Iptables linux Anti-DOS/DDOS ?

 #echo "Block TCP-CONNECT scan attempts (SYN bit packets)"

 #echo "Block TCP-SYN scan attempts (only SYN bit packets)"


 #echo "Block TCP-FIN scan attempts (only FIN bit packets)"


 #echo "Block TCP-ACK scan attempts (only ACK bit packets)"


 #echo "Block TCP-NULL scan attempts (packets without flag)"


 #echo "Block "Christmas Tree" TCP-XMAS scan attempts (packets with FIN, URG, PSH bits)"


 #echo "Block DOS - Ping of Death"


 #echo "Block DOS - Teardrop"


 #echo "Block DDOS - SYN-flood"


 #echo "Block DDOS - Smurf"


 #echo "Block DDOS - UDP-flood (Pepsi)"


 #echo "Block DDOS - SMBnuke"

 #echo "Block DDOS - Connection-flood"


 #echo "Block DDOS - Fraggle"


 #echo "Block DDOS - Jolt"