1. Open Network Connections in System->Preferences menu,select the connection Wired or Wireless which you want to configure the Google Public DNS.

2. Select your network interface in the list and click Edit,then select IPV4 Settings tab

3.If the selected method is Automatic (DHCP), open the dropdown and select Automatic (DHCP) addresses only instead. If the method is set to something else, do not change it.
Then,type the Google Public DNS IP addresses in the DNS servers area,separated by a space: 8.8.8.8 8.8.4.4
4. Click Apply and save the change.

Test that the Google DNS resolver is working:

1. From your browser, type in a hostname, such as http://www.google.com. If it resolves correctly, bookmark the page, and try accessing the page from the bookmark. If both of these tests work, everything is working correctly. If not, go to step 2.
2. From your browser, type in a fixed IP address. You can use http://18.62.1.6/ (which points to the website http://eecs.mit.edu/) as the URL*. If this works correctly, bookmark the page, and try accessing the page from the bookmark. If these tests work (but step 1 fails), then there is a problem with your DNS configuration; check the steps above to make sure you have configured everything correctly. If these tests do not work, go to step 3.
3. Roll back the DNS changes you made and run the tests again. If the tests still do not work, then there is a problem with your network settings; contact your ISP or network administrator for assistance.

The original from:http://code.google.com/intl/en/speed/public-dns/docs/using.html

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sudo apt-get install xinetd telnetd 

2.Edit /etc/inetd.conf using your favourite file editor with root permission,add this line:

telnet stream tcp nowait telnetd /usr/sbin/tcpd /usr/sbin/in.telnetd

3.Edit /etc/xinetd.conf,make its content look like following:

# Simple configuration file for xinetd
#
# Some defaults, and include /etc/xinetd.d/
defaults
{
# Please note that you need a log_type line to be able to use log_on_success
# and log_on_failure. The default is the following :
# log_type = SYSLOG daemon info
instances = 60
log_type = SYSLOG authpriv
log_on_success = HOST PID
log_on_failure = HOST
cps = 25 30
}

4.You can change telnet port number by edit /etc/services with this line:

telnet        23/tcp 

5.If you’re not satisfied with default configuration.Edit etc/xinetd.d/telnet,add following:

# default: on
# description: The telnet server serves telnet sessions; it uses
# unencrypted username/password pairs for authentication.
service telnet
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}

add these lines as you like:

only_from = 192.168.120.0/24 #Only users in 192.168.120.0 can access to
only_from = .bob.com #allow access from bob.com
no_access = 192.168.120.{101,105} #not allow access from the two IP.
access_times = 8:00-9:00 20:00-21:00 #allow access in the two times
......

6.Use this command to start telnet server:

sudo /etc/init.d/xinetd restart 

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First,open synaptic from System->Administration->Synaptic Package Manager,and navigate to Edit->Mark Packages by Task.

Check “LAMP server” in this window and click on OK.

Just so easy,test by typing 127.0.0.1 in browser address bar and you will see “it works!”.Now,you can put your php programs into /var/www/.The only thing need to do is that you should change permissions of /www directory.

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Use this command in terminal:

sudo cat /etc/mysql/debian.cnf

We can use the user and password in output to access database,and then reset root password:

# Automatically generated for Debian scripts. DO NOT TOUCH!
[client]
host     = localhost
user     = debian-sys-maint
password = IKORmdRRYQ9JHwtx
socket   = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
user     = debian-sys-maint
password = IKORmdRRYQ9JHwtx
socket   = /var/run/mysqld/mysqld.sock
basedir  = /usr

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Just run following command in terminal and all the required packages for C and C++ compilers will be installed.

sudo aptitude install build-essential

Now you can test your first C and C++ programs.

1.Type following to open mytest.c file.

sudo gedit mytest.c

Add these lines and save the file.

#include <stdio.h>

int main()

{

printf(“Hello,World!\n”);

}

Compile the code by the following command

cc -c mytest.c

Type following to create an executable

cc -o mytest mytest.c

Now you can run it by this command

./mytest

2.To run a C++ program ,first create mytest.cpp by type:

sudo gedit mytest.cpp

add this code to the file and save.

#include <iostream>

int main()

{

std::cout<<”Hello,World!”<<std::endl;

}

Then run this program by following command:

g++ mytest.cpp -o mytest

./mytest

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In fresh ubuntu,the default mirror may not the best for you.Just go to System->Administration->Software Sources

You will see this screen,select Other…at the scroll-down menu.

Click on Select Best Server.After a few seconds of testing download servers,the fastest mirror will be select automatically.

Click Choose Server,then close.A window pops up,click on Reload.

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To install LAMP in ubuntu 9.04,first install the web server Apache2:

sudo apt-get install apache2

Type this in your browser addressbar to check the installation.

http://localhost

Then install the object-oriented scripting language PHP5

sudo apt-get install php5 libapache2-mod-php5

And restart apache by following command

sudo /etc/init.d/apache2 restart

Now install the relational database management system MySQL by following command

sudo apt-get install mysql-server

Install the free software tool phpMyAdmin to handle the administration of MySQL over the World Wide Web.

sudo apt-get install phpmyadmin

A blue screen will appear during the installation,choose the apache2 and click ok.

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