> -----Original Message-----
> From: Robert Carter [mailto:robert.car...@octoscope.com]
> Sent: Friday, March 15, 2019 11:26 AM
> To: Keller, Jacob E <jacob.e.kel...@intel.com>; 
> linuxptp-devel@lists.sourceforge.net
> Subject: Re: [Linuxptp-devel] mcast_bind patch
> 
> > What version of the Linux kernel are you using?
> 
> $ uname -a
> Linux SuperMicro 4.15.0-30-generic #32-Ubuntu SMP Thu Jul 26 17:42:43
> UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

That's odd. According to the IP docs, IP_MULTICAST_IF should be taking the 
imr_index to indicate which device it should bind to.

We obtain the index using sk_interface_index, which should force the kernel to 
bind only to the device we passed in.

I wonder if that's somehow got broken in the kernel?

Thanks,
Jake

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