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

[Dale S. <dal...@gm...>]

On Thu, Dec 15, 2016 at 7:27 PM, Keller, Jacob E
<jac...@in...> wrote:
>
> 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.

Yep.. Something very similar happened to me before.  mdns was just not
working and when I fired up wireshark, it *magically* got fixed.  I
needed to all "allmulti" to the iface.

Check the interface  with either ifconfig or ip link  and make sure
MULTICAST is enabled....

-Dale