Questions tagged [ptp]

Precision Time Protocol is used to synchronize clocks with sub-microsecond accuracy.

Filter by
Sorted by
Tagged with
1
vote
0answers
397 views

Retrieving the current PTP settings of an Ubuntu machine

I have an Ubuntu machine (18.04) with PTPd installed. I want to write a script that can determine what PTP settings have been set previously. Specifically, I want to find information on the master PTP ...
0
votes
0answers
37 views

Get PTP4L to fail when it can't connect to an external server

I have a CentOS 7.8 server which has its clock synchronised using the PTP4L PTP service. I'd like the service to fail when it's unable to synchronise with an external server, so I invoke it with --...
1
vote
0answers
101 views

Network cards supporting PTP one-step-sync

We currently want to setup a PTP Grandmaster using ptp4linux on a Linux host. The slave devices rely on PTP one-step-sync but we haven't found any purchaseable network card on the marked which has ...
1
vote
1answer
2k views

Packets difference between PTP and gPTP

I'm trying to understand few things about gPTP (IEEE 802.1AS). I am using the open source implementation by AVnu (https://github.com/AVnu/gptp). I looking on the packets using Wireshark, and they ...
4
votes
1answer
542 views

Is PTP really more precise than NTP? If so, why?

I have read quite a bit about NTP and PTP time keeping protocols. While many sources claim that PTP is more precise than NTP for that type of granularity - the reason is not as clear. Why can't NTP be ...
0
votes
0answers
866 views

Use of PTPd on RedHat/CentOS

I need to create a reliable and accurate synchronization between two CentOS 6 machines connected through a direct Ethernet connection. I've seen that on Linux several implementation of the IEEE 1588 ...
1
vote
2answers
465 views

PTP (or NTP) and Domain Controller clock sync

We need a high precision (1ms) clock synchronization across multiple machines which are part of the domain. The idea is to use a PTP solution. Is it possible to setup a computer which is part of the ...
1
vote
0answers
343 views

How to configure a redundant PTP server

I have a Sonoma GPS time server and a server, which should synchronise itself to the GPS clock, and serve as a fallback option. The time should be synchronised using PTP (Precision-Time-Protocol). ...
1
vote
1answer
6k views

ptp time synchronization on centos6/rhel

I need to setup time synchronization using PTP (precision time protocol). I'll get server address. I found ptpd server (version 2.1). I created startup files in /etc/init.d. But wondering what options ...
3
votes
2answers
3k views

Why PTP uses Sync-followup pairs?

The PTP (Precision Time Protocol), uses Sync message then Follow-up message, as described in the article "Understanding the IEEE 1588 Precision Time Protocol". I don't understand why do we need ...