In my previous post you would have read about smurf attack which is one of the method to cause DDOS attack.
Now we will see another type of attack called TCP SYN attack. Before talking about TCP SYN attack we have to know how TCP communication will be established.
When a two user need to communicate with each other through TCP connection there will be a negotiation between two system, the diagram below will explain you how it happens.
First, the client will send the SYN packet to the server and the server will reply back with SYN/ACK packets to the client and then client will reply back with the ACK packets.
Now lets see how the TCP SYN attack works, the attacker will keep on sending the SYN packets and the victim will be sending SYN ACK packets back to SYN packets. Now the attacker will not respond back to the SYN ACK, so the resources will be wasted and the bandwidth will be utilized a lot and the legitimate user will not be able to communicate with the victims system.
Now we will see another type of attack called TCP SYN attack. Before talking about TCP SYN attack we have to know how TCP communication will be established.
When a two user need to communicate with each other through TCP connection there will be a negotiation between two system, the diagram below will explain you how it happens.
First, the client will send the SYN packet to the server and the server will reply back with SYN/ACK packets to the client and then client will reply back with the ACK packets.
Now lets see how the TCP SYN attack works, the attacker will keep on sending the SYN packets and the victim will be sending SYN ACK packets back to SYN packets. Now the attacker will not respond back to the SYN ACK, so the resources will be wasted and the bandwidth will be utilized a lot and the legitimate user will not be able to communicate with the victims system.
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