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On 2012-04-21T18:34:44+00:00 Jason-bugzilla wrote:

Per Dave Hart, I'm filing this bug report to track an issue where NTP
client packets on the inside of a Cisco IOS NAT box are dropped by ntpd
on the outside of the Cisco IOS NAT box.  This is due to IOS NAT using a
low UDP source port ntp_proto.c tests against and blocks.

This was worked around per David's suggestion in the thread below, but
it would be great if this would make it into mainline code.

http://groups.google.com/group/comp.protocols.time.ntp/msg/3024d073b914b278

Reply at:
https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/1479652/comments/0

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On 2012-04-25T04:12:32+00:00 Dave Hart wrote:

Ready in ~hart/ntp-dev-2174

Reply at:
https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/1479652/comments/1

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On 2012-04-25T05:13:35+00:00 Stenn wrote:

Jason,

Thanks for the report.  Please check ntp-4.2.7p274 and mark this bug as
VERIFIED or REOPENED, as appropriate.

Dave, thanks for your work on this.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/1479652/comments/2


** Changed in: ntp
       Status: Unknown => Fix Released

** Changed in: ntp
   Importance: Unknown => High

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https://bugs.launchpad.net/bugs/1479652

Title:
  [patch] ntpd rejects source UDP ports less than 123 as bogus

Status in NTP:
  Fix Released
Status in ntp package in Ubuntu:
  New
Status in ntp package in Debian:
  Unknown

Bug description:
  [Title copied from Debian bug, which was not filed by me. Description
  below is mine.]

  If an NTP client sends a request with a source port less than 123, the
  packet is silently ignored by ntpd. This is occurring in our
  environment due to NAT.

  Attached is the patch already accepted upstream which fixes the issue.
  I've verified it fixes the problem. Debian has been ignoring this
  patch for almost 3 years. Can we get this in Ubuntu please?

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