Re: [Linuxptp-users] Multicast group (re)join issue vs IGMP snooping

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

On Fri, Feb 18, 2022 at 05:42:57PM +0000, Keller, Jacob E wrote:

> (in fact, there is no real interface to do this in the socket
> options.. There's simply a join and leave group option, but no
> mention of needing to re-join periodically or what attempting to
> join an already joined group would do).

Exactly.

You can't expect user space to blindly retry joining a group with zero
feedback as to whether the join was successful or not.  Doing so is
voodoo engineering.

If there is a bug, then it is a kernel bug.

Thanks,
Richard