Bug 1171640

Summary: NTP drops requests when sourceport is below 123
Product: Red Hat Enterprise Linux 7 Reporter: Miroslav Lichvar <mlichvar>
Component: ntpAssignee: Miroslav Lichvar <mlichvar>
Status: CLOSED ERRATA QA Contact: Jakub Prokes <jprokes>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 7.1CC: jprokes, jscotka, mosonkonrad, ovasik, pbokoc, qe-baseos-daemons
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: ntp-4.2.6p5-20.el7 Doc Type: Bug Fix
Doc Text:
The ntpd daemon dropped incoming NTP packets if their source port was lower than 123 (the NTP port). As a consequence, clients behind Network Address Translation (NAT) were unable to synchronize with the server if their source port was translated to ports below 123. With this update, ntpd no longer checks the source port number, and clients behind NAT are now able to correctly synchronize with the server.
 Story Points: ---
Clone Of: 1171630 Environment:
Last Closed: 2015-11-19 08:37:38 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1171630    
Bug Blocks:    

Comment 7 errata-xmlrpc 2015-11-19 08:37:38 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-2231.html