Squid is used by hundreds of Internet Providers world-wide to provide their users with the best possible web access. Squid optimises the data flow between client and server to improve performance and caches frequently-used content to save bandwidth.

Squid can also route content requests to servers in a wide variety of ways to build cache server hierarchies which optimise network throughput.

Step 1. Install  Squid

apt-get install squid

Step 2. Allow your network to use the proxy server.

Append lines similar to these to your config.

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What is Crontab?

Crontab (CRON TABle)is a program that manipulates the CRON daemon, making it easy for users to schedule task and run programs/commands at pre determined periods of time.

Crontab can also be considered a file witch contains commands that will be run by the system as the user that owns the
crontab file.

What is the purpose of Crontab?

Cron is designed to maintain a list of commands that the system needs to run at a given time interval.

For example if you have a script that generates statistics and needs to be run every couple of hours or everyday cron can do it for you. Or for example if you have a script that sends a newsletter every month you can use cron to run the script that sends the newsletter every month or week.

Crontab commands

First, don’t panic! This is usually a simple matter so long as you have physical access to the console.

Simply follow the steps below to boot the system bypassing login, and then set a new password:

Step 1. Reboot the system. Make sure your physically present.

Step 2. When the Grub menu comes up, press “e” to edit the menu selections.

Step 3. Select the kernel you would usually boot and press “e” to edit the settings.

Why you need DHCP server?

DHCP is useful for fast delivery of client network configuration. When configuring the client system, the administrator can choose DHCP and not have to enter an IP address, netmask, gateway, or DNS servers. The client retrieves this information from the DHCP server.
DHCP is also useful if an administrator wants to change the IP addresses of a large number of systems. Instead of reconfiguring all the systems, he can just edit one DHCP configuration file on the server for the new set of IP address. If the DNS servers for an organization changes, the changes are made on the DHCP server, not on the DHCP clients. Once the network is restarted on the clients (or the clients are rebooted), the changes will take effect.

Step 1. Installing DHCP server

#apt-get install dhcp3-server

Once you press enter installation will start it will ask you some questions just you need to click ok for all three times

Step 2. Configuring DHCP server

The main Configuration file for DHCP server is

/etc/dhcp3/dhcpd.conf

Before doing any changes take backup copy of this file and add the following lines