Let’s configure these IP addresses first: Before we dive into the NAT configuration let’s do a trace and look at the output: R1traceroute 192.168.12.2 Type escape sequence to abort. Nat loopback setup and availability greatly differs by router manufacturer and ISP. To be able to host a server and play on that server within the same network NAT loopback is required. This allows Squad servers to be hosted and played on the same machine and network. If you don't have local DNS setup, and simply get your DNS records from the router then your other option (though more time consuming) is to add the local IP addresses and the required host address to the host file of each machine, though that does obviously R2 has a loopback 0 interface with IP address 2.2.2.0 /24. NAT loopback, aka Hairpinning, is a communication configuration that allows an IP to be mapped internally. To the network, simply add a DNS record for into your local DNS, so when your machines query it they receive the answer from the local network (pointing to the relevant local IP) rather than from the internet. If you dont use split DNS, for whatever reason, this name will always be resolved to the public IP address. You need to access it when you are in the office and when you are outside. Imagine that you host your own email server inside the network. If you have a AD setup, or the NAT server is providing DNS resolution Nat loopback is useful when you have some DNS issue.
If for example you're trying to access which points to your external IP address, then the solution is to provide a different result to users when they're connected locally. If that's the case then using DNS is a betterĪnd simpler solution rather than nat loopback.
The normal reason is that you have a resource that's accessible from outside using the public IP address, and you want users to be able to access that from within the network using the same settings as outside. The real question is why you need to be able to address the public IP? though I do know some firewalls including some Watchguards will allow it. NAT loopback enables a user on the trusted or optional networks to connect to a public server with the public IP address or domain name of the server, if the server is on the same physical Firebox interface. It's the router which is controlling the public IP side of things, and most routers / firewalls don't support NAT loopback. I don't think there's any way around this realistically.
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