Hi Stan,

Thanks for the reverse path filtering "relaxed" setting. That did the trick!  
Linux boxes are now listening to the GrandMaster clock. 

And everyone else, thanks for all your suggestions! I know a lot more now than 
I did before about how to set up PTP here, and I appreciate you taking the time 
to respond.

Best regards,
Alan

-----Original Message-----
From: Moravec, Stanislav (ERT) [mailto:stanislav.mora...@hpe.com] 
Sent: Friday, December 16, 2016 2:51 AM
To: Keller, Jacob E <jacob.e.kel...@intel.com>; Taber, Alan (US) 
<alan.ta...@lmco.com>; Richard Cochran <richardcoch...@gmail.com>
Cc: linuxptp-users@lists.sourceforge.net
Subject: EXTERNAL: RE: [Linuxptp-users] EXTERNAL: Re: PTP packets not being 
acted upon by RHEL 7 server

Another option, besides firewall, is Reverse Path filtering. Setting rp_filter 
to relaxed (=2) may help in some situations.

regards
Stan


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