There is some good stuff here. Well, in the sense that you might want to get yourself caught up on the all the latest advisories, anyway.
There are several general categories of DoS attacks. Some groups divide attacks into three classes: bandwidth attacks, protocol attacks, and logic attacks. Following are brief descriptions of some common types of DoS attacks.
3.1 Bandwidth attacks
Bandwidth attacks are relatively straightforward attempts to consume resources, such as network bandwidth or equipment throughput. High-data-volume attacks can consume all available bandwidth between an ISP and your site. The link fills up, and legitimate traffic slows down. Timeouts may occur, causing retransmission, generating even more traffic. An attacker can consume bandwidth by transmitting any traffic at all on your network connection. A basic flood attack might use UDP or ICMP packets to simply consume all available bandwidth. For that matter, an attack could consist of TCP or raw IP packets, as long as the traffic is routed to your network. [Read the rest]