TP-Link T1600G-18TSTL-SG2216 T1600G-18TSUN V1 CLI Reference Guide Guide - Page 110

Enable the DoS Defend Type named Land attack

Page 110 highlights

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 of building the initial connection. 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. xma-scan --The attacker sends the illegal packet with its TCP index, FIN, URG and PSH field set to 1. null-scan --The attacker sends the illegal packet with its TCP index and all the control fields set to 0. During the TCP connection and data transmission, the packets with all control fields set to 0 are considered illegal. port-less-1024 --The attacker sends the illegal packet with its TCP SYN field set to 1 and source port smaller than 1024. blat --The attacker sends the illegal packet with the same source port and destination port on Layer 4 and with its URG field set to 1. Similar to the Land Attack, the system performance of the attacked host is reduced because the Host circularly attempts to build a connection with the attacker. ping-flood --The attacker floods the destination system with Ping packets, creating a broadcast storm that makes it impossible for the system to respond to legal communication. syn-flood --The attacker uses a fake IP address to send TCP request packets to the server. Upon receiving the request packets, the server responds with SYN-ACK packets. Since the IP address is fake, no response will be returned. The server will keep on sending SYN-ACK packets. If the attacker sends overflowing fake request packets, the network resource will be occupied maliciously and the requests of the legal clients will be denied. win-nuke --Because the Operation System with bugs cannot correctly process the URG (Urgent Pointer) of TCP packets, the attacker sends this type of packets to the TCP port139 (NetBIOS) of the host with the Operation System bugs, which will cause the host with a blue screen. Command Mode Global Configuration Mode Privilege Requirement Only Admin, Operator and Power User level users have access to these commands. Example Enable the DoS Defend Type named Land attack: 93

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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 of building the initial connection.
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.
xma-scan ——The attacker sends the illegal packet with its TCP index, FIN,
URG and PSH field set to 1.
null-scan ——The attacker sends the illegal packet with its TCP index and all
the control fields set to 0. During the TCP connection and data transmission,
the packets with all control fields set to 0 are considered illegal.
port-less-1024 ——The attacker sends the illegal packet with its TCP SYN
field set to 1 and source port smaller than 1024.
blat ——The attacker sends the illegal packet with the same source port and
destination port on Layer 4 and with its URG field set to 1. Similar to the Land
Attack, the system performance of the attacked host is reduced because the
Host circularly attempts to build a connection with the attacker.
ping-flood ——The attacker floods the destination system with Ping packets,
creating a broadcast storm that makes it impossible for the system to
respond to legal communication.
syn-flood ——The attacker uses a fake IP address to send TCP request
packets to the server. Upon receiving the request packets, the server
responds with SYN-ACK packets. Since the IP address is fake, no response
will be returned. The server will keep on sending SYN-ACK packets. If the
attacker sends overflowing fake request packets, the network resource will
be occupied maliciously and the requests of the legal clients will be denied.
win-nuke ——Because the Operation System with bugs cannot correctly
process the URG (Urgent Pointer) of TCP packets, the attacker sends this
type of packets to the TCP port139 (NetBIOS) of the host with the Operation
System bugs, which will cause the host with a blue screen
.
Command Mode
Global Configuration Mode
Privilege Requirement
Only Admin, Operator and Power User level users have access to these
commands.
Example
Enable the DoS Defend Type named Land attack:
93