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NTP 4.2.4p6 (Stable branch)


 
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NTP 4.2.4p6 (Stable branch)

The Network Time Protocol (NTP) is used to synchronize the time of a computer client or server to another server or reference time source, such as a radio or satellite receiver or modem. It provides client accuracies typically within a millisecond on LANs and up to a few tens of milliseconds on WANs relative to a primary server synchronized to Coordinated Universal Time (UTC) via a Global Positioning Service (GPS) receiver, for example. License: OSI Approved Changes:
This release fixes oCERT.org's CVE-2009-0021, a vulnerability affecting the OpenSSL library relating to the incorrect checking of the return value of EVP_VerifyFinal function. Credit for finding this issue goes to the Google Security Team for finding the original issue with OpenSSL, and to ocert.org for finding the problem in NTP and telling us about it. This is a recommended upgrade. Image

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NTPTRACE(1)						      General Commands Manual						       NTPTRACE(1)

NAME
ntptrace - trace a chain of NTP servers back to the primary source SYNOPSIS
ntptrace [ -n ] [ server ] DESCRIPTION
ntptrace determines where a given Network Time Protocol (NTP) server gets its time from, and follows the chain of NTP servers back to their master time source. If given no arguments, it starts with localhost. Here is an example of the output from ntptrace: % ntptrace localhost: stratum 4, offset 0.0019529, synch distance 0.144135 server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784 usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB' On each line, the fields are (left to right): the host name, the host stratum, the time offset between that host and the local host (as measured by ntptrace; this is why it is not always zero for "localhost"), the host synchronization distance, and (only for stratum-1 servers) the reference clock ID. All times are given in seconds. Note that the stratum is the server hop count to the primary source, while the synchronization distance is the estimated error relative to the primary source. These terms are precisely defined in RFC-1305. OPTIONS
-d Turns on some debugging output. -n Turns off the printing of host names; instead, host IP addresses are given. This may be useful if a nameserver is down. -r retries Sets the number of retransmission attempts for each host (default = 5). -t timeout Sets the retransmission timeout (in seconds) (default = 2). -v Prints verbose information about the NTP servers. BUGS
This program makes no attempt to improve accuracy by doing multiple samples. Network Time Protocol October 7, 2006 NTPTRACE(1)

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