Same host Same host Same host Multi-host Multi-host Discovery and DNS DNS server in Docker engine DNS /etc/hosts DNS server in Docker engine DNS server in Docker engine DNS server in Docker engine External connectivity Host gateway NAT NAT No external connectivity No external connectivity Swarm Since 17.06 Since 17.06 Since 17.06 Supported Since 17.06 Application Need full networking, no isolation North-South external access North-South external access Connectivity across hosts Containers needing underlay networking Networking #andaluciasummer