[ntp:questions] Re: Different types of associations in the ntpq billboard

Danny Mayer mayer at ntp.isc.org
Tue Apr 11 13:13:44 UTC 2006

Ronan Flood wrote:
> mayer at ntp.isc.org (Danny Mayer) wrote:
>>> Looking at ntpq_ops.c/decodeaddrtype(), it only shows "b" for an IPv4
>>> non-multicast destination address ending in 255 -- I guess you're
>>> subnetting, or using IPv6.
>> That's not surprising since that basically defines broadcasting. IPv6
>> does not have broadcast.
> Fair enough for IPv6 then, but in IPv4 if your local net is say
>, your broadcast address is
> Perhaps some use should be made of pmode=MODE_BROADCAST?

Probably, but ntpq receives the data as-is and doesn't have access to
that information. I will have to take another look at the definition of
broadcast before I respond to the first part of your question.


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