Do we ever want to bind more than 8 multicast MAC addresses?

David Woodhouse dwmw2 at infradead.org
Fri Apr 18 12:03:22 EDT 2008


On Fri, 2008-04-18 at 12:01 -0400, Polychronis Ypodimatopoulos wrote:
> You're not following: Ethernet ports are bytes 12-14 (2 bytes total) on 
> _all_ ethernet frames. IP has nothing to do with this. Instead of 
> looking at the first 6 bytes (destination mac) for a specific multicast 
> address, the filter should be looking at bytes 12-14 for a specific 
> ethernet port.

Ah, sorry. I read it as UDP ports.

It would be hard to do this -- there's a defined mapping from IPv6
addresses to the multicast MAC addresses used, and high-level
applications don't get to muck around with low-level details of the
Ethernet frames.

-- 
dwmw2




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