Specifications

314
Security Type:
Select Security Type for the port.
• Disable:
Select this option to disable the IP Source Guard
feature for the port.
• SIP:
Only the packets with its source IP address and port
number matched to the IP-
MAC binding rules can be
processed.
• SIP+MAC:
Only the packets with its source IP address,
source MAC address and port number matched to the
IP-MAC binding rules can be processed.
LAG:
Displays the LAG to which the port belongs to.
14.5 DoS Defend
DoS (Denial of Service) Attack is to occupy the network bandwidth maliciously by the network
attackers or the evil programs sending a lot of service requests to the Host, which incurs an
abnormal service or even breakdown of the network.
With DoS Defend function enabled, the switch can analyze the specific fields of the IP packets and
distinguish the malicious DoS attack packets. Upon detecting the packets, the switch will discard
the illegal packets directly and limit the transmission rate of the legal packets if the over legal
packets may incur a breakdown of the network. The switch can defend several types of DoS attack
listed in the following table.
DoS Attack Type Description
Land Attack
The attacker sends a specific fake SYN packet to the destination Host.
Since both the source IP address and the destination IP address of the
SYN packet are set to be the IP address of the Host, the Host will be
trapped in an endless circle for building the initial connection. The
performance of the network will be reduced extremely.
Scan SYNFIN The attacker sends
the packet with its SYN field and the FIN field set to
1. The SYN field is used to request initial connection whereas the FIN
field is used to request disconnection. Therefore, the packet of this
type is illegal. The switch can defend this type of illegal packet.
Xmascan
The attacker sends the illegal packet with its TCP index, FIN, URG and
PSH field set to 1.
NULL Scan Attack
The attacker sends the illegal packet with its TCP index and all the
control fields set to 0. During the TCP connection and data
t
ransmission, the packets with all the control fields set to 0 are
considered as the illegal packets.
SYN packet with its
source port less than
1024
The attacker sends the illegal packet with its TCP SYN field set to 1
and source port less than 1024.
Blat Attack
The attacker sends the illegal packet with its source port and
destination port on Layer 4 the same and its URG field set to 1. Similar
to the Land Attack, the system performance of the attacked Host is
reduced since the Host circularly attempts to
build a connection with
the attacker.