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

David Woodhouse dwmw2 at
Fri Apr 18 12:32:00 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.

Forgive my ignorance... you're not talking about the EtherType field,
which is set to 0x800 to indicate IPv4 packets or 0x86dd for IPv6?

It doesn't seem practical to use that for application-specific purposes.


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