Re: [Linuxptp-users] ptp4l and SHM?

[Gary E. M. <ge...@re...>]

Yo Miroslav!

On Tue, 31 Oct 2017 11:52:14 +0100
Miroslav Lichvar <mli...@re...> wrote:

> > Nope.  Can you suggest a working configuration or a howto?  I
> > thought it used to work.  
> 
> A minimal configuration using software timestamping and the NTP SHM
> segment #2 would be:
> 
> 1. on master run: ptp4l -S -i eth0 -m
> 2. on slave run: ptp4l -s -S -i eth0 -m --clock_servo NTPSHM
> --ntpshm_segment 2

Bit I do not want a master/slave configuration.  I want multi-master.
Like this:

http://www.catb.org/gpsd/gpsd-time-service-howto.html#_providing_local_ntp_service_using_ptp

That config used to work.

> If there are some ptp message from the master, it's likely a firewall
> rule which blocks the messages from reaching ptp4l. UDP ports 319 and
> 320 need to be allowed.

Nope, my config is all local network, I only firewall at the connection
to my ISP.

> If no messages appear, the switch (if it's a managed switch) might
> need to be configured to allow multicast traffic between the hosts.

Nope, dumb switches only.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	ge...@re...  Tel:+1 541 382 8588

	    Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin