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RFC 2030, "Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI", October 1996

Note: This RFC has been obsoleted by RFC 4330

Source of RFC: Legacy
Area Assignment: int

Errata ID: 515
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT

Reported By: vijeeshep
Date Reported: 2005-12-16
Held for Document Update by: Brian Haberman

Section 5 says:

T  = ((T2 - T1) + (T3 - T4)) / 2.

It should say:

T  = ((T2 - T1) + (T4 - T3)) / 2.

Notes:

Because T4 always will be greater than (or equal to) T3

For example assume
T1 = 1
T2 = 3
T3 = 4
T4 = 6
Case 1: As per the given formula the local clock offset will be
T = ((3 - 1) + (4 - 6)) / 2 = 0 which is wrong
Case 2: As per the corrected formula the local clock offset will be
T = ((3 - 1)+ (6 - 4)) / 2 = 2 which is correct

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