The SSH proxy is the barrier between your internal machines (without public or floating IPs) and the public internet. With the SSH proxy, you'll have an extra layer of security on top of your VMs. It's equipped with fail2ban, automatic security updates and more.
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To connect to a VM hidden behind the proxy, specify the jump flag -J when connecting via SSH:
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Where ssh-proxy is the public IP of your SSH proxy, and internal-vm is the private IP of the VM you want to connect to.