Denial-of-Service (DDoS)
attack Increase at risk cyberspace Nepal
Today
most attack Denial-of-service (DDoS) attack Cyberspace Nepal
different type of country attack
Nepal web server and network the intelligence system that can detect 85 % of cyber-attacks
larger level (DDoS) attacking
Most
routers have rules in the configuration table that won't allow millions of
requests from the same sending address. If too many requests from one address
are received in a short period of time, the router simply discards them without
forwarding. The people responsible for the attacks knew this, so they illicitly
planted programs on many different computers. These programs, when triggered,
began sending thousands of requests a minute to one or more Web sites. The
programs "spoofed" the IP address of the sender, placing a different
false IP address on each packet so that the routers' security rules wouldn't be
triggered.
When
the packet floods were triggered,
millions of requests for information began to hit the targeted Web sites. While
the servers were being heavily taxed by the requests, the real impact was to
the routers just "upstream" from the servers. Suddenly these routers,
which were robust but of a size appropriate for normal traffic, were getting the
levels of requests normally, associated with Internet backbone routers.
They couldn't handle the massive number of packets, and began discarding packets and sending status messages to other routers stating that the connection was full. As these messages cascaded through the routers leading to attacked servers, all paths to the servers were clogged, legitimate traffic couldn't get through the logjam, and the attackers' goals were accomplished.
They couldn't handle the massive number of packets, and began discarding packets and sending status messages to other routers stating that the connection was full. As these messages cascaded through the routers leading to attacked servers, all paths to the servers were clogged, legitimate traffic couldn't get through the logjam, and the attackers' goals were accomplished.