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9be21088f4
Originally found when adding tests for working with cached netmaps, and finding the added tests to be flakey. When working off of a cached netmap, if a node exists in the cached netmap but does not yet have any endpoints, DERP connections are available but not direct ones. By sending callMeMaybe to nodes without endpoints in the cached netmap, we can establish direct connections for this edge case. Aditionally, ensure that TSMP disco advert messages are not sent if the endpoint does not have a valid address yet. Fixes #19843 Updates #19597 Signed-off-by: Claus Lensbøl <claus@tailscale.com>