[ntp:questions] Source address in response not the same as target address in request

Danny Mayer mayer at ntp.isc.org
Sat Oct 11 01:14:34 UTC 2008

Rick Jones wrote:
> Danny Mayer <mayer at ntp.isc.org> wrote:
>> The general answer is no. It binds to all addresses but use of the
>> -L option will mean that it ignores anything not received on :0
>> interfaces which is what I think you are saying. An enhancement that
>> I have worked on will allow you to specify the addresses to listen
>> on and to send on.  It's not ready yet.
> If it simply sends via the socket on which the query was recieved,
> having bound that socket to a given IP should result in that IP being
> used as the source IP of the response.
> Perhaps there is a reason to send via another socket, but as I'm
> typing I cannot think of it.
> rick jones

NTP always replies on the same interface with the same IP address. It
should never reply with a different IP address as the receiving end
would drop it as invalid.


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