Re: [Ntp] Circular dependencies
Mark Andrews <marka@isc.org> Sun, 17 January 2021 12:22 UTC
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From: Mark Andrews <marka@isc.org>
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Date: Sun, 17 Jan 2021 23:22:28 +1100
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References: <20210117112440.486D740605C@ip-64-139-1-69.sjc.megapath.net>
Cc: NTP WG <ntp@ietf.org>
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To: Hal Murray <hmurray@megapathdsl.net>
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Subject: Re: [Ntp] Circular dependencies
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The initial address queries by ntpdate/ntpd/etc at boot time can be done with CD=1 (checking disabled). For real long term shelf storage the trust anchors for the root will need to be updated. -- Mark Andrews > On 17 Jan 2021, at 22:24, Hal Murray <hmurray@megapathdsl.net> wrote: > > > marka@isc.org said: >> In practice DNS does not need precise time. Implementations know that >> validators and signers are NOT using precise time. BIND for example signs >> records with a time stamp a hour in the past and records are supposed to be >> replaced days before they expire. > > I'm thinking of a different scale on "precise", months or years rather than > hours or days. > > The usual example is a device that has been sitting on the shelf for 10 years. > The only time it has is when the software was built or installed, just before > it was packaged up. > > The telcom guys do that. (Or did.) I wouldn't be surprised by military gear > with similar time scales. > > I could easily imagine a Raspberry Pi being powered off for a whole summer. Or a smart fridge being off for half a year if it lives at a summer home. > > Anything with a file system that is operating can update the last-known-time occasionally. That's good enough for normal certificates if "operating" means turned on once a month, maybe even once a year. > > ----------- > > We should collect a list of files/data that need to be updated occasionally. The obvious ones for this group are root certificates and the time-zone database if you need local time and maybe the leap-second file. > > There is the whole can of worms about the software/protocols still being in use after 10 years. > > -- > These are my opinions. I hate spam. > > >
- [Ntp] Circular dependencies Watson Ladd
- Re: [Ntp] Circular dependencies Tony Finch
- Re: [Ntp] Circular dependencies Daniel Franke
- Re: [Ntp] Circular dependencies Mark Andrews
- [Ntp] Fwd: Circular dependencies Mark Andrews
- Re: [Ntp] Circular dependencies Hal Murray
- Re: [Ntp] Circular dependencies Danny Mayer
- [Ntp] Antw: [EXT] Circular dependencies Ulrich Windl
- Re: [Ntp] Circular dependencies Philip Prindeville
- Re: [Ntp] Circular dependencies Warner Losh
- Re: [Ntp] Circular dependencies Warner Losh
- Re: [Ntp] Circular dependencies Hal Murray
- Re: [Ntp] Circular dependencies Mark Andrews
- Re: [Ntp] Circular dependencies Hal Murray
- Re: [Ntp] Circular dependencies Mark Andrews
- Re: [Ntp] Circular dependencies Mark Andrews