22/08/2005

Vispa Internet Suffers DOS Attack

Vispa Internet Suffers DOS Attack

Stopping Denial of Service (DoS) or DDoS (Distributed DoS) attacks can be very difficult, especially for larger providers who have to check traffic at multiple entry points into their network and coordinate checks with other entry points to ensure that it really is a DoS attack, not just heavy traffic i.e. say there's a popular website (linked to a TV show) traffic may be negligable but when the show goes on air (or just after) traffic to the site increases by magnitudes. That can easily look like a DoS attack.

Once the DoS attack is detected, it can be even harder to stop as traffic will still be entering the network and even if it can be stopped at the edge (or upstream provider) the loading on the network boxes increases dramatically.

There are commercial systems out there which are designed specifically to monitor and sensibly block DoS attacks but they tend to be extremely expensive to implement. However many commercial sites who are prone to be the recipients are starting to demand DoS protection as part of their hosting services.
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