DOS attack
SANOJ<MU10co13>
WHAT IS DOS ATTACK??
Denial of service :It is a malicious attempt by a single person or a group of people to cause the victim, site or node to deny service to it customers.
DOS: when a single host attacksDDOS: when a multiple host attacks simultaneously.
What are the effects?
Bandwidth : network congestion
CPU time : make someone do expensive and complex calculation.
Memory : tie up system state
Symptoms of DOS attack Unusually slow network performance Unavailability of a particular website Inability to access any website Dramatic increase in spam email
received(email bomb) Disconnection of a wireless or wired
internet connection
Attack classification
DOS attack can be classified into three categories : Bandwidth/throughput attacks Protocol attacks Software vulnerability attacks
Bandwidth attacks
Leads to the problem in the “network branches”around the actual computer being attacked Ping Flood attack (ICMP echo) SYN Flood attack (DOS attack) DDOS attack (distributed DOS) UDP Flood attacks
SYN Flood attacks
Protocol attacks
These kind of attacks are carried out by using spoofed IP address
Smurf attack DNS name server attack
Smurf attacks
Packets are sent to all hosts using the broadcast address of the network
Software vulnerability attack
This attacks leads to the system crashesTypes are :- Land attack Ping to death attack Fragmentation attack and teardrop
attack
Damage and costs
The impact of DOS attack :
Hidden costs Bandwidth wastage Logging cost Extra network channel Insurance and bandwidth cost
Handling of DOS
We cannot stop DOS attack but we can reduce it by using Firewalls Switches Routers DDS based defense Clean pipes
thank you
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