UDP/123 policers & status

Mon Mar 30 09:08:18 UTC 2020

On 3/30/2020 2:01 AM, Ragnar Sundblad wrote:
> 
> 
>> On 30 Mar 2020, at 08:18, Saku Ytti <saku at ytti.fi> wrote:
>>
>> On Mon, 30 Mar 2020 at 01:58, Ragnar Sundblad <ragge at kth.se> wrote:
>>
>>> A protocol with varying packet size, as the NTS protected NTP is,
>>> can easily have the bad property of having responses larger than the
>>> requests if not taken care. Don’t you see that?
>>
>> Why? Why not pad requests to guarantee attenuation vector until
>> authenticity of packets can be verified?
> 
> Right, and NTS does that.

There is more to NTP than NTS.

Are y'all seriously recommending that NTP always sends a max-sized
packet as a client request so the client/server can send back an
identical response?

The alternative seems to be that the client sends a smaller request and
is ready when the response from the server is "Send your request again,
but this time pad it to NNN bytes so I can respond with the same sized
packet"?

> Ragnar

-- 
Harlan Stenn <stenn at nwtime.org>
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