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Re: [dhcwg] [ntpwg] Fwd: New Version Notification for draft-ogud-dhc-udp-time-option-01.txt

Ted Lemon <ted.lemon@nominum.com> Mon, 02 December 2013 20:05 UTC

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From: Ted Lemon <ted.lemon@nominum.com>
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Date: Mon, 02 Dec 2013 15:04:54 -0500
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To: Hal Murray <hmurray@megapathdsl.net>
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Cc: NTP Working Group <ntpwg@lists.ntp.org>, "dhcwg@ietf.org WG" <dhcwg@ietf.org>, Bernie Volz <volz@cisco.com>
Subject: Re: [dhcwg] [ntpwg] Fwd: New Version Notification for draft-ogud-dhc-udp-time-option-01.txt
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On Dec 2, 2013, at 1:56 PM, Hal Murray <hmurray@megapathdsl.net> wrote:
> ted.lemon@nominum.com said:
> [Context is NTP servers next to root DNS servers.]
>> History suggests otherwise.   If an IP address is hardcoded, it will get
>> pummeled by devices that are too dumb to give up. 
> 
> That's why I was suggesting a crappy clock.  Can we get something that is 
> crappy enough that nobody would use it for anything other than getting off 
> the ground yet still good enough for DNSSEC to work?

No.   Think about this seriously.   Who is going to tweak this?   The end-user?   This isn't realistic.   We had millions of home gateways DDOSing a university NTP server for years because the router vendor burned the IP address of the NTP server into the firmware.   I doubt anybody got decent time out of this arrangement, but nevertheless it persisted.

> Are there two layers of DHCP?  ISP to home router and home router to PC.

Yes.

> If ISPs ran NTP servers, say next to their DNS servers, could DHCP provide IP 
> Addresses for both DNS and NTP servers over both hops?

Yes.

> Is it reasonable to trust an ISP's NTP servers?

See my first response on this thread: http://www.ietf.org/mail-archive/web/dhcwg/current/msg15039.html

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