I'm totally new to NTP. Please excuse any noob questions. What I want
is this...

I have 2 computers connected on the same lan. I want one of them to be
set up as a NTP server and the other to be setup as a NTP client. This
is my initial goal. I tried giving the ip address of the server in the
client's /etc/ntp.conf file and i gave localhost(127.0.0.1) in the
servers /etc/ntp.conf file. After this how do i go about checking if
they're even getting synchronized or anything at all? Also some links
for learning more would also be appreciated.
OS: Ubuntu Hardy Heron on both server and client.
Thanks in advance.

[demime 1.01d removed an attachment of type multipart/signed]

I thought NTP packets were the same length in both directions.

Hello,
I am interested in getting a GPS clock to synchronize our internal
test network. I am curious to hear about relativley cheap and Linux
friendly GPS clock. (Less than $100 would be great)

Thanks in advance

Hello,
I am conducting research with TDMA on a wired emulated network. I
want all of the machines in the experiment to have the same time.
Ideally, the maximum offset would be on the order of 100 micro-
seconds. The machines are connected by a 1 Gbps LAN so delay is not a
problem. Additionally, I don't care about the correctness of the clock
compared to global time. I am curious what is he best way to set this
up. I was thinking to have on dedicated ntp server that operated in
broadcast mode, and also configure the clients to poll it every 16
seconds. Additionally, there are two planes: experimental and
control. Since the experimental traffic is separated from the control
traffic, there should be little variance in delay for ntp packets.

Thanks,

Roman

A question has arisen in another group-- What happens if, when ntp starts
up, the remoter server is unavailable ( eg no DNS or no connection)?
This is highly likely to be the case for a laptop for example, where the
connection with the local network is only brought up by the user after a
while, or on wakeup from a power outage when the net may be unstable or the
router be out when ntp comes up.

If a server disappears in a running ntp, ntp keeps trying, backing off on
the poll interval after a while. But what does ntp do if on the first try
to a server, there is no response, or if the dns is down. Does it forever
scrub that server? (that seems to be what happnes-- if so why?) or does it
do the same thing as if the server disappears after a while (keep trying
with increasing poll intervals)?

I notice that there is a keyword dynamic which is not yet implimented but
which seems to imply the second option.

Also what happens to ntpd if it has no servers whatsoever, not even a local
one? Does it keep running, doing nothing, or does it exit?

Hi,

Does an NTP servers take into account it's estimated offset in serving time
to others? If I am a server and think I am 1.5 milliseconds off from true
time, will I include this in the timestamps of my ntp replies to others?

Thanks

Howard Barina

I'm trying to use ntp_adjtime() in nanokernel, but it was clear to me
that what to pass for the tick_update parameter.

nanokernel suggests that ntp_tick_adjust() to be called every tick for
precision time adjustment, so I hook ntp_tick_adjust() to the tick
interrupt function. The question I have now is what parameter to pass
to ntp_tick_adjust().

Here's the signature of ntp_tick_adjust()
void ntp_tick_adjust(struct timespec *tvp, int tick_update)

My question is what tick_update is.
On the source code that I found in nanokernel.tar.gz, I found this:
int tick_update; /* residual from adjtime()

I'm confused. Does that mean I will have to call adjtime() to give me
the residual first?

Thank you very much in advance

I hope I didn't miss an easy answer while reading the FAQ, list archive,
and other documents online. I have some systems which are separated from
their time servers by a NAT proxy. Those which are not separated seem to
work just fine but those beyond the proxy don't keep time correctly. For
example, on one of them I got this output:

# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
server-1 172.16.2.5 2 u 52 64 377 2.022 -41630. 19.566
server-2 172.16.2.5 2 u 6 64 377 2.121 -41601. 19.996

# ntpq -c as
ind assID status conf reach auth condition last_event cnt
===========================================================
1 20192 9024 yes yes none reject reachable 2
2 20193 9024 yes yes none reject reachable 2

Those time servers aren't ideal but they are beyond my control and these
are the only two I have available. The local firewall won't let me use
servers on the Internet.

Hi,

I have a problem with the NTP.
1- I am using machine where the timezone set to (GMT) Casablanca mandatory.
2- I would like to sync this machine with NTP Local Time in Norway.
3- So currently we set manually the clock on my machine to Norway local time, because if the local
Time in Norway is 10:00AM means Casablanca is 08:00AM. So thats why we have to adjust the clock on this machine manually to 10:00AM to match Norway local time.

The problem here if we sync to NTP server it will auto sync the clock back to 08:00Am. So the question Is there any way to keep the clock on that machine synced with the local Norway time even due if the timezone on that machine is (GMT) Casablanca without forcing the machine to sync 2 hours back.

Thank you very much
Regards,
Sami
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