What's going on with NTP?

Olivier Cochard-Labbé olivier at cochard.me
Thu Dec 26 09:23:12 UTC 2013


On Wed, Dec 25, 2013 at 5:35 PM, John Levine <johnl at iecc.com> wrote:

> I have two FreeBSD servers where the NTP daemons are using double digit CPU
> percentages today rather than the usual 0.01%.  Restarting them didn't
> help.
>
> The clock on my Android phone is five hours slow.  (It's not the time zone,
> I checked that.)
>
> Is this just my special Christmas present, or are there screwed up NTP
> servers?
>

The old NTP server in FreeBSD have a bug that allow to use it for reflexion
DOS attacks:

http://lists.freebsd.org/pipermail/freebsd-current/2013-November/046822.html

Regards,

Olivier


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