Re: [Linuxptp-users] Should Linux PTP syn the clock used by date between PCs?

[Richard C. <ric...@gm...>]

On Wed, Nov 11, 2015 at 05:35:18PM +0000, Keller, Jacob E wrote:
> For master, you need to use phc2sys to sync the kernel time to the PHC
> on the NIC doing the timestamping, on the slave you do the reverse,
> which is what the "-r -r" option is for.

The double -r is for the master.

Actually, if you don't care which node is master/slave, then you can
leave off '-s' (slave only) from ptp4l and put the double -r on every
node's phc2sys command line.
 
> Best practice is to use a different piece of hardware as a grand
> master, rather than using one of the NICs directly as master.

Yep.

Thanks,
Richard