[ntp:questions] what is refid in ntpq -pn

Steven Sommars stevesommarsntp at gmail.com
Sat May 6 22:12:59 UTC 2017


RFC5905   Reference ID (refid)
   ...
   If using the IPv4 address family, the identifier is the four-
   octet IPv4 address.  If using the IPv6 address family, it is the
   first four octets of the MD5 hash of the IPv6 address.

Has this been changed?

In any case the Refid field size, 4 bytes, is too small to contain an IPv6
address.

On Sat, May 6, 2017 at 4:39 PM, David Woolley <
david at ex.djwhome.demon.invalid> wrote:

> On 06/05/17 22:24, Hans Mayer wrote:
>
>
>> I always thought "refid"  for command "ntpq -pn" shows the next upstream
>> server for the remote server listed below "remote". But now I have my
>> concerns.
>>
>>
> Officially, it is an opaque 32 bit identifier for the selected upstream
> peer of the peer.  You are not supposed to assume it has any more meaning,
> even though, on pure IPv4 systems, it is derived in the way you describe.
>
> Note that the selected peer is not the only source of time; it is just the
> one used for the quality parameters.
>
>
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