It is possible to configure Linux box (1Mb RAM) with 6000 client threads in
Worker model. It is limited only by amout of available RAM. I used such
configuration in production, 6 Apache servers sustained 75000 of concurrent
users performing 1 request per minute, 4kb HTML pages, load/stress tests by
Compuware.
Default installation of Apache Web Server has 150 client threads allowed;
What does it mean for us? One shared TCP transport connection per Web Server,
one instance of Client Thread on Apache. It is impossible to overload Apache
using single TCP connection and performing 100 requests per second; another 149
Threads will successfully handle client requests.
Such proposed behavior of a Search Engine should not be considered as Denial of
Service Attack; we are using single TCP connection for multiple requests.
# A denial of service (DoS) attack floods a network with an overwhelming
amount of traffic, slowing its response time for legitimate traffic or
grinding it to a halt completely. The more common attacks use built-in
“features” of the TCP/IP protocol to create exponential amounts of
network traffic.
www.techdirectcomputers.com/Encyclopedia.htm
# A denial-of-service attack (also, DoS attack) is an attack on a
computer system or network that causes a loss of service to users,
typically the loss of network connectivity and services by consuming the
bandwidth of the victim network or overloading the computational
resources of the victim system.
en.wikipedia.org/wiki/DDoS
For more, type "define: DDOS" on google.com
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