DoS or DDoS attack
- 1. DoS or DDoS Attack A red eye to Web Services Presented by... Tamal Biswas Kousik Layek Tridib Biswas
- 2. Module Index • What is DoS? • What is DDoS? • Recent attack on web. • Methods of attack. • Performing DoS attacks. • How do we know an attack is happening? • What to do if we are experiencing an attack? • How do we avoid being part of the problem? • Conclusion.
- 3. Denial of Services(DoS) Its an attack to make a machine or network resource unavailable to its intended users.
- 4. Denial of Services(DoS) Back Its an attack to make a machine or network resource unavailable to its intended users.
- 5. Distributed Denial-of-Service attack Its an attack to make a machine or network resource unavailable to its intended users by using others computer. Network Back
- 6. A big-bang of DDoS attack The internet around the whole world was slowed down on 27th march. Because that day DDoS attack took place with near about 300 Gbps. Back
- 7. Method of attack • ICMP flood • Teardrop attacks • Permanent denial-of-service attacks • Reflected / Spoofed attack • Low-rate Denial-of-Service attacks • Peer-to-peer attacks
- 8. Some best DoS attack method • ICMP flood: – Sends packets to all computer hosts rather than a specific machine. • Teardrop attacks: – Fragmented over-sized pay-loads to be send to the target machine. • Permanent denial-of-service attacks: – It may cause replacement of hardware also. Back
- 9. Performing DoS or DDoS Attack • A wide range of programs are used to launch DoS-attacks. Some of those are... Jolt Bubonic Targa Blast Panther Crazy Pinger
- 10. Some best DoS Attack tools • Jolt: – Finds exploit vulnerability in windows networking code. – Consumes 100% CPU time by sending heavy CPU consuming packets. • LaTierra: – It sends TCP packets to more than one port number. • Nemsey: – generates random packets with random port number and floods victim with it. Back
- 11. How do we know an attack is happening? • unusually slow network performance (opening files or accessing websites) • unavailability of a particular website • inability to access any website • dramatic increase in the amount of spam you receive in your account
- 12. A common message after DoS Back
- 13. What to do if we are experiencing an attack? • contact your network administrators. • In case of home computer, consider contacting your internet service provider (ISP). • Immediatly get disconnected from internet. Back
- 14. How do we avoid being part of the problem? • Install and maintain anti-virus. • Install a firewall. • Configure the firewall to restrict incomming and outgoing traffic. • Follow good security practices for distributing your email address. • Applying email filters may help you manage unwanted traffic. Back
- 15. Conclusion • Susceptibility to attacks could be alleviated with better Internet. • Don’t leave all the decision making to the machines. • Provide ‘intelligent’ support along the path. • Create “Hardened” networks.
- 17. Thank you...