Matthew Dempsky from Mochi mailed me some suggestions for nodefinder. Now the multicast_ttl is an application parameter so multicast routing can be used; separate send and receive sockets are employed to ensure the right source address on BSD; and the discovery packet is signed using the cookie as a secret which prevents (hopeless but annoyingly logged) connect attempts to nodes with different cookies and also prevents a list_to_atom flood from packets that happen to match.
Thanks Matt!
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