[ntpwg] Additional text for SNTP

[Danny Mayer]

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