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Re: DoS Attackers using only udp and icmp protocol?

from [krymson] Network Security [Permanent Link]
Subject: Re: DoS Attackers using only udp and icmp protocol?
Date: 9 Feb 2007 20:15:50 -0000 
TCP DoS attacks are quite common, especially SYN floods. Because systems 
listening on TCP for the 3-way handshake have a time-out while they wait for 
the completion of the handshake after a SYN is first received, you can exhaust 
resources on the system be flooding lots of SYNs and just not completing the 
handshake. You could even complete the handshake and flood that way as well.

I will throw an opinion out that might be wrong, but I feel TCP-related floods 
tend to be aimed at exhausting TCP-listening resources on a target. UDP and 
ICMP floods tend to also target saturation of the target's network bandwidth.


<- snip ->

I have monitored that some DoS attack which generates large bps(over 1Gbps) 
against my network.
and I can see that all dos related packets are udp and icmp not tcp.

In the point of view attacker, 
Is it impossible that generates lots of packets and large packets using tcp 
without 3 way handshake?
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