Список хостов.
~/.ssh/config
Host *
ForwardAgent yes
-----------------------------
Host alpha
HostName alpha.pupkin.net
User v.pupkin
-----------------------------
Host beta
HostName 192.168.1.17
User v.pupkin
ProxyCommand ssh alpha nc %h %p
-----------------------------
Host *.pup
User v.pupkin
ProxyCommand ssh beta nc %h %p
Вход без пароля.
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