User's Guide

SE567/SE568 Series Residential Gateway User’s Guide Configuring Advanced Features
60
• TCP FIN
An outside device can send an attack using TCP FIN. This attack never allows a data packet to finish
transmitting and brings down your system.
• TCP XMAS
An outside device can send an attack using TCP packets with all the flags set. This causes your
system to slow to a halt.
• Fragmented TCP Packet
An outside device can send an attack using fragmented packets to allow an outside user Telnet
access to a device on your network.
• Fragmented TCP Header
An outside device can send an attack using TCP packets with only a header and no payload. When
numerous packets are sent through the Gateway in this manner, your system slows and halts.
• Fragmented UDP Header
An outside device can send an attack using fragmented UDP headers to bring down a device on your
network.
• Fragmented ICMP Header
An outside device can send an attack using fragmented ICMP headers to bring down a device on your
network.
• Inconsistent UDP/IP header lengths
An outside device can send an attack using inconsistent UDP/IP headers to bring down a device on
your network.
• Inconsistent IP header lengths
An outside device can send an attack using changes in the IP header to zero the fragment offset field.
This will be treated as a complete packet when received and cause your system to halt.