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Filtering Ethernet multicasr frames

From: Joan Lledó
Subject: Filtering Ethernet multicasr frames
Date: Wed, 28 Jun 2017 19:33:01 +0200


finally I've managed to fix the problem with IPv6 in my LwIP
translator, and the problem was that the driver was discarding some
Ethernet multicast frames.

I've fixed it by enabling the IFF_ALLMULTI flag through
device_set_status(), that is, now there is no filtering and all
multicast frames reach the stack.

It is interesting to read the link in [1], that divides the drivers
into three classes depending on their capacity to filter multicast
frames. Now we're in the first class, not filtering at all, but I'd
like to know if the device interface provides a way to manage a list
of allowed addresses, like in the third class. Is that possible?


[1] http://www.xml.com/ldd/chapter/book/ch14.html#t13

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