[ntp:hackers] What does "interface listen wildcard" do?

Philip Prindeville philipp_subx at redfish-solutions.com
Sun Jul 14 01:37:45 UTC 2013


On Jul 13, 2013, at 6:52 PM, Danny Mayer <mayer at ntp.org> wrote:

> On 7/12/2013 10:37 PM, Hal Murray wrote:
>> 
>> philipp_subx at redfish-solutions.com said:
>>> You can't refuse the packet: it's a stateless connection.
>> 
>> "State" is a fuzzy word in this context.  How much state do you need?  UDP 
>> doesn't have sequence numbers, but the receiver does have the whole packet so 
>> it can send something back to the sender to say "didn't work".  I'd call that 
>> "refused".
>> 
> 
> No, that not the meaning of refused. The meaning of refused is that the
> system is refusing to accept packets sent to a particular address and
> port number.

It would need to do so as part of the NTP protocol, and we'd need to create a new message type, get it approved by the IETF, etc.  Seems like a lot of work for little benefit.

-Philip



> 
> Stateless means that the packet is sent and the packet may or may not be
> received. There is no acknowledgement, unlike TCP. Delivery is not
> guaranteed.
> 
> Danny



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