[Ntp] Re: NTPv4 client behavior to ntpv3 reply
Harlan Stenn <stenn@ntp.org> Tue, 30 July 2024 00:09 UTC
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Date: Mon, 29 Jul 2024 17:09:43 -0700
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To: rémy decrock <rmdck@rmdck.fr>, ntp@ietf.org
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From: Harlan Stenn <stenn@ntp.org>
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Subject: [Ntp] Re: NTPv4 client behavior to ntpv3 reply
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On 7/29/2024 8:11 AM, rémy decrock wrote: > Hello, > > I have a question about the NTP v4-v3 compatiblity. > According to the RFC https://datatracker.ietf.org/doc/rfc5905/, v3 and > v4 are compatible. > By compatible, I understand that if a client perform an NTPv3 request > to a NTPv4 server, this one is able to answer in an understandable way > to the client. > But what if a NTPv4 client receives an NTPv3 reply to his NTPv4 requests? "It depends." I say this because the reference implementation replies with the packet format it knows about, using the version field from the request. So you will not see the case you describe from the reference implementation. We took great pains to make sure clients and servers running different NTP versions would interoperate successfully. If the V3 server was written by somebody else, it will behave the way it will behave. The first/early release of NTPv4 happened before February 1998. The last release of NTPv3 was in November of 1998. There were no interoperability complaints around the switch from v3 to v4. NTPv3 has not been supported for over 25 years' time. I gotta wonder how many v3 servers are actually still running out there. > Thanks. > > _______________________________________________ > ntp mailing list -- ntp@ietf.org > To unsubscribe send an email to ntp-leave@ietf.org -- Harlan Stenn <stenn@ntp.org> The NTP Project is part of https://www.nwtime.org/ - be a member!
- [Ntp] Re: NTPv4 client behavior to ntpv3 reply Harlan Stenn
- [Ntp] NTPv4 client behavior to ntpv3 reply rémy decrock
- [Ntp] Re: NTPv4 client behavior to ntpv3 reply rémy decrock
- [Ntp] Re: NTPv4 client behavior to ntpv3 reply Harlan Stenn
- [Ntp] Re: NTPv4 client behavior to ntpv3 reply Martin Burnicki