[ntp:security] Regrading NTP Leap Smear

Danny Mayer mayer at ntp.org
Mon Nov 28 04:55:20 UTC 2016


The security mailing list is not the proper forum for this since this is
a question and not a security issue. Please use either the questions or
the hackers mailing lists for your question.

Danny

On 11/27/2016 12:13 PM, ashish jaiswal wrote:
> Hi ,
> 
> i am testing leapsmear time in ntp4.2.8p8.
> 
> I Â have configured the 3 server( server A,server B and C) to test the
> leap smear in ntp.
> 
> 
> server A as Strata 1 Â  leapfile defined
> 
> Server B as Strata 2 Â  leapsmearinterval 1day
> 
> Server C as Strata 3 Â  nothing special
> 
> 
> *Configure server A(test01)*
> =================
> ntp.conf 
> -------
> 
> server 127.127.1.1
> fudge  127.127.1.1 stratum 1   
> leapfile /var/tmp/leapit
> 
> --------------------
> 
> *Configure server B(test02)*
> =================
> ntp.conf
> --------
> server test01 Â  Â  Â  Â  Â  Â  Â  Â  Â  Â /
> #leapfile /var/tmp/leapit
> leapsmearinterval  86400
> 
> 
> 
> *configure Server C(test03)*
> =========================
> ntp.conf
> -------------
> server test02
> 
> 
> 
> I have run the test for 1 day to get the time log messgae and result are
> as mention below:
> 
> On server A(test01) we have 1 step back at leap second:
> 
> 1483228801.295777000
> 1483228801.495777000
> *<1483228800.534392000* <-------we have 1 step back at leap second
> !!1483228800.692505000
> 1483228800.892504000
> 1483228801.092504000
> 
> 
> On Server B(test02)we have 1 step back, then step forward ( I saw once a
> step forward then step back)
> 
> 1483228801.731879000
> 1483228801.931879000
> *<1483228800.961903000* Â <------ Â glitch , 1 step back
> !!1483228801.131879000
> 1483228801.331880000
> 1483228801.531879000
> 
> 
> 
> On Server C(test03) we don’t see glitch,
> 
> 
> the ntpd of Server C(test03) don't have glitch  but Server B has the
> glitch ( 1 step back).
> 
> 
> 
> if the server B have a glitch ( 1 step back) , *why sever C don't have
> glitch too* ?
> 
> 
> 
> please let me know if anything wrong with my configuration.
> 
> 
> Thanks and Regards
> Â 
> Ashish Jaiswal
> 
> 
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