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Re: [Ntp] WG Call for Adoption: draft-stenn-ntp-extension-fields

Harlan Stenn <stenn@nwtime.org> Thu, 27 September 2018 22:01 UTC

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From: Harlan Stenn <stenn@nwtime.org>
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Date: Thu, 27 Sep 2018 15:01:40 -0700
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Subject: Re: [Ntp] WG Call for Adoption: draft-stenn-ntp-extension-fields
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Hal,

Re "declaring" what is supported, you're saying you are supporting:

 https://tools.ietf.org/html/draft-stenn-ntp-i-do-04

right?

I think everything else in this thread is clearly and fully covered in
the (updated):

 https://tools.ietf.org/html/draft-stenn-ntp-extension-fields-07

H


On 9/27/18 1:36 AM, Hal Murray wrote:
>> An NTPv4.1 packet would have the following format:
>> - 48-octet NTPv4 header
>> - 2-octet magic number (the packing EF type)
>> - 2-octet length of all data following the NTP header (the packing EF
>>   length)
>> - >24 octets of one or more EFs with no restrictions on minimal length
> 
> A possible alternative would be an EF that said no bare MAC.
>   2 byte magic number
>   2 byte length
> 
> --------
> 
> Is this whole problem a wild goose chase?  If two systems are using MACs, they 
> have exchanged keys.  Could they also exchange a no-bare-MAC flag using the 
> same mechanism?
> 
> Why can't a system simply declare that it doesn't support bare MACs?  If so, 
> why would anybody ever send it one?
> 
> 

-- 
Harlan Stenn <stenn@nwtime.org>
http://networktimefoundation.org - be a member!

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