In a computer network, in particular for IRC (Internet Relay Chat), the English term netsplit (sometimes netburst ) indicates a disconnection of a node of the network to which it was connected as a preliminary. It is in French a cut of connection .
The diagram below represents a computer network.
Each feature represents a connection established between two nodes; each node represents either a waiter, or a user on the network. Thus, the waiter C is connected directly to the waiter has which is also connected to the waiters B and D .
If an interruption occurs in connection between C and has , connection could be finished. That can be caused by an error occurring on the socket (access point to a connection TCP) of the waiter or by a lag (or time) excessive by which the distant waiter has the rupture (timeout) anticipates.
When connection between has and C is stopped, the users connected to the waiters which are not accessible any more on the network give the impression to have disappeared. For example, if the user Sara is connected to the waiter has , Bob with the waiter B and Bar with the waiter C , and that C and has are disconnected, it will seem with Sara and Bob that Joe left the network whereas it seems with Joe that Sara and Bob left the network. That arrives because the waiters to which they are connected are informed of the change of the network and update their local information to announce these changes.
Later, the waiters C and has will be able reconnecter and the users who seemed to have disappeared from the network (either of the network of the users of the waiter C , or of the network of the users of the other waiters) will reappear. The process of sending of this update of information to all the waiters is called a netburst (gust of reconnexion).
A netsplit can be used to carry out an attack leading to a Takeover or takeover of the channel. In this case, the attacker clone under the name of the user whom he wants to disconnect and when the netburst occurs the 2 users are disconnected. It is ineffective in networks IRC where the services exist.
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