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Visit our sister website :

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This is a social network for enthusiasts just like us. No Junk! Only meaningful conversations with the people who share the same enthusiasm as us.

Friday, July 31, 2009

SMURF Attack

A broadcast server is a server capable of duplicating a message and sending it to all machines present on the same network. The "smurf" technique is based on the use of broadcast servers to paralyze a network

The scenario of such an attack is as follows:

  • the attacking machine sends forged packets that contain the spoofed source address of the attacker's intended victim (i.e. providing the IP address of a target machine) to one or more broadcast servers.
  • the broadcast server passes on the request to the entire network
  • all of the network's machines send a response to the broadcast server
  • the broadcast server redirects the responses to the target machine.
As such, when the attacking machine sends a request to several broadcast servers located on different networks, all of the responses from computers on the various networks will be routed to the target machine.

Denial-of-service by SMURF

In this way the bulk of the attacker's work involves finding a list of broadcast servers and falsifying the response address in order to direct them to the target machine.

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