Preventing Denial of Service Attacks
DoS attacks
- Network disrupted by a flood of messages (prevents messages from normal users)
- Flooding web servers, email servers
Distributed DoS (DDoS)
- Places DDoS agents into many computers
- Controls them by DDoS handler
- Example: Issues instructions to computers to send simultaneous messages to a target computer
Difficult to prevent DoS and DDoS attacks
- Setup many servers around the world
- Use Intrusion Detection Systems
- Require ISPs to verify that all incoming messages have valid IP addresses