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== Approaches ==
* '''virtualization on the 2nd level (OpenVZ)''';
: For input packets context switching is performed in device xmit code, requires virtual device for performing. For output, context is inherited from socket one.
* '''virtualization on the 3d level (IBM)''';
: For input packets context switching is performed in routing code, for output - inherited from socket one.
* '''socket virtualization (Linux-VServer)'''.
: There is no context switching for packets at all, checks are performed between process and socket contexts.
