[ntp:questions] Re: Why so many dead NTP servers in pool.ntp.org?

Danny Mayer mayer at ntp.isc.org
Tue Dec 13 17:33:49 UTC 2005


Tapio Sokura wrote:
> Raphae wrote:
> 
>> when running the command
>>
>> # ntptrace pool.ntp.org
>>
>>
>> more than half of the servers in the pool seem to be dead.  Isn't
> 
> 
> Are you sure that they are dead, or just not responding to NTP control
> mode (mode 6) packets? Because mode 6 is what ntptrace uses, when the
> actual NTP time queries are sent/received using modes 1-5. All pool
> servers that I just tried did answer to normal time queries (mode 3)
> just fine. Some server operators choose to restrict mode 6 queries, that
> is completely acceptable by the pool rules.
> 
>   Tapio

I wasn't aware that it was using mode 6 NTP packets. It may be worth
while changing ntptrace to use normal mode 3/4 packets.

Danny



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