Hi,
out of a rather funny misunderstanding of RFC 5309, I've ended up with half an implementation of OSPF running in ignorance of the IP subnet mask on a broadcast network. After cleaning up the misunderstanding and taking a step back, I found draft-ietf-ospf-hybrid-bcast-and-p2mp, which I expected to contain a note about this, but no such thing. The general idea would be to operate a broadcast medium with a /32 subnet mask, possibly unnumbered, and allowing adjacencies with just about anything that sends a Hello (and passes auth). The link can operate as regular broadcast, hybrid-bcast-p2mp, or P-t-P (the last would amount to RFC 5309 with the detail that the peer address is not known up front.) (For OSPFv3, this is obviously not interesting since with link-local addresses, there is no notion of similar same-subnet restrictions.) I haven't found anything on this - is this mode of operation already described somewhere? Cheers, David
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