Microsoft Windows [Version 6.0.6001] (C) Copyright 2006 Microsoft Corp. c:\windows>netsh ras diagnostics set tracefacilities ?
set tracefacilities [ state = ] ENABLED|DISABLED|CLEAR
Enables, disables, or clears extended tracing logs for all network connections.
state - - tracing state of the RAS components
ENABLED - Enables all available logging functions for all network connections.
DISABLED - Disables all available logging functions for all network connections.
CLEAR - Clears all extended tracing log files.