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Or even if the first router has the port forwards, it can’t forward the traffic to a device that’s connected to the second router. The problem with double NAT is that if the first router on your network doesn’t have the port forwards configured, incoming traffic will stop there even if you have the port forwards configured on the second router. I can’t do that if my gateway is also performing NAT (network address translation).

This screenshot shows how I’ve configured my router for port forwarding, so that I can use remote SSH (Secure Shell) on a server on my local network. Services like these sometimes require certain ports to be opened in the router’s firewall and directed to a particular computer or device on the network. This would include online gaming on computers or consoles, remote desktop into your computers, connecting to a VPN server, or accessing security camera feeds. When there’s double NAT on your network, you might run into issues with services that require UPnP (Universal Plug-and-Play) support or manual port forwarding. But if there’s multiple Ethernet ports or if it supports Wi-Fi connections, it’s likely performing NAT and routing as well. If there’s only one Ethernet port, it’s likely a simple modem (aka a broadband gateway). To allow all MAC addresses except those in the list.If you’re unsure what the ISP has given you, take a look at the box. Any attempt to communicate by masquerading the IP address will blocked as the attacker’s computer’s MAC address will not match with the MAC address of the whitelisted devices. In this way they retain their ability to communicate with the network. In this example the FortiGate is configured to accept traffic from only specific MAC addresses, and whitelisted devices are assigned new IP addresses through DHCP. Generally in a wireless environment a common security measure to prevent any unwanted network access is MAC address filtering. In a network, MAC address filtering is more secure and more reliable than IP address filtering because the MAC address does not change.