Re: [Linuxptp-users] PTP packets not being acted upon by RHEL 7 server

[Keller, J. E <jac...@in...>]

> -----Original Message-----
> From: Richard Cochran [mailto:ric...@gm...]
> Sent: Thursday, December 15, 2016 12:03 PM
> To: Taber, Alan <ala...@lm...>
> Cc: lin...@li...
> Subject: Re: [Linuxptp-users] PTP packets not being acted upon by RHEL 7 server
> 
> On Thu, Dec 15, 2016 at 06:18:33PM +0000, Taber, Alan wrote:
> > I have a SecureSync 9400 GrandMaster clock that is appropriately putting out
> PTPv2 Sync and Announce packets (verified by Wireshark listening on a different
> network node). I have run tcpdump -i enp9s0 -v to check to see that the packets
> are getting through to my RHEL 7 server, and they are showing up.
> >
> > Yet, when I run ptp4l -i enp9s0 -m, I get the following:
> 
> Here ptp4l uses the default UDP/IPv4 transport.
> 
> > What indicators should I be looking at to see why the local ptp daemon isn't
> listening to the packets the server is receiving?
> 
> Possibly the server is configured for Layer2 or IPv6?
> 
> HTH,
> Richard

Additionally, check that wireshark and tcpdump are not running in promiscuous mode when you test. It is possible that you have a firewall (firewalld for example) disabling the packets, but when you run tcpdump in promiscuous mode it will be bypassing the firewall. This I believe is the default firewall settings for RHEL 7 so you should make sure you change that in firewalld to enable the traffic.

Thanks,
Jake