nanog mailing list archives
Re: setting ntp with dhcp
From: Mukund Sivaraman <muks () mukund org>
Date: Fri, 1 Oct 2021 20:35:54 +0530
Hi Giovane On Fri, Oct 01, 2021 at 04:12:15PM +0200, Giovane C. M. Moura via NANOG wrote:
hello folks, So DHCP can also be used to set NTP servers on clients, for both IPv4[rfc2132] and IPv6[rfc5908]. I'm looking for statistics on setting NTP servers on clients using DHCP, in the wild. Does anyone know if there is any available somewhere? I'm also looking for reports from operators and their experiences on this, and why they use (or not) this DHCP feature, and what types of networks is this deployed, and their motivations, etc.
Some PC OSs such as Linux distributions obey the "ntp-servers" ISC DHCP option (mapped to option code 42 in RFC 2132 section 8.3) and configure the client's NTP service with it. But not all DHCP clients do. E.g., Android phones ignore this option completely. We use this option in our office to configure a local timeserver (uses a Garmin GPS 18x LVC receiver), but it only works on client machines that attempt to make use of that option. Mukund
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Current thread:
- setting ntp with dhcp Giovane C. M. Moura via NANOG (Oct 01)
- Re: setting ntp with dhcp Mukund Sivaraman (Oct 01)
- Re: setting ntp with dhcp Mel Beckman (Oct 01)
- Re: setting ntp with dhcp Giovane C. M. Moura via NANOG (Oct 04)
- Re: setting ntp with dhcp Blake Hudson (Oct 01)
- Re: ntp with dhcp Hal Murray (Oct 02)
- Re: ntp with dhcp Eliot Lear (Oct 04)
- Re: setting ntp with dhcp Mukund Sivaraman (Oct 01)