Sending or receiving multicast packets

Till Straumann strauman at
Mon Jan 25 14:26:31 UTC 2010

Joel Sherrill wrote:
> On 01/25/2010 05:56 AM, Diego Sanz wrote:
>> Hi to everyone!!
>> In this days I have done several questions in the forum about sending 
>> and receiving multicast packets with rtems.
>> I think that now I have a more specific question.
>> ¿do I have to modify only the driver in the path 
>> /home/rtems/rtems-work/rtems/c/src/lib/libbsp/m68k/mcf5235/network, 
>> or I have to modify somthing inside the source of RTEMS too?
>> If someone knows something, and knows which structure and in wich 
>> file I have to do some modifications, I will be very grateful!
> Multicast works fine with RTEMS.  The driver does have to support a 
> couple of
> multicast IOCTL's.  See libbsp/powerpc/gen5200/network/network.c for 
> an example
> of a driver that has the boiler plate to handle the IOCTL but the NIC 
> requires no
> actions to enable it.
Don't forget to add IFF_MULTICAST to the interfaces' if_flags.... 

-- Till
> There is a standard multicast demo program from the net modified slightly
> to run on RTEMS in the network-demos/multicast.
> So this is no big deal but does require NIC multicast support.
> --joel
>> Lot of thanks!!
>> Diego
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