[ntp:questions] multicast - TTL

Danny Mayer mayer at ntp.isc.org
Thu Feb 22 04:33:39 UTC 2007


Martin wrote:
> (I changed the subject for this separate issue,
> it was: multicast - wrong interface)
> 
> Peter Pramberger wrote:
>>> That's a separate question and most likely a bug. I don't know why the
>>> ttl is set to 96, there aren't that many hops in the world...
>> That's by design. Please see
>>
>> https://ntp.isc.org/bugs/show_bug.cgi?id=715#c16
>> http://lists.ntp.isc.org/pipermail/questions/2005-August/006427.html
> 
> Such behavior seems to be not in line with the documentation:
> - - - - - - -
> ttl ttl
>     This option is used only with broadcast server and manycast client modes. 
> It specifies the time-to-live ttl to use on broadcast server and multicast 
> server ... 
> 
> http://www.eecis.udel.edu/~mills/ntp/html/confopt.html
> - - - - - - -
>

Yes, and this whole idea troubles me. The phrase "Principle of Least
Astonishment" comes to mind.

Danny



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