passwordless ssh with public/private key pair

ssh-keygen -t rsa

~/.ssh/identity
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cat ~/.ssh/identity.pub | ssh user@10.10.14.75 -p 2200 'umask 0644; cat >> .ssh/authorized_keys'

ssh -p 2200 -oKexAlgorithms=+diffie-hellman-group1-sha1 -i ~/.ssh/flederwiesel.rsa root@192.168.236.42