On Mon, Jan 09, 2017 at 09:05:49AM +0100, Johannes Berg wrote: > 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.
This example is the other way round. It specifies how the IP destination should look like in case of link-layer broadcast. Not how the link-layer destination should look like in case of a multicast/broadcast IP destination. Any other examples?
