[ntp:hackers] Receiving smeared time

Miroslav Lichvar mlichvar at redhat.com
Tue Jun 30 09:07:14 UTC 2015


On Tue, Jun 30, 2015 at 12:17:20AM -0400, Danny Mayer wrote:
> The real problem here is that the Refid is NOT an IP address. From the
> RFC it is meant to be formed from an IP address but any 32-bit number
> will do. Furthermore the reference implementation makes the mistake of
> setting the Refid based on the IP address from which it is sent instead
> of setting up and using the same Refid for ALL interfaces and addresses.

The trouble is that currently the refid is generated on clients,
there is no way for a server to tell its clients its refid. The
clients generate it from the IP address of the server because there is
no other information that would be stable and unique to the server.

-- 
Miroslav Lichvar


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