I attempted to enable UDP multicast by setting net.ipv4.all.rp_filter = 0 in /etc/sysctrl.conf with no luck
However, I used your suggestion to use layer 2 and it did "just work" which is really nice. It is also really refreshing to see a mailing list responded to so quickly, and with such accurate and helpful information. Thank you very much. -Robb On Tue, May 26, 2015 at 3:53 PM, Richard Cochran <[email protected]> wrote: > On Tue, May 26, 2015 at 03:29:01PM -0500, Robb wrote: >> I am having trouble getting PTP to work over a network bridge br0. > > I have not tried PTP over a Linux SW bridge, and I am not sure if the > kernel stack will play along. In my experience, Linux SW bridging is > a bit flakey. > > (PTP *does* work over tun/tap, but only after I patched the kernel.) > >> So what is the bridge messing up? And is there a way to fix it? > > The default transport is multicast UDP. Maybe the SW bridge is > dropping multicast. Run wireshark on the end points to see if the PTP > messages are getting through. > >> I would appreciate any insight I can get. Even if it is a suggestion for a >> better topology. > > One easy thing to try is Layer2 transport: > > ptp4l -i eth0 -m -q -2 > > This doesn't require the stack to join the multicast group, and so > maybe it will "just work." > > HTH, > Richard ------------------------------------------------------------------------------ _______________________________________________ Linuxptp-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linuxptp-users
