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By default, Nebula replies to packets it has no tunnel for with a `recv_error` packet. This packet helps speed up re-connection in the case that Nebula on either side did not shut down cleanly. This response can be abused as a way to discover if Nebula is running on a host though. This option lets you configure if you want to send `recv_error` packets always, never, or only to private network remotes. valid values: always, never, private This setting is reloadable with SIGHUP.