On Thu, Feb 17, 2022 at 11:29:03PM +0000, Keller, Jacob E wrote: > I think we at least need to re-send these when the link changes,
We do, because the link down/up causes the transport to be closed and opened again. > though > we perhaps were thinking that the kernel does this for us? Maybe thats a > bug or maybe we have to set an option? > > There is no mention about whether we would need to re-issue this socket > option in the "man 7 ip" manual page. >From the application POV, there is only joining the group. After that, there is nothing more to do. > > Maybe it is Linux kernel issue. Then take it up on the netdev list please. > However for comparison ptpd2 implements > > periodic multicast group (re)join (optionmaster_igmp_refresh_interval): > > src/dep/net.c:netInitMulticastIPv4() > > https://github.com/ptpd/ptpd/blob/master/src/dep/net.c#L605 > > https://github.com/ptpd/ptpd/blob/master/src/dep/net.c#L2278 > > https://github.com/ptpd/ptpd/blob/master/src/protocol.c#L607 > > https://github.com/ptpd/ptpd/blob/master/src/protocol.c#L1120 Other > > proprietary PTP devices send IGMP packets periodically every 1-2s and Crazy to spam the network like that. > > work with the switches despite IGMP snooping enabled... > > > > This sounds like what we should be doing as well. No, I don't agree. This is no different than ARP. If the kernel needs to re-send IGMP, then let it. Cisco's PTP switch has issues. Have you looked at the residence times? I don't feel like implementing workarounds for buggy hardware. Thanks, Richard _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
