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- Subject: [chrony-users] NTP bogus timestamps - Chrony on openSUSE 15.1
- From: James Knott <james.knott@xxxxxxxxxx>
- Date: Tue, 20 Aug 2019 14:11:19 -0400
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jknott-net.20150623.gappssmtp.com; s=20150623; h=from:subject:to:message-id:date:user-agent:mime-version :content-transfer-encoding; bh=ljBAvdRWEoN18clE2b+MAjMqAvF4ZfzI+onzs4UDLWU=; b=Bomd0R0hasWP+hSIA6Sh3084EAR92QfXw7n51o9FrBKVCae9rrM3UylmiF581ZbkzD 9wrMZPaqRKeCjpkcio+CmpSZ4IR8yGLsvoHYTXPNgne+FLPdB5Ih9nYSimvSnl+ufjtn SIOwzcLy63UV7bGQQwMgamX5Pzlr8LxVn3tq84xuXjzUkpRuWrMxJuAt9eMGMPcq5aCy 4wfiLhjFp8esjydy5SOuc/2+wPsyHdxvaou/L3CRJ4UsGx76xezLgtBbvpC9+6Da2i8w ZXds82Vblhgnof7/nGFhRxBWZE1phtMBFQetEhcloHFPOg8PyZfkUpYtNcC9gjXlc+Eb m5Vg==
I was just looking at some NTP packets between my openSUSE desktop
system and my firewall, which has a NTP server. I see the request
timestamps are all bogus values.
Reference ID: NULL
Reference Timestamp: Jan 1, 1970 00:00:00.000000000 UTC
Origin Timestamp: Jan 1, 1970 00:00:00.000000000 UTC
Receive Timestamp: Jan 1, 1970 00:00:00.000000000 UTC
Transmit Timestamp: Jun 23, 1983 00:21:14.440064618 UTC
However, the reply from the server shows correct values.
Reference ID: 132.246.11.238
Reference Timestamp: Aug 20, 2019 15:46:02.939010883 UTC
Origin Timestamp: Jun 23, 1983 00:21:14.440064618 UTC
Receive Timestamp: Aug 20, 2019 16:02:07.892748690 UTC
Transmit Timestamp: Aug 20, 2019 16:02:07.892798979 UTC
Why are the values from the client nonsense?
Proper NTP operation requires accurate time stamps in both directions,
to ensure accurate time. For example, the transit time is used to
determine the local offset from the server.
The packets between my pfSense firewall and the public NTP server show
correct values.
Reference ID: 132.246.11.238
Reference Timestamp: Aug 20, 2019 16:21:22.937971724 UTC
Origin Timestamp: Aug 20, 2019 16:23:07.952061086 UTC
Receive Timestamp: Aug 20, 2019 16:23:07.971987723 UTC
Transmit Timestamp: Aug 20, 2019 16:31:44.921310040 UTC
https://en.wikipedia.org/wiki/Network_Time_Protocol#Timestamps
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