- `ssh_interface` (string) - One of `public_ip`, `private_ip`, `public_dns`, or `private_dns`. If set, either the public IP address, private IP address, public DNS name or private DNS name will used as the host for SSH. The default behaviour if inside a VPC is to use the public IP address if available, otherwise the private IP address will be used. If not in a VPC the public DNS name will be used. Also works for WinRM. Where Packer is configured for an outbound proxy but WinRM traffic should be direct, `ssh_interface` must be set to `private_dns` and `.compute.internal` included in the `NO_PROXY` environment variable. - `ssh_ip_version` (string) - The IP version to use for SSH connections, valid values are `4` and `6`. Useful on dual stacked instances where the default behavior is to connect via whichever IP address is returned first from the OpenStack API.