Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) Options for DHCPv6
Danny Mayer <mayer@ntp.org> Mon, 19 November 2007 18:07 UTC
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Date: Mon, 19 Nov 2007 13:05:11 -0500
From: Danny Mayer <mayer@ntp.org>
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To: Ted Lemon <mellon@fugue.com>
Subject: Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) Options for DHCPv6
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Cc: "ntpwg@lists.ntp.org" <ntpwg@lists.ntp.org>, "dhcwg@ietf.org" <dhcwg@ietf.org>, Brian Utterback <brian.utterback@sun.com>, "Richard Gayraud (rgayraud)" <rgayraud@cisco.com>
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Ted Lemon wrote: > On Mon, 2007-11-19 at 09:07 -0500, Brian Utterback wrote: > >> That having been said, I would like to see a way to pass a FQDN >> as an option, perhaps passing both. Then you could have logic >> like "Here's both, use the name if you can, and use the address if >> you must." >> > > An option in a protocol that produces no different behavior is just an > opportunity for interoperability problems. > > This is actually an old discussion. Danny's position isn't unheard of, > but the fact is that there's really no way in which this option is > different from the other fifty options that tell DHCP clients how to > contact servers. > > There's no reason why this option should use FQDNs while the other fifty > use IP addresses, and there are a number of good reasons not to send > FQDNs, the first and most obvious of which is that they take up more > space in the packet, and space in the packet is very limited. > > There is no way of answering that claim without knowing more about a) those other 50 options; and b) how those options are obtained. So let's step back here for a moment and have someone from the DHCP community explain exactly how and when these options are sent to the client. Remember that those of us concentrating on NTP have only some idea how DHCP is sending these options. Does DHCP: a) Send these options unsolicited when it is requested to send an IP address to be used by the client?; b) Only send these options when requested by the client?; c) something else? When does the client send/receive the request? a) Upon boot b) upon lease renew c) some other time? Except for a) the NTP server is not going to be taking any options from the DHCP server unless some other mechanism (which NTP has not designed) tells it to. That means that the NTP can be up for months never updating it's list of NTP server addresses. In the meantime, Server 1 has stopped running, Server 2 has moved to a different address, Server 3 was always suspect. DCHP has no say in what to do about this, at least so far. DNS at least provides a way of getting a fresh set of addresses. Danny _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] Network Time Protocol (NTP) Options for D… Benoit Lourdelet (blourdel)
- [dhcwg] RE: [ntpwg] Network Time Protocol (NTP) O… Benoit Lourdelet (blourdel)
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Bud Millwood
- [dhcwg] Re: [ntpwg] Digital Evidence Standards an… Shane Kerr
- [dhcwg] RE: [ntpwg] Network Time Protocol (NTP) O… Mark Elliot
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… Harlan Stenn
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… Brian Utterback
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… Brian Utterback
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… David L. Mills
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… Brian Utterback
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… David L. Mills
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… TS Glassey
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… Brian Utterback
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… David L. Mills
- [dhcwg] Digital Evidence Standards and a statemen… TS Glassey
- [dhcwg] Re: [ntpwg] Digital Evidence Standards an… TS Glassey
- [dhcwg] Re: Digital Evidence Standards and a stat… David L. Mills
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Ted Lemon
- [dhcwg] Re: [ntpwg] Network Time Protocol (NTP) O… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Ralph Droms
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… David W. Hankins
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… David L. Mills
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Ted Lemon
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Brian Utterback
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Brian Utterback
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Ted Lemon
- RE: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Benoit Lourdelet (blourdel)
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… David W. Hankins
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… David W. Hankins
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… David W. Hankins
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Ralph Droms
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David L. Mills
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David L. Mills
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Harlan Stenn
- RE: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Benoit Lourdelet (blourdel)
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Mark Stapp
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David W. Hankins
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David W. Hankins
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David L. Mills
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David L. Mills
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Mark Andrews
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Mark Andrews
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Mark Andrews
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Bud Millwood
- RE: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Benoit Lourdelet (blourdel)
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… M. Warner Losh
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- RE: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Benoit Lourdelet (blourdel)
- RE: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… anthony.flavin
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… David W. Hankins
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… David W. Hankins
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David W. Hankins
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Mark Stapp
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… TS Glassey
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David L. Mills
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David L. Mills
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brian Utterback
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… David W. Hankins
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Mark Stapp
- Re: [dhcwg] Re: [ntpwg] Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David L. Mills
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brad Knowles
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Danny Mayer
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Hal Murray
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brad Knowles
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brad Knowles
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- RE: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… anthony.flavin
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… David W. Hankins
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Josh Littlefield
- RE: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Brzozowski, John
- Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Ted Lemon
- Re: [dhcwg] Network Time Protocol (NTP) Options f… Bud Millwood
- Re: [dhcwg] Network Time Protocol (NTP) Options f… Mark Stapp
- Re: [dhcwg] Network Time Protocol (NTP) Options f… Ted Lemon
- RE: [ntpwg] [dhcwg] Re: Network Time Protocol (NT… Woundy, Richard
- Re: [dhcwg] Network Time Protocol (NTP) Options f… Danny Mayer
- RE: [ntpwg] [dhcwg] Network Time Protocol (NTP) O… Richard Gayraud (rgayraud)
- Re: [ntpwg] [dhcwg] Network Time Protocol (NTP) O… Brian Utterback
- Re: [ntpwg] [dhcwg] Network Time Protocol (NTP) O… Brad Knowles
- RE: [ntpwg] [dhcwg] Network Time Protocol (NTP) O… anthony.flavin
- Re: [ntpwg] [dhcwg] Network Time Protocol (NTP) O… Danny Mayer