61D-Link DSL-226 User Manual
Section 4 - Conguration
Features
Firewall
The router’s rewall protects your network from malicious attacks over the
Internet. To access this page, go to Features > Firewall. It is recommended to
leave all values at their default Enable setting.
Firewall
Enable DOS
and Portscan
Protection:
Denial of Service (DoS) protection prevents attacks such as Ping of
Death and others as the following described.
SYN/TCP reset
attack:
TCP reset breaks the three-way TCP connection between two parties
by sending a spoofed RST packet.
SYN/RST attack:
SYN/RST attack sends continuous SYN packets to a targeted network
device, causing the device to spawn a half-open connection by
sending back a TCP SYN-ACK packet (Acknowledge) and waiting for
a packet in response from the sender address (response to the ACK
packet).
SYN/FIN attack:
This type of Denial of Service attacks a targeted device by continuously
sending illegitimate SYN-FIN packets.
Ping/Ping of
Death attack:
The Ping of Death attack aims to disrupt a targeted network device
by sending abnormally large packets.
FIN/URG/PSH
attack:
A URG-ACK-PSH-FIN ood attack brings down a device by sending
illegitimate URG-ACK-PSH-FIN packets.
Xmas attack:
Christmas tree attack sends crafted TCP packet to obtain information
about the target system.
Null scanning
attack:
In Null Scanning attack, a packet without any ags of the TCP header
tries to exploit a system.
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