[ntp:questions] ntpq authentication problem

William Unruh unruh at invalid.ca
Sun Mar 1 17:34:56 UTC 2015


On 2015-03-01, catherine.wei1989 at gmail.com <catherine.wei1989 at gmail.com> wrote:
> On Saturday, February 28, 2015 at 4:25:02 PM UTC+8, Jan Ceuleers wrote:
>> On 28/02/15 08:48, catherine.wei1989 at gmail.com wrote:
>> > I still have a doubt: the key file is generated on my PC (as the first ntp server) , when I copied it to the box(client), and I changed the box's ntp server to a second server "3.cn.pool.ntp.org" or some other ntp servers. The authentication still passes. Why is that?
>> 
>> ntpq talks directly to the ntpd process over the network. If you run
>> ntpq without specifying where the server is located it talks to ntpd on
>> localhost. Which time sources ntpd uses is immaterial.
>
>
> Hi, Jan
> I specified the ntp server "3.cn.pool.ntp.org" in the /etc/ntp.conf file. In this case, I run ntpq :config ...   , does it still talk to ntpd on localhost ? and time sources is still "3.cn.pool.ntp.org" ?

3.cn.pool.npt.org is not an ntp time source. It is a dummy name, which
is filled in by pool.ntp.org. For example every time you ping that a
different address comes up

ping -c 1 3.cn.pool.ntp.org
PING 3.cn.pool.ntp.org (202.112.10.36) 56(84) bytes of data.
ping -c 1 3.cn.pool.ntp.org
PING 3.cn.pool.ntp.org (202.112.31.197) 56(84) bytes of data.
ping -c 1 3.cn.pool.ntp.org
PING 3.cn.pool.ntp.org (202.118.1.81) 56(84) bytes of data.

Thus there is no time source "3.cn.pool.ntp.org" ( or to be exact, there
are many)



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