nanog mailing list archives
Re: Leap second tonight
From: "Kevin Oberman" <oberman () es net>
Date: Wed, 31 Dec 2008 15:28:16 -0800
From: Kevin Day <toasty () dragondata com> Date: Wed, 31 Dec 2008 16:41:39 -0600 Just a reminder that there's a leap second tonight. Last time I watched for what happened on 01/01/2006, there was a little bit of chaos: http://markmail.org/message/cpoj3jw5onzhhjkr?q=%22kevin+day%22+leap+second+reminder+nanog&page=1&refer=cnkxb3iv7sls5axu I've been told that some of the causes of these problems are fixed on any reasonably recent ntp distribution, but just in case, you might wanna keep an eye out if you're seeing any weirdness. The worst damage I'd heard from anyone after that event was their clock being significantly off for several hours.
While I hope people are not still running NTP versions too old to handle leap seconds correctly, but that is only a small part of the problem. If the stratum 1 reference clocks don't handle leap seconds correctly, there is no way for NTP to deal with it. We use CDMA clocks and last leap second it took weeks for all of the cell sites to adjust the last one. As a result, I have set all of our clocks for manual leap second and set them to adjust tonight at midnight (UTC).I'll take a look in about 35 minutes and see how it worked. I've heard reports of various GPS clocks not dealing with the leap second correctly, as well. Fortunately, not too many need this sort of accuracy, but those of us who do need to be prepared. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman () es net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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Current thread:
- Leap second tonight Kevin Day (Dec 31)
- Re: Leap second tonight Jasper Bryant-Greene (Dec 31)
- Re: Leap second tonight Majdi S. Abbas (Dec 31)
- Re: Leap second tonight Kevin Oberman (Dec 31)
- RE: Leap second tonight Matthew Huff (Dec 31)
- <Possible follow-ups>
- Re: Leap second tonight Peter Lothberg (Dec 31)
- Re: Leap second tonight Peter Lothberg (Dec 31)
- Re: Leap second tonight Michael Hallgren (Dec 31)
- Re: Leap second tonight Wil Schultz (Dec 31)
- Re: Leap second tonight Jon Meek (Dec 31)
- Re: Leap second tonight Steven M. Bellovin (Dec 31)