One, the concept of DDoS
Want to understand the concept of DDoS, we must introduce DoS first (decline a service) , the English full name of DoS is Denial Of Service, namely the meaning that “ rejects to serve ” . All sorts of methods that atttack from the network and the destruction that produce in light of the circumstance, doS is a kind very simple but very efficient aggression way. Its purpose rejects your service to visit namely, those who destroy an organization is normal move, final it can make your partial Internet join and network system invalidation. The attack means of DoS has a lot of kinds, the basiccest DoS is atttacked even if use reasonable service to request to take up overmuch service resource, make lawful user cannot get a service thereby.
The basic course that DoS atttacks: The person that cast the first stone sends the numerous request that contains false address to the server, after the server sends reply message, wait to answer send message, because the address is forged, so server the message that waits for less than answering to pass all the time, allocate the resource that requests this to was not released from beginning to end. After the server awaits proper time, because exceed from time to time to be cut off,join is met, aggressor can convey once more a batch of new requests, below the case that sends bogus address request repeatedly in this kind, server resource is met finally by extinct.
DDoS (distributed decline a service) , its English full name is Distributed Denial Of Service, the rejection that it is a kind of special form that is based on DoS serves attack, it is one kind distributings, massive charge means of cooperation, basically aim at bigger site, resemble commercial company, search the site of engine and government sector. From the graph 1 we can see DoS attack wants a stand-alone and a Modem to be able to come true only, what differ to it is DDoS attack is to use a batch to suffer pilot machine to launch attack to a machine, the attack with such swift and violent the force with which sth breaks out makes a person guard against hard, because this is had bigger ruinous. The attack principle of DDoS is shown 2 times like the graph.
DDoS atttacks cent to be 3: Aggressor, advocate dominate end, representative end, 3 person different role is being acted in attack.
1, aggressor: The computer that aggressor place uses is attack advocate control a station, can be an any lead plane on the network, can be the portable machine of an activity even. Aggressor operates whole attack process, it to advocate accuse end to send attack order.
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