[Bridge] [PATCH net-next] bridge: multicast to unicast

Johannes Berg johannes at sipsolutions.net
Mon Jan 9 08:05:49 UTC 2017


On Sat, 2017-01-07 at 16:15 +0100, Linus Lüssing wrote:

> Actually, I do not quite understand that remark in the mac80211
> multicast-to-unicast patch. IP should not care about the ethernet
> header?

But it does, for example RFC 1122 states:

         When a host sends a datagram to a link-layer broadcast address,
         the IP destination address MUST be a legal IP broadcast or IP
         multicast address.

         A host SHOULD silently discard a datagram that is received via
         a link-layer broadcast (see Section 2.4) but does not specify
         an IP multicast or broadcast destination address.

You can probably find other examples too.

johannes


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