> I think this all means that for a multi-homed host, we should not > automatically add a route for the 169.254/16 network. Instead, we > should just add specific /32s as discovered; and use ARP when we > need to find a new 169.254.x.y -> MAC translation.MacOS X has the notion of interface priorities; from RFC-3927: Mac OS X ensures that the connected interface with the highest priority is associated with the Link-Local subnet. Packets addressed to a Link-Local address are never sent to the default gateway, if one is present. Link-local addresses are always resolved on the local segment. Mac OS X implements media sense where the hardware and driver support it. When the network media indicates that it has been connected, the autoconfiguration process begins again, and attempts to re-use the previously assigned Link-Local address. When the network media indicates that it has been disconnected, the system waits four seconds before de-configuring the Link-Local address and subnet. If the connection is restored before that time, the autoconfiguration process begins again. If the connection is not restored before that time, the system chooses another interface to autoconfigure.
But OS X also only supports Zeroconf on one interface at a time. We Can Do Better.
> There still remains the possibility of multiple distinct hosts > having the same LLA IP address on separate local links; each > attached to a separate interface. In practice that situation should > be sufficiently rare that we can afford to ignore it until someone > comes up with some clever way to handle it. (Or we all move to IPv6 > and it becomes moot.) See section 4 of RFC-3927.
No, that covers merging two previously disjoint networks; I don't think that it is intended to handle the case of a multi-homed host that is connected to both of them while keeping them separate.
-Pat _______________________________________________
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