[ntpwg] Additional text for SNTP

[David L. Mills]

Danny,

I'm not sure any words are necessary. An SNTP client is ipso facto a 
client and by spec sends only mode-3 messages. We have defined an SNTP 
server and an SNTP client, but not an SNTP peer. Also, I'm a little 
uneasy about saying what an SNTP client can or cannot accept. It can't 
have dependent clients, so in truth we don't care what it does with the 
server packet other than to say if it follows the peer process rules it 
will make good clock.

Dave

Danny Mayer wrote:

> I'd like to propose additional text be added to section 14 on SNTP in
> the NTPv4 protocol draft. I'm requesting this addition due to an issue
> that came up last week with an SNTP client.
>
> Suggested text:
>
> "An SNTP client MUST only send mode 3 packets (client) and MUST only
> accept mode 4 (server) and mode 5 (broadcast) packets. An SNTP client
> MAY send or receive mode 6 (NTP control) packet. All other packet modes
> MUST be ignored.
>
> An SNTP server MUST not send mode 3 (client) packets."
>
> Any objections or refinements?
>
> Danny
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