Re: setting ntp with dhcp

2021-10-04 Thread Giovane C. M. Moura via NANOG
Thanks everyone for their answers. To summarize: 1. NTP from DHCP usage: * Not all clients accept DHCP configs for NTP (like android phones) * WiFi VoIP phones use ntp from dhcp (default) -- Google Fiber case showed that VOIP phones may fail to register if DHCP provides

Re: setting ntp with dhcp

2021-10-01 Thread Mel Beckman
Giovane, While Murkund’s point about some devices ignoring this option (I’m not sure why any cellphones would accept it, for example, Android or otherwise, since they get time from the cellular network), it’s pretty much an industry standard that desktop and WiFi *VoIP* phones all use it. It’s

Re: setting ntp with dhcp

2021-10-01 Thread Blake Hudson
Hi Giovane, a time server is a required DHCP option for DOCSIS devices. This uses the older TIME protocol (UDP port 37, RFC 868). However, it's common for DOCSIS devices like MTAs, STBs, etc to also request and use NTP server addresses received via DHCP (they may apply this using SNTP rather th

Re: setting ntp with dhcp

2021-10-01 Thread Mukund Sivaraman
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 w

setting ntp with dhcp

2021-10-01 Thread Giovane C. M. Moura via NANOG
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 a