[ntp:questions] Three NTP servers, one strange IP-address in 'refid'

Miroslav Lichvar mlichvar at redhat.com
Wed Apr 2 09:21:10 UTC 2014

On Wed, Apr 02, 2014 at 09:48:26AM +0200, Sander Smeenk wrote:
> Quoting E-Mail Sent to this address will be added to the BlackLists (Null at BlackList.Anitech-Systems.invalid):
> > I guess it could also be a IPv6 ref mangling issue?
> That could well be. We use IPv6 where we can.
> But that would constitute this refid issue a bug.
> One that is rather confusing and time-consuming.

For IPv6 addresses the refid is defined as first 4 bytes of the MD5
sum of the address. With 2001:7b8:3:32:213:136:0:252 (tt52.ripe.net)
that is 0xac023551, or in the quad-dotted notation.

Miroslav Lichvar

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