Understand the risks that come with having your Mac accessible to the whole internet through SSH. You can ask them and usually you'd have to pay extra. This is uncommon as most ISPs give dynamic ones which change after a few hours. You should aim to have a static public IP address for your router from your ISP. You must get a static IP address for your Mac on the LAN so that you can port forward for longer than a few hours (or however long your DHCP client lease time is).

This can be found by googling 'what's my ip' or from the terminal: curl ipinfo.io/json If you have successfully port forwarded SSH traffic from your router to your private ip address, then you shall be able to SSH into your mac by using the normal method except you now have to use your public ip address. You may find your default username and password printed on your router at the back given by your ISP.

You can usually access these by going to (or whatever the IP address is for your router - how to find it). To do this, you'll need to look for the Port Forwarding settings on your router. So if you wanted to SSH into your Mac from outside your (presumably home) network, you will need to make your router forward port 22 (SSH) from the WAN (the internet) to your mac at 192.168.1.XXX port 22. You are right in recognising that addresses are reserved for private (Local Area Network) addresses. You are right in enabling the Remote Login option under Sharing.

Github ssh for mac