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D-Link DGS-1100 Series Switch User Manual
76
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.
All Types:
All of above types.
To view the following window, click
Security > DoS Attack Prevention Settings
, as shown below:
Figure 9- 4 DoS Attack Prevention Settings window
The fields that can be configured for
DoS Attack Prevention Settings
are described below:
Parameter
Description
DoS Type Selection
Tick the DoS type option that will be prevented here.
State
Select to enable or disable the DoS attack prevention
feature’s global state here.
Action
Select the action that will be taken when the DoS attack was
detected here. The only option to select here is
Drop
.
Характеристики
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