一般服务器，如果做网站或者邮件，用到的基本都是TCP+DNS需要的特殊IP的53端口，其它的UDP,ICMP可以完全禁用以达到防止UDP和ICMP攻击的目的。

UDP Based

UDP Flood
Fragmentation
DNS Flood
VoIP Flood
Media Data Flood
Non-Spoofed UDP Flood

TCP Based
SYN Flood
SYN-ACK Flood
ACK & PUSH ACK Flood
Fragmented ACK
RST or FIN Flood
Synonymous Flood
Fake Session
Session Attack
Misused Application

ICMP Based
ICMP Flood
Fragmentation
Ping Flood
Fragmented ACK
RST or FIN Flood
Synonymous Flood
Fake Session
Session Attack
Misused Application