin/cpp33 /usr/bin/cpp

Check the default gcc version

$ gcc --v

It should show new gcc version.

How to install flash player on Opera in Ubuntu?

Easiest way to install flash player on Opera in Ubuntu.

Are you frustrating with your Opera because you cannot play Youtube videos because it ask you to install Flash player, but you can't find/install for Opera?

Here is the simple steps. It's for newbies (as I am).  NOTE: This procedure works only if Flash player is installed for Firefox. 

Step-1: Change to the hidden directory

$cd ~/.opera

Step-2: Open and edit pluginpath.ini file. Add this line at the end of the file and save the file. (Note: CLOSE OPERA WHILE EDITING pluginpath.ini FILE.)

/home/qwerty/.mozilla/plugins=1

Step-3: Open Opera. Now, it works fine.