Cyclades 2.3.0 Manuale Utente

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Virtual Private Networking allows local area networks to 

communicate across wide area networks, typically over an 
encrypted channel. See also: IPsec.

A watchdog timer (WDT) is a device or electronic card that 

performs a specific operation after a certain period of time if 
something goes wrong with an electronic system and the 
system does not recover on its own. 

A common problem is for a machine or operating system to 

lock up if two parts or programs conflict, or, in an operating 
system, if memory management trouble occurs. In some 
cases, the system will eventually recover on its own, but this 
may take an unknown and perhaps extended length of time. 

A watchdog timer can be programmed to perform a warm 

boot (restarting the system) after a certain number of seconds 
during which a program or computer fails to respond 

following the most recent mouse click or keyboard action. 

The timer can also be used for other purposes, for example, to 

actuate the refresh (or reload) button in a Web browser if a 
Web site does not fully load after a certain length of time 
following the entry of a Uniform Resource Locator (URL).