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Brian Utterback, Principal Software Engineer
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> which is the difference between loopstats and peerstats for evaluating the
> drift respect a given timing source?
The peerstats file is written each time a new packet is received. Be careful,
it represents the what NTP has calculated the information to be using the data
from the eight most
since it looks like I will have to bite the bullet and
do that unless someone here can point me to the error of my ways.
Thanks.
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Brian Utterback | Principal Software Engineer
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ff=0.03usec
m_expr which is 2.99
and
n_expr which is 2.102
are not close; diff=0.03usec
m_expr which is 2.99
and
n_expr which is 2.103
are not close; diff=0.04usec
Are these something I need to worry about?
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as the reference clock or the clock
at 176.9.72.17 which has
the * infront of it?
Thanks
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> address?
The width of the field is not the problem. The refid is a field in the
packet and is only 32 bits.
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quality GPS with PPS
> can be connected to a low latency serial port or other IO connector
> on a system running with kernel PPS and NTP API support (most Unix).
> With a good sky view this keeps time within us of UTC; use a good
> GPSDO (with OCXO) supporting NTP and you can stay wit
On 1/13/2016 11:03 PM, Danny Mayer wrote:
On 1/13/2016 4:30 PM, brian utterback wrote:
I am sure this has been asked before but I can't find the answer. On a
multihomed system, is there anyway to specify which interfaces you want
multicastclient to listen on? If so, how. If not, why not? I
ttp://www.oracle.com>
Brian Utterback | Principle Software Engineer
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All working systems eventually star
e what
that event is.
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A
mail, send a message with subject or body 'help' to
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Any help would be greatly appreciated.
Regards,
T. Aoki
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between the time a
request was sent and a reply was received then what you observed is correct.
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Just to complicate things, does it really make sense to memlock on a
system with receive timestamps and no refclocks?
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shutdown.
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of changing a single constant with any degree of
certainty.
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it
is. What is the right thing to do if you have two conflicting standards?
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best of a bad lot, and depends on your
goals. There is no solution that meets all possible goals in this regard.
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. It is up to the individual OS
leap second implementers to determine the behavior they implemented,
which may or may not behave this way.
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. There are a whole bunch of
things that are right for some people and not for others. That is the
very reason that there isn't a right thing, because if there was one
right thing all the vendors would have fixed their operating systems to
do it.
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statement, perhaps as an update to
http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/NEWS as to what an admin
can do to mitigate the problem until an update can be performed and
whether or not the same CVE's apply to xntpd?
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sending packets to the NTP servers possibly forming a nasty data
loop and taking them off the error.
Just my two cents.
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On 12/21/2014 11:11 PM, brian utterback wrote:
loop and taking them off the error. Just my two cents.
Doh! air.
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having no server at all.
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On 12/3/2014 5:33 PM, William Unruh wrote:
On 2014-12-03, Jan Ceuleers jan.ceule...@computer.org wrote:
On 12/03/2014 02:58 PM, Brian Utterback wrote:
I still think that it takes four to
guarantee a majority but I don't have proof of that. Someday I will
spend some time to either prove
On 12/4/2014 12:13 PM, Miroslav Lichvar wrote:
On Thu, Dec 04, 2014 at 10:46:17AM -0500, brian utterback wrote:
I remain unconvinced. I believe that it takes three correct servers to
outvote a single falseticker, meaning that if you want to be safe
against one of your servers becoming
of that. Someday I will
spend some time to either prove or disprove it, but alas, time is
something I don't generally have extra to spend. But you are better off
with one than two from an operational standpoint.
Brian Utterback
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I believe that the number of pool servers used is determined by the
minclock and maxclock parameters.
Brian Utterback.
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that you refuse to accept that it isn't
a bug. Perhaps the better tack to take is that both sides accept it as
problematic and try to understand why and how to fix it.
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.
You still have the keys problem. Keys authenticate the NTP server to the
client. How would you manage keys?
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On 7/10/2014 9:26 AM, Paul wrote:
On Thu, Jul 10, 2014 at 9:07 AM, Brian Utterback
brian.utterb...@oracle.com wrote:
You still have the keys problem. Keys authenticate the NTP server to the
client. How would you manage keys?
Are you asking if it supports autokey? It currently doesn't
frequency and it's actual
frequency is smaller than the difference between system clock's adjusted
frequency and its actual frequency.
Brian Utterback
On 4/14/2014 9:34 AM, Charles Elliott wrote:
Ntpd on my system uses a frequency offset (according to NTP Plotter,
thank you very much) of -26
in the 2nd ed, but I don't have access to that one.
Brian Utterback
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of the eight you think are optimal. If one server is
really enough, then one out of eight is enough. If four servers are
enough, then four out of eight samples are enough.
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calculated offset of the moment was. Essentially
you went from an offset of -0.284+/-0.037 to an offset of 0.131+/-14.759
I don't think that is an improvement.
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On 2/7/2014 3:14 AM, Martin Burnicki wrote:
Harlan Stenn schrieb:
Brian Utterback writes:
I did test it and saw indications that it would be vulnerable. I don't
have exploit code so I didn't actually get an exploit going, but I saw
enough to convince me.
If xntpd responds to the mode 7
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are vulnerable, it says that all versions of *ntpd* before 4.2.7
are vulnerable.
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On 02/06/14 17:05, Dennis Ferguson wrote:
On 6 Feb, 2014, at 07:39 , Danny Mayer ma...@pdmconsulting.net wrote:
On 2/6/2014 9:26 AM, Brian Utterback wrote:
I recently received a question from a customer about CVE-201305211, the
monlist amplification attack. Specifically they asked
(delay), but I thought
that treating the first packet as a throw away would be better because
otherwise you end up with half the number of good samples in the
billboard. Anyway, nothing every came of the discussion.
Brian Utterback
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What version of Solaris were you using? If you were using Solaris 10,
then the ntptrace command is the old version that uses the ref field as
the IPv4 address of the server. Since it does not rely on control or
private packets it can work even if noquery was specified on one of
the servers in
amount of server stickiness built in to suppress clock
hopping, but it can still occur, especially if your servers reboot
frequently. Clock hopping can destabilize the frequency correction
feedback loop which in turn can lead to increasingly large clock
offsets. Not what you want.
Brian Utterback
, RES_NOQUERY.
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and it failed to get any servers. I added:
restrict source
and it still failed. I commented out the first two restrict lines and
then it worked.
Brian Utterback
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as you say, then you've got
your wish already.
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of peers?
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On 12/27/2013 11:49 AM, Rob wrote:
Brian Utterback brian.utterb...@oracle.com wrote:
On 12/27/2013 5:24 AM, Rob wrote:
What is the NTP developers position on implementation of better
rate limiting options in ntpd?
There are more and more amplification attacks against ntp servers,
similar
On 12/27/2013 5:50 PM, Jochen Bern wrote:
On 27 Dec 2013, Brian Utterback wrote:
Is a peer list really a big problem? It generally doesn't make sense to
have much beyond 10 peers. Are there really a lot of servers with a lot
of peers?
If you mean to ask whether such a setup exists at all
On 11/20/2013 4:44 AM, Rob wrote:
Brian Utterback brian.utterb...@oracle.com wrote:
On 11/19/2013 3:40 PM, Danny Mayer wrote:
You should not be using literal IP addresses of either flavor without
also setting the AI_NUMERICHOST flag otherwise it tries to do a DNS
lookup. That's poorly written
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Always code as if the guy who ends up maintaining your code will be a
violent psychopath who knows where you live. - Martin Golding
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Brian Utterback - Solaris RPE, Oracle Corporation.
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gethostbyname and inet_aton, each of which you might expect to have
different results in that case. We had people citing two RFC's and the
ipng working group mailing list. Great fun.
Brian utterback
Brian Utterback
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stack or any combination. But no matter what they
did there were edge cases that needed to work differently.
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turned on would be a good idea.
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Ph:603
On 11/12/2013 1:02 PM, Gary Johnson wrote:
On 2013-11-12, John Hasler wrote:
Brian Utterback writes:
However, it begs the question of why somebody thought that printing
M- before characters with the high order bit turned on would be a
good idea.
ASCII characters with the high bit turned
with one server, you
could swamp it. But as I said that was fixed quickly and years ago.
Brian Utterback.
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, then I think they have a right to expect
that you have done what you can to eliminate the problem yourself
including upgrading to the latest available version if possible, or at
least to take it under advisement if it is suggested to you and to
explain why you can't if it isn't possible.
Brian
of making that calculation.
Another problem is that the actual frequency usually isn't static. It
changes with the temperature among other factors. So even if you got the
kernel to use the correct value, it would still be off some of the time.
Brian Utterback
I don't understand how you get the idea that your system is
synchronizing with only one server when the messages you posted show it
synchronizing with 6 servers. Do you mean that it is synchronizing with
one server at a time? That is what it is supposed to do. There is a
combining step in the
if they
peered with one another.
Realistically, are your systems really likely to drift to 15 seconds
offset between connections? How long do they get disconnected for?
Brian Utterback
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You apparently have a cron job with a typo in it. Instead of running
ntpq each hour, it is running ntpd. Those command line arguments are for
ntpq, not ntpd.
On 6/28/2013 12:22 PM, bunty21.tiw...@gmail.com wrote:
Hi
We are using cloud based Red hat 5.5 Tikanga OS.
After installing the ntp
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There was a bug in the start up of NTP that caused it to set the
frequency before setting the first offset. This meant that the kernel
PLL treated the first offset correction as a drift in time since the
time the frequency was set (seconds before) which introduced a sudden
jerk to the loop,
the point that it is not the case that two different
servers may have different time, it is the case that they *will* have
different time. The only question is by how much. Obviously, the closer
together they are, the less the impact will be.
Brian Utterback
Peering them is a good idea, but isn't going to help, since they will
each view the other as being of a higher stratum then their upstream
servers.
On 5/24/2013 10:30 AM, Rob wrote:
Brian Utterback brian.utterb...@oracle.com wrote:
On 5/24/2013 5:27 AM, Rob wrote:
claim that 2 servers
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that. It might be an artifact of the
looping.
On 5/19/2013 5:28 AM, Joe the Shmoe wrote:
On 18/05/2013 20:10, Brian Utterback wrote:
On 5/18/2013 3:14 AM, Joe the Shmoe wrote:
[...]
This is non-intuitive and arguably incorrect according to the RFC, but
it is the programmed behavior
On 5/18/2013 3:14 AM, Joe the Shmoe wrote:
Zooming on these I see two types of requests:
- received symmetric active from unconfigured hosts, which get answered
by symmetric passive from my host. Here the point I do not understand is
that the NTP server is configured in a way to Deny packets
Golding
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is highly appreciated.
I suspect that the code in this case is not valid. It is probably set to
zero because no packet has ever been received from the server.
Please email me directly, I think I may have some information about your
issue.
Brian Utterback
br...@utterback.org
I think this is a duplicate of bug 629.
On 4/24/2013 9:54 PM, Harlan Stenn wrote:
Gary,
The short answer is I don't know. I believe we have successfully used
broadcast clients in 4.2.6.
Please see if ntp-dev works for you though - if there is a problem there
we want to fix that before
maintaining your code will be a
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the PPS.
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Brian Utterback - Solaris RPE, Oracle Corporation.
Ph:603-262-3916
the test (say by running ntpdate), but then you are
introducing a new source of error so it doesn't help you. As unruh said,
if there was a way to improve the accuracy of the measurement over the
network like that, NTP would already be doing it.
Brian Utterback
On 03/29/13 15:27, Claudio Carbone wrote:
On 29/03/13 19:26, Brian Utterback wrote:
As unruh said, if there was a way to improve the accuracy of the
measurement over the network like that, NTP would already be doing it.
If so why doesn't the offset oscillate?
If NTP were a real compensation
Okay, it can be a little obtuse, especially if you don't know the
references. The two specific references that are being used here are the
reality television show Survivor and The Byzantine Generals Problem,
an algorithm for detecting misbehaving parts of a system, in this case
an NTP server.
On 3/5/2013 11:25 PM, Abu Abdullah wrote:
On Tue, Mar 5, 2013 at 11:18 PM, Brian Utterback
brian.utterb...@oracle.com mailto:brian.utterb...@oracle.com wrote:
Based on what is being requested, I can suggest one way to
accomplish it, but it involves using an OS feature, rather than
Based on what is being requested, I can suggest one way to accomplish
it, but it involves using an OS feature, rather than using an NTP feature.
If it is feasible to run Oracle Solaris on the system in question, you
could use the Solaris Zones feature to do what you want. You could have
one
On 3/4/2013 3:20 PM, unruh wrote:
Should our stratum-2 servers all be connected to ntp1-4, or is it better to
have server1-ntp1, server2-ntp2, etc.. to make sure they don't all run off the
same clock source? i.e. should we for server1 have ntp.conf with:
If source a gives good time, why
On 2/22/2013 1:36 AM, unruh wrote:
On 2013-02-22, Brian Utterback brian.utterb...@oracle.com wrote:
On 2/21/2013 7:00 PM, unruh wrote:
Note that rmc 5322 is 2008. Many of the news readers are older than
that.
Another reason to refer to the RFC I quoted, which dates back to the 90's.
So
(for various values of too long, mostly between 60 and 80
characters or wider than your screen) then the problem is with the
reader you are using. Period. I note that the message above with the
1500 character line of text is content type text/plain with format flowed.
Brian Utterback
Having said that, I note that Ed Mischanko's mailer is not sending
text/plain flowed. So unruh has a point in that case.
On 2/21/2013 8:38 AM, Brian Utterback wrote:
Hate to get into a religious war here, but there is a hard, factual
standard here. RFC2646 which defines the MIME type text
, Brian Utterback wrote:
Having said that, I note that Ed Mischanko's mailer is not sending
text/plain flowed. So unruh has a point in that case.
On 2/21/2013 8:38 AM, Brian Utterback wrote:
Hate to get into a religious war here, but there is a hard, factual
standard here. RFC2646 which defines
On 02/21/13 14:45, E-Mail Sent to this address will be added to the
BlackLists wrote:
Brian Utterback wrote:
RFC2646
Obsoleted by RFC3676
Missed that because they changed the title. However, the new RFC doesn't
change the behavior I was referring to.
--
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Always code as if the guy
On 2/21/2013 7:00 PM, unruh wrote:
Note that rmc 5322 is 2008. Many of the news readers are older than
that.
Another reason to refer to the RFC I quoted, which dates back to the 90's.
So, it would appear that is the poster uses format=flowed test, then
your reader should handle it. But if
your code will be a
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You don't need to have the info in config 1, there is no point. If you
are not on a network then ntp doesn't have any clients and you don't
want it changing the clock.
The cleanest way to do the other two is to have two separate config
files and restart ntpd with the correct config file
On 1/9/2013 12:41 AM, Arpith Nayak wrote:
Adding my .conf file:
driftfile /tmp/ntp.drift/
server 0.pool.ntp.org
server 1.pool.ntp.org
server 2.pool.ntp.org
server 3.pool.ntp.org
Adding ntpq -p data:
[Thu Feb 10 12:55:51 root@root-ubuntu:~]# ntpq -p 0.pool.ntp.org
remote refid
will be a
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On 12/20/2012 6:25 AM, Ulf Samuelsson wrote:
Yes there is. The ntpd program has to set a timestamp in the outgoing
packet and then specify the launchtime when it writes the packet. The
goal here is to have the timestamp written in the packet exactly match
the time the packet actually hits the
On 12/18/2012 7:05 PM, Ulf Samuelsson wrote:
Brian Utterback brian.utterb...@oracle.com wrote:
On 12/13/2012 5:00 AM, Jonatan Walck wrote:
This is going to be very hard to get it to be useful. Looking at
the specs for the card, the timestamp you give is relative to a
clock that is internal
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could run into problems.
Brian
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Brian Utterback - Solaris RPE, Oracle Corporation.
Ph
On 12/19/12 16:49, Brian Utterback wrote:
Generally, the PPS signal does not go over the PCI bus. The kernel
gets its PPS signal via the serial port. You would therefore like the
controller to have its own PPS signal input, but I don't see one in
the datasheet.
So you are back to worrying
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On 12/13/2012 5:00 AM, Jonatan Walck wrote:
This is going to be very hard to get it to be useful. Looking at
the specs for the card, the timestamp you give is relative to a
clock that is internal to the controller, and is only accurate to
the nearest second. That is, it is like the PPS in that
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