Hi, On Wed, 2015-02-11 at 19:34 +0000, Bryan Yeung wrote: > Hello, > > I'm trying to setup PTP with software timestamping between two machines on > my local network. > > When running ptp4l, both machines end up assuming the grand master role > (i.e. I see this on both machines): > ptp4l[1747.050]: PI servo: sync interval 1.000 kp 0.100 ki 0.001000 > ptp4l[1747.051]: eth0: SO_SELECT_ERR_QUEUE: Protocol not available > ptp4l[1747.051]: port 1: INITIALIZING to LISTENING on INITIALIZE > ptp4l[1747.051]: port 0: INITIALIZING to LISTENING on INITIALIZE > ptp4l[1754.276]: port 1: announce timeout > ptp4l[1754.276]: port 1: LISTENING to MASTER on > ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES > ptp4l[1754.276]: selected best master clock 089e01.fffe.e6e911 > ptp4l[1754.276]: assuming the grand master role > ptp4l[1754.277]: port 1: master tx announce timeout > ptp4l[1754.277]: port 1: setting asCapable > ptp4l[1755.277]: port 1: master sync timeout > ptp4l[1756.277]: port 1: master sync timeout > ptp4l[1756.278]: port 1: master tx announce timeout > ptp4l[1757.277]: port 1: master sync timeout > ptp4l[1758.277]: port 1: master sync timeout > ptp4l[1758.278]: port 1: master tx announce timeout > ... > > > If I run tcpdump on either machine, I can see the messages from both > machines to the multicast address: > 11:12:04.114210 IP 172.23.188.135.320 > ptp-primary.mcast.net.320: UDP, > length 64 > 11:12:04.235244 IP 172.23.188.213.319 > ptp-primary.mcast.net.319: UDP, > length 44 > 11:12:04.235294 IP 172.23.188.213.320 > ptp-primary.mcast.net.320: UDP, > length 44 > 11:12:04.450571 IP 172.23.188.213.319 > ptp-primary.mcast.net.319: UDP, > length 44 > 11:12:04.450620 IP 172.23.188.213.320 > ptp-primary.mcast.net.320: UDP, > length 44 > 11:12:04.451046 IP 172.23.188.213.320 > ptp-primary.mcast.net.320: UDP, > length 64 > 11:12:05.113616 IP 172.23.188.135.319 > ptp-primary.mcast.net.319: UDP, > length 44 > 11:12:05.113677 IP 172.23.188.135.320 > ptp-primary.mcast.net.320: UDP, > length 44 > 11:12:05.234128 IP 172.23.188.213.320 > ptp-primary.mcast.net.320: UDP, > length 64 > > > Any debugging tips or suggestions would be greatly appreciated. > > > Thanks! > > Bryan > >
Try ensuring any firewall (iptables, firewalld, etc) has allowed multicast traffic. That's usually the symptom I see when the packets arrive in tcpdump but not the application. Regards, Jake ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Linuxptp-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linuxptp-users
