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TL-R488T Load Balance Broadband Router User Guide

Attacks. And the Router will start up the blocking function immediately.

• Port Scan - During the specific time, if a computer (identified by a particular source IP

address) transmits TCP SYN packets to another computer's (identified by a destination

IP address) ten different ports, then the source IP address will be deemed to make Port

Attacks. And the Router will start up the blocking function immediately.

• IP Deceive - If you select this option, the Router will monitor whether the packets from

the particular region is doing IP deceive. In the event, the Router will start up the blocking

function immediately. Note: The function takes effect only when the Region is LAN.

¾ DoS Attack Defence

• DoS Attack Defence - During a second, if a destination IP addresses receives many

packets and the number of these packets exceeds the prescript value, then the

destination IP will be deemed to suffering from ICMP Flood Attack. And the Router will

start up the blocking function immediately.

• UDP Flood - During a second, if a particular port of a destination IP addresses receives

many packets, and the number of these packets exceeds the prescript value, then the

Port will be deemed to suffering from UDP Flood Attack. And the Router will start up the

blocking function immediately.

• SYN Flood - During a second, if a particular port of a destination IP addresses receives

many TCP SYN packets, and the number of these packets exceeds the prescript value,

then the Port will be deemed to suffering from SYN Flood Attack. And the Router will

start up the blocking function immediately.

• Land Attack - This is an attack combining Flood attack and IP spoofing. When the

attackers send the spoof SYN datagram which including the casualty's IP address and

make it the destination and source IP address, the LAND attack happens. And the

Router will start up the blocking function immediately.

• WinNuke - WinNuke is a Dos attack for any Windows computers running in the internet.

The attackers send the TCP fragment (usually sets the emergent field to the Net BIOS'S

139 port) to the connection established computers. So the NetBIOS fragments created

and make the Windows computers collapse. And the Router will start up the blocking

function immediately.

¾ Dubious Packet Defence

• Large ICMP packet: The normal ICMP packets are very short. There normal length is

shorter than 1024 Bytes. If the ICMP packets' length is larger than 1024 Bytes, then they

will be considered as large ICMP packets. And the Router will start up the blocking

function immediately.

• TCP packet w

ithout Flag: The normal TCP packets contain flag in the packet header,

or else the packets will be considered as abnormal dubious packets. And the Router will

start up the blocking function immediately.

• TCP packet with both SYN and FIN: The TCP packets which have both SYN and FIN

settings in the packets header will be considered as abnormal TCP packets. And the

Router will start up the blocking function immediately.