Server Codes

DOS attack stands for Denial Of Service Attack.It means single attacker attacking single target. One computer and one Internet connection is used to flood the server with packets between valid and non valid request The attacker sends the large number of legitimate looking to the server in a way that the server cannot really distinguish between valid and non valid request. It will overwhelm the system to a point that the server cannot handle the capacity anymore. The point of DOS attack is overload the targeted servers bandwidth and other computer resources.This will make the server inaccessible to others. What is DDOS Attack? DDOS stands for Distributed Denial Of services Attack.It is most similar to DOS Attack, but the results are much difference. Instead of one computer and one Internet connection in normal DOS Attack. DDOS Attack utilize many computer and many connection the computer behind the such an attack are often contributed in the whole world and will be part

DNS (Domain Name Server) is an Internet service which translates domain names into IP addresses. Each time you use a domain name, DNS translates the name into the corresponding IP address Each website has IP address to brows Internet.. we cant memorize all IP addresses.  So this service mainly done by DNS server. Early day DNS use central body protocol carryout this task, Now uses Distributed protocol. Transport layer DNS use UDP port 53. BIND(Berkeley Internet Name Domain) is a free open source DNS sserver. Configuration of BIND(DNS server) Installation in DNS server on Ubuntu sudo apt-get install bind9 To setting up DNS server on your mechine through vim editor vim /etc/bind/named.conf.options forwarders { 8.8.8.8; //edit those IP addresses 8.8.4.4; 192.168.2.240; 192.168.2.241; }; After change the file hit Esc and :qw! to save the file Then open the file vim /etc/resolv.conf Change as above