nanog mailing list archives

Re: REMINDER: LEAP SECOND


From: shawn wilson <ag4ve.us () gmail com>
Date: Tue, 23 Jun 2015 13:23:04 -0400

On Jun 23, 2015 6:26 AM, "Nick Hilliard" <nick () foobar org> wrote:



Blocking NTP at the NTP edge will probably work fine for most situations.
Bear in mind that your NTP edge is not necessarily the same as your
network
edge.  E.g. you might have internal GPS / radio sources which could
unexpectedly inject the leap second.  The larger the network, the more
likely this is to happen.  Most organisations have network fossils and ntp
is an excellent source of these.  I.e. systems which work away for years
without any problems before one day accidentally triggering meltdown
because some developer didn't understand the subtleties of clock
monotonicity.


NTP causes jumps - not skews, right?


Current thread: