Networking :: Access A PC In A Subnet From The Internet

So supposing I have a LAN with 2 PCs with subnet IPs of and .3 (router being .1) and I'd like to connect to one of them for file sharing using sftp from anywhere on the public Web. Now a static IP is really useful in this case I understand, but lets just say I know the public IP address of my LAN at any given point. From outside if I know my public IP?

This is assuming all computers use Ubuntu.

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