摘要:A
s we are constantly reminded, the Internet can be a very hostile
place, and public services are placed under constant pressure
from a stream of probe traffc, attempting to exploit any one
of numerous vulnerabilities that may be present at the server. In addi-
tion, there is the threat of Denial of Service (DoS)
[1]
attacks, where a
service is subjected to an abnormally high traffc load that attempts
to saturate and take it down. This story starts with the detection of a
possible hostile DoS attack on Domain Name System (DNS) servers,
and narrates the investigation as to the cause of the incident, and the
wider implications of what was found in this investigation.