[time] originator timestamp 1947?

J.A.C.M. Jos van de Ven jvdven
Tue Feb 6 23:30:59 UTC 2007


> > All those timestamps in the far past and future? Does this look right?
> > I didn't even show you all the packets, but it is just an example.
> 
> This is perfectly normal, it's random data that would be ignored by ntpd
> being converted to date/time by tcpdump.

Then why does my ntpd reply to those packets?


22:59:35.716438 IP (tos 0x0, ttl  56, id 53616, offset 0, flags [DF], proto
17, length: 76) pD9E77E91.dip.t-dialin.net.1071 >
535247CD.cable.casema.nl.ntp: NTPv4, length 48
        Client, Leap indicator:  (0), Stratum 0, poll 0s, precision 0
        Root Delay: 0.000000, Root dispersion: 0.000000, Reference-ID:
(unspec)
          Reference Timestamp:  0.000000000
          Originator Timestamp: 0.000000000
          Receive Timestamp:    0.000000000
          Transmit Timestamp:   2898045451.504183851 (1991/11/02 05:37:31)
            Originator - Receive Timestamp:  0.000000000
            Originator - Transmit Timestamp: 2898045451.504183851
(1991/11/02 05:37:31)
22:59:35.716762 IP (tos 0x10, ttl  64, id 60231, offset 0, flags [DF], proto
17, length: 76) 535247CD.cable.casema.nl.ntp >
pD9E77E91.dip.t-dialin.net.1071: NTPv4, length 48
        Server, Leap indicator:  (0), Stratum 2, poll 0s, precision -20
        Root Delay: 0.020019, Root dispersion: 0.038742, Reference-ID:
adsl.remco.org
          Reference Timestamp:  3379787836.248038999 (2007/02/06 22:57:16)
          Originator Timestamp: 2898045451.504183851 (1991/11/02 05:37:31)
          Receive Timestamp:    3379787975.716652999 (2007/02/06 22:59:35)
          Transmit Timestamp:   3379787975.716696999 (2007/02/06 22:59:35)
            Originator - Receive Timestamp:  +481742524.212469148
            Originator - Transmit Timestamp: +481742524.212513148

Jos





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