DDOS( Distributed Denial of Services) Attack and its Removal

In this paper we have discussed about what is DDOS the latest kind of threat to various important servers in an enterprise and how to remove it. DDOS is a kind of complex attack from anywhere else mainly from internet so that a network, a server, group of servers can be made halted. In this way the business of an enterprise can be easily targeted. We have performed a lot of work on all the network services by carrying out a lot of study on all these services after their configuration, testing, security, firewalling them, their network diagnostic, their network statistics, search of free open source tools to find attacks, types of attacks, TCP/IP attacks, various kinds of TCP/IP attacks, developments of network scripts to stop these attacks. Our work mainly focuss on the above study analysis of a network for services like SMTP, FTP, POP, IMAP, DNS, HTTP, databases, domain services etc and the security, and the attacks on these services and their removal. In-built firewalls, free open source firewalls can be safely used to prevent these attacks.