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Bug 1047 - Xntpd will mis-synchronize
Summary: Xntpd will mis-synchronize
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: xntp3
Version: 5.1
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Jeff Johnson
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 1999-02-05 00:15 UTC by keybounce
Modified: 2008-05-01 15:37 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 1999-03-24 23:48:46 UTC

Attachments (Terms of Use)

Description keybounce 1999-02-05 00:15:43 UTC
Xntpd will improperly synchronize the clock.

The problem does not appear so much to be in the code, as in
one of the constants defined by the specifications -- it is
too loose.

A patch is coming.

Brief summary: Xntpd synchronzes when the "error" is less
than 1; this causes problems with all of the root clocks, as
they do not work that smoothly. Thus, they have a lot of
time steps; so do other sites that synch to them.

In addition, if you are doing a file transfer, xntpd's
concept of error will still go well below 1 during the file
transfer, and a 2-4 second error will be stepped into your

This patch lowers the treshold to .025.

I have been running this patch on xntpd-3.51 for over a year
on another machine; I have just applied it to our internal
time server today.

(yes, this really should be back-prop'd to the maintainers
of xntpd; I figured that it would be more likely to be
accepted if it had your backing as well)

Comment 1 Jeff Johnson 1999-03-24 23:48:59 UTC
Please reopen this bug with the patch. The Right Thing To Do
is to send the patch to the xntp3 crowd -- we'll be happy
to include the patch with an update of xntp3.

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