/etc/ssh_config prevents connection to some local IP ranges

reported by user:

The non-routable IP range 172.16.* on /etc/ssh_config don’t allow to connect to the local IP 172.20.1.1

The 172. prefix is 20 bits, from 172.16.0.0 to 172.31.255.255

Desired result:

ssh_config should allow us to connect to 172.20.1.1

Original created by @emmapeel on 8794 (Redmine)

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