Re: [Linuxptp-users] ptp4l stop with ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES message.

[Richard C. <ric...@gm...>]

On Tue, Mar 13, 2012 at 08:58:36AM +0900, Takahiro Shimizu wrote:
> > Wireshark places the MAC into promiscuous mode. Maybe your MAC is
> > dropping UDP multicasts?
> >
> >
> Yes, EG20T MAC drops UDP multicast in the situation. I think linuxptp seems
> starting with promiscuous mode and leaves the promiscuous mode in the
> situation.
> However I can not see the any code about promiscuous mode in the linuxptp
> source code.

The ptp4l program calls setsockopt(IP_ADD_MEMBERSHIP), and this makes
the networking stack do what it needs to (eg. set the multicast
filter) in order to make it happen at the Ethernet level.

> I want that linuxptp re-start automatically getting new announce message
> after ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES.

Well, if the master stops transmitting, then there is nothing linuxptp
can do about it.

You have a hardware (or driver) bug.

Richard