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DES-3200 Series Layer 2 Managed Fast Ethernet Switch CLI Reference Guide
224
Chapter 24
DoS Attack Prevention
Command List
config dos_prevention dos_type [{land_attack | blat_attack | tcp_null_scan | tcp_xmasscan |
tcp_synfin | tcp_syn_srcport_less_1024 | ping_death_attack | tcp_tiny_frag_attack} | all]
{action [drop] | state [enable | disable]}
show dos_prevention {land_attack | blat_attack | tcp_null_scan | tcp_xmasscan | tcp_synfin |
tcp_syn_srcport_less_1024 | ping_death_attack | tcp_tiny_frag_attack}
config dos_prevention trap [enable | disable]
config dos_prevention log [enable | disable]
24-1 config dos_prevention dos_type
Description
This command is used to configure the prevention of each Denial-of-Service (DoS) attack,
including state and action. The packet matching will be done by hardware. For a specific type of
attack, the content of the packet will be matched against a specific pattern.
Format
config dos_prevention dos_type [{land_attack | blat_attack | tcp_null_scan | tcp_xmasscan
| tcp_synfin | tcp_syn_srcport_less_1024 | ping_death_attack | tcp_tiny_frag_attack} | all]
{action [drop] | state [enable | disable]}
Parameters
land_attack - (Optional) Check whether the source address is equal to destination address of a
received IP packet.
blat_attack - (Optional) Check whether the source port is equal to destination port of a received
TCP packet.
tcp_null_scan - (Optional) Check whether a received TCP packet contains a sequence number
of 0 and no flags
tcp_xmasscan - (Optional) Check whether a received TCP packet contains URG, Push and FIN
flags.
tcp_synfin - (Optional) Check whether a received TCP packet contains FIN and SYN flags.
tcp_syn_srcport_less_1024 - (Optional) Check whether the TCP packets source ports are less
than 1024 packets.
ping_death_attack - (Optional) Detect whether received packets are fragmented ICMP packets.
tcp_tiny_frag_attack - (Optional) Check whether the packets are TCP tiny fragment packets.
all - Specify all DoS attack type.
action – (Optional) When enabling DoS prevention, the following actions can be taken.
drop – Drop DoS attack packets.
state - (Optional) Specify the DoS attack prevention state.
enable - Enable DoS attack prevention.
disable - Disabe DoS attack prevention.
Restrictions
Only Administrator, Operator and Power-User level users can issue this command.