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OpenSSH server is configured by using sshd_config. I know there are defaults for nearly all options available and they are listed here (http://man.openbsd.org/sshd_config).

I know, that some defaults changed through different ssh versions and a colleauge of mine added that even the same ssh versions between different Unix flavours use different default values.

Is there an overview available which version/OS/... uses which default values?

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    No. Why would you need that? – Jakuje Jan 30 '17 at 13:23
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/usr/sbin/sshd -tT enables test mode and extended test mode. This command dumps a normalized output of what settings are going to be set and to which values.

I use the -tT first, and use the captured output as the starting point of all my configs. This way I know exactly and explicitly what is going on with this particular release/build of OpenSSH. It's annoying to do it for every release, but it's the only way I found to get the real values.

I used to parse out the manpage, but that turned out to be lagging behind the settings in the code.

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