According to an NetBSD announcement, the OpenSSH-based implementation is temporary. They believe it will be replaced within the next couple months with a "completely independent implementation". Other NetBSD mailing lists indicate that it is an independant, written-from-scratch, modular (protocols, crypto libraries, OS support, authentication mechanisms) and portable ssh implementation. It is not yet available to public, according to various mailing list postings, until a couple missing features are added. (OpenSSH is derived from the original ssh-1.2.12.)
The new in-tree SSH uses new configuration filenames: /etc/sshd.conf and /etc/ssh.conf (instead of /etc/sshd_config for example).
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