1. ISP SP Network Egress Points Ingress Point Protocol-Specific Egress Decision IP Header Payload Transit Header IP Header Payload IP Header Payload

2. ISP IPv4 SP Network 6RD Border Relay IPv6 Transit 6RD CPE IPv6 Local Network IPv6 Header Payload IPv4 Header IPv6 Header Payload IPv6 Header Payload

3. ISP MPLS SP Network MPLS V6PE IPv6 Transit MPLS V6PE IPv6 Local Network IPv6 Header Payload MPLS Header IPv6 Header Payload IPv6 Header Payload

4. ISP IPv4 Network (Private Address) ISP IPv4 Network (Private Address) CGN NAT IPv4 Transit CPE NAT IPv4 Local Network (Private Address) IPv4 Header Payload IPv4 Header Payload IPv4 Header Payload

5. ISP IPv4 Network A+P Gateway IPv4 Transit A+P CPE NAT IPv4 Local Network (Private Address) IPv4 Header Payload IPv4 Header Payload IPv4 Header Payload Ports: 0-16383 Ports: 16384-32767 Ports: 32768-49151 Ports: 49152-65535

6. IPv6 Header ISP IPv6 Network D-S Lite CGN IPv4 Transit D-S Lite CPE IPv4 Local Network (Private Address) IPv4 Header Payload IPv4 Header Payload IPv4 Header Payload

7. ISP IPv6 Network NAT64 IPv4 Transit V6-only host IPv6 Header Payload IPv6 Header Payload IPv4 Header Payload DNS64