Preventing ntpd from adjusting time (backwards)

[Chuck Swiger]

On Apr 21, 2009, at 11:23 AM, Mel Flynn wrote:
> Now I'm also wondering how ntpd handles securelevel 2.

"man init" suggests that stepping the clock by more than a second is  
disallowed:

    2     Highly secure mode - same as secure mode, plus disks may not  
be
          opened for writing (except by mount(2)) whether mounted or  
not.
          This level precludes tampering with file systems by unmounting
          them, but also inhibits running newfs(8) while the system is  
multi-
          user.

          In addition, kernel time changes are restricted to less than  
or
          equal to one second.  Attempts to change the time by more  
than this
          will log the message ``Time adjustment clamped to +1 second''.

Regards,
-- 
-Chuck