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Checking VPN logs can prove useful in tracking down slacking employees, but that's only if employees are forced to use the VPN consistently and if supervisors or IT monitors those logs from time to time (such as when an unauthorized connection to China materializes). If no one is bothering to force employees to use the VPN or to peruse the logs once in a while, that company has more to worry about than unproductive workers; that company is setting itself up to be hacked.
Recent article here:
Kind of common sense, but apparently to some folks, it's not:
VPN logs alone are not enough to prove that people working from home are slacking off, because connecting to the company network is not the same thing as delivering results.
I would think that since telecommuting users were on Yahoo's remote access VPN, the company would be able to see everything just as if the employee was physically in the office and on Yahoo's network. The encrypted tunnel exists between the network access server and the individual's machine, but once the data stream reaches the NAS, it has fulfilled it's task of secure transmission and should then be unencrypted. If a telecommuting employee wanted to hide their activity from their employer, they should probably not count on their employer's VPN to do it.