Dos Attack Prevention Settings - D-Link DXS-3600 Series Reference Manual

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch Web UI Reference Guide

DoS Attack Prevention Settings

This window is used to view and configure the Denial-of-Service (DoS) attack prevention settings. The
following well-known DoS types which can be detected by most switches:
•
Land Attack: This type of attack involves IP packets where the source and destination address are
set to the address of the target device. It may cause the target device to reply to itself continuously.
•
Blat Attack: This type of attack will send packets with the TCP/UDP source port equal to the
destination port of the target device. It may cause the target device to respond to itself.
•
TCP-Null: This type of attack involves port scanning by using specific packets which contain a
sequence number of 0 and no flags.
•
TCP-Xmas: This type of attack involves port scanning by using specific packets which contain a
sequence number of 0 and the Urgent (URG), Push (PSH), and FIN flags.
•
TCP SYN-FIN: This type of attack involves port scanning by using specific packets which contain
SYN and FIN flags.
•
TCP SYN SrcPort Less 1024: This type of attack involves port scanning by using specific packets
which contain source port 0 to 1023 and SYN flag.
•
Ping of Death Attack: A ping of death is a type of attack on a computer that involves sending a
malformed or otherwise a malicious ping to a computer. A ping is normally 64 bytes in size (many
computers cannot handle a ping larger than the maximum IP packet size which is 65535 bytes). The
sending of a ping of this size can crash the target computer. Traditionally, this bug has been
relatively easy to exploit. Generally, sending a 65536 byte ping packet is illegal according to
networking protocol, but a packet of such a size can be sent if it is fragmented; when the target
computer reassembles the packet, a buffer overflow can occur, which often causes a system crash.
•
TCP Tiny Fragment Attack: The Tiny TCP Fragment attacker uses IP fragmentation to create
extremely small fragments and force the TCP header information into a separate packet fragment to
pass through the check function of the router and issue an attack.
•
All Types: All of above types.
To view the following window, click Security > DoS Attack Prevention Settings, as shown below:
The fields that can be configured in SNMP Server Enable Traps DoS Settings are described below:
Figure 9-82 DoS Attack Prevention Settings Window
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