A DoS attack is a Denial of service attack where a computer is used to flood a server with TCP and UDP packets and make a web resource unavailable to its users.
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Key difference between DoS and DDoS attack is that DDoS uses multiple internet connection to put the victim's network offline and DDoS attacks are executed through the use of botnets. While DoS uses a single connection and DoS attacks are generally launched through the use of a script or a DoS tool like Low Orbit Ion Cannon.
There are two general methods of DoS attacks:
Flooding services or Crashing services
Ways of DoS attacks
- Buffer Overflow
- Ping of Death or ICMP flood
- SYN flood
- Teardrop attack
Prevention of DoS attack
- Protect DNS Servers
- Deploy a DDoS protection appliance at gateway
- Configure Firewall or Router to drop incoming ICMP packets or block DNS response from outside your network (by blocking UDP port 53)
- Apply a Load balancing system to distribute traffic between servers.
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