Network address translation
Network address translation is a networking technique that rewrites IP addresses and often transport-layer ports as traffic crosses a gateway or network boundary.
Acing the CCNA Exam: Volume 2 Advanced Networking and Security
Network Address Translation is a technique that rewrites network-layer addresses and often transport-layer ports as traffic crosses a gateway.
- How it is used
- Deploys NAT at a network perimeter to let private IPv4 hosts communicate over the internet.
- How deep it goes
- Explains packet translation, address terminology, and interface marking, but stops short of detailed NAT types and pool configuration.
- Examples
- Uses PC1, perimeter router R1, private addressing, public translation, and server 8.8.8.8 to trace a request and reply.
- What you can do after
- Operate/configure Cisco NAT interfaces with ip nat inside and ip nat outside for private-to-public translation.
Terraform in Depth: Infrastructure as Code with Terraform and OpenTofu
Network address translation is a technique that translates network addresses so private-network resources can communicate with external networks.
- How it is used
- Enables private-network resources to access the internet while keeping them inaccessible to direct inbound internet traffic.
- How deep it goes
- Explains subnet placement, public IP assignment, route-table forwarding, gateway cost, and the more involved NAT-instance alternative.
- Examples
- Uses a three-tier application, two-segment and three-segment networks, and Terraform subnet modules as concrete examples.
- What you can do after
- Apply it via Terraform by configuring public and private subnets, a NAT gateway, and routes for private-subnet internet access.
Related concepts
- dynamic port address translationincludes · Dynamic Port Address Translation is a Network Address Translation technique that dynamically maps many internal hosts to one public IP address by distinguishing connections with transport-layer ports.
- private ipv4 addressuses · A private IPv4 address is an address from a designated range intended for communication within private networks rather than direct routing on the public Internet.
- global addressuses · A global address is a host address as represented after a NAT router translates it or from the perspective of the outside network.
- public ip addressproduces · A public IPv4 address is a globally unique IPv4 network address routable on the public Internet and assigned to an internet-facing resource.
- NAT gatewayimplemented by · A NAT gateway is a network component that enables private-network resources to initiate outbound connections through address translation without accepting unsolicited inbound connections.
- IP addressuses · An IP address is a numerical address used by the Internet Protocol to identify a network interface and support packet delivery across networks.
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