Bonus if you have Back To My Mac enabled! Back To My Mac will enable Wide Area Bonjour and do all the necessary port forwarding (via UPnP/NAT-PMP and private I

Bonus if you have Back To My Mac enabled! Back To My Mac will enable Wide Area Bonjour and do all the necessary port forwarding (via UPnP/NAT-PMP and private IPv6 network between your Macs), as long as all machines are logged into the same Apple ID account, you can access the shared services on target machine (VNC, SSH, file sharing, etc.) from a different network right from Finder as well.