Types of DoS attacks
- attackers have more bandwidth than victim, e.g T3 (45Mpbs) attacks T1 (1.544 Mbps).
- attackers amplify their bandwidth engaging other computers to attack victim with higher bandwidth, e.g. 100 56Kbps attack a T1
Resource starvation: consumes system resources like CPU, memory, disk space on the victim machine.
Program flaws: exploit inability of programs to handle exceptions (vulnerabilities).
Routing and DNS attacks: manipulate routing tables
- routing protocols RIP v1 and BGP v4 have no, or weak authentication
- change routing tables to route to attacker’s net or black hole.
- attack to DNS servers, again route to attackers or black hole.
Generic attacks: like the Melissa virus which shutdown mail servers