Lois Larson
Apple's AirPort Extreme is a router that offers robust security features, including firewall protection, for a safe and reliable internet connection. While the AirPort production has been ceased since 2018, many users still rely on this device for their networking needs. In this discussion, we will delve into the steps and considerations for setting up and configuring the AirPort Extreme firewall to ensure a secure online experience. By understanding the intricacies of firewall settings, users can enhance their network security and enjoy uninterrupted connectivity for their various devices, including gaming consoles and smart home systems.
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What You'll Learn
Double NAT
To resolve the Double NAT issue, you can choose between two methods:
Method 1: Harder Way
- Set your ISP's modem/router to bridge mode.
- Configure the Airport Extreme to handle the connection using PPPoE.
- The Airport Extreme will now manage the NAT and DHCP.
- Adjust the firewall and open the required ports on the Airport Extreme.
Method 2: Easier Way
- Set the Airport Extreme to bridge mode.
- The modem/router provided by your ISP will assign a private IP address to the Airport Extreme.
- Any devices connected to either the Airport Extreme or your ISP's modem/router will be assigned private IP addresses by the ISP's modem/router's DHCP server.
- Adjust the firewall and open the required ports on the ISP's modem/router. The Airport Extreme will simply pass traffic through.
It is important to note that the harder way may be more challenging as the ISP's modem/router might not be easily set to bridge mode. On the other hand, the easier way allows you to avoid making changes to the Airport Extreme's settings.
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Port forwarding
Identify the IP Address:
First, you need to determine the IP address of the device you want to forward ports to. This is typically done by accessing the router's settings and finding the device on the network. In the Apple ecosystem, this can be achieved through System Preferences, where you can locate the MAC address of the wireless adapter.
Connect to the Base Station:
For 802.11n or 802.11ac AirPort Extreme Base Stations, you can connect to the base station's Wi-Fi network. Alternatively, you can use an Ethernet cable to connect directly to one of the LAN ports on the base station.
Reserve an IP Address:
Once connected, launch the AirPort Utility and navigate to the Network tab. Here, you will need to reserve a DHCP-provided IP address for the host device, which is the device you want to access remotely. This step ensures that the device has a static IP address, making it easier to forward ports to it.
Configure Port Forwarding Rules:
Now, you can set up specific port forwarding rules. Click the "+" (Add) button under Port Settings in the AirPort Utility. Provide a description for the port mapping and enter the relevant UDP and TCP port values. You will need to specify both public and private port values, ensuring they match the corresponding ports on the host device.
Verify ISP Restrictions:
Before concluding, it's important to verify if your Internet Service Provider (ISP) restricts any ports. Certain ports may be restricted unless you subscribe to a higher-tier service plan, such as a "business-grade" level of Internet service. Contact your ISP or consult their documentation to ensure that the ports you need are accessible.
Test the Configuration:
Finally, test the port forwarding setup by accessing the device remotely or using port scanning tools. Ensure that the device is reachable and that the correct ports are open and functioning as expected.
Remember that port forwarding can make your network more vulnerable to external threats, so it's essential to have robust security measures in place, such as a reliable firewall and secure passwords.
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Bridge mode
If you are using Bridge Mode on your Airport Extreme, it means that you are using another router in conjunction with your modem. This is because Bridge Mode will only allow one device to connect at a time. In this case, you would rely on the other router to enable any type of firewall setting that it may have onboard.
When your Airport Extreme is in Bridge Mode, DHCP and NAT are off, so the NAT firewall is not enabled. If you want to use a gaming console to play interactive games online, you may need to discuss another configuration option that involves further changes to both the modem and Airport Extreme.
If you are using a simple modem with only one ethernet port, it will only deliver one IP address to the Airport Extreme. In this case, the correct setting for Connection Sharing on the Airport Extreme would be "Share a public IP address".
You can also use Airport Extreme in Bridge Mode as a guest network. This is useful if you want to use Apple's Guest Network without using the Airport as your main router.
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NAT firewall
The AirPort Extreme Base Station (AEBS) employs a simple NAT firewall. When DHCP and NAT are enabled, the NAT firewall is "On". If the AirPort Extreme is in Bridge Mode (DHCP and NAT are off), the firewall is not enabled.
To set up port mapping on an 802.11n AirPort Extreme Base Station (AEBSn), you can either connect to the AEBSn's wireless network or temporarily connect directly using an Ethernet cable to one of the LAN ports of the AEBSn. Then, use the AirPort Utility, in Manual Setup, to make the following settings:
- Click '+' in the dialog that pops up, and put the port you are using into all four port fields. Ignore the 'chose a service' dropdown.
- Put the local IP of your Mac into the IP field. If you don't know your IP, you can find it in System Preferences under the Network -> TCP/IP tab, via ifconfig from the console, or via utilities such as iStatPro.
- Click 'Continue', give the setup a name in the description field, and leave the other fields blank.
- Click 'Done'.
If you are unable to access the NAT tab in Airport Utility, it may be because your modem is also a router and does NATing, causing the Airport Extreme to become a switch rather than a router. To resolve this, you can log in to your modem and do the port forwarding there, or disable NAT in the modem to let the Airport do the routing.
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NAT port mapping
To set up NAT port mapping on your Airport Extreme, follow these steps:
- Log in to your Airport Extreme router: Open a web browser and enter the IP address of your Airport Extreme. The default IP address is typically something like 10.0.0.1 or 10.0.1.1. If you're not sure, you can find the correct IP address by checking the label on your router or by using a network scanning tool. Once you have the IP address, enter it into your browser's address bar and log in using your administrator credentials.
- Navigate to the Port Mapping settings: Look for a section labelled "Port Mapping," "NAT Port Mapping," or "NAT-PMP." This may be under an "Advanced" or "Firewall" section in your router settings.
- Create a new port mapping entry: Click on the "+" button or "Add a new entry" option to create a new port mapping rule.
- Specify the port details: In the new entry, you will need to provide the following information:
- Public and Private Port Numbers: Enter the port number that you want to forward on your public IP address, such as 80 or 9000. Typically, you will use the same port number for both public and private ports.
- Protocol: Select TCP, UDP, or both, depending on the protocol used by the application or device you are forwarding ports for.
- Private IP Address: Enter the local IP address of the device on your network that you want to forward ports to. For example, if you want to forward ports for a Raspberry Pi, enter its IP address here.
- Save the port mapping entry: After filling out the details, click "Continue," "Save," or "Apply" to save the new port mapping rule.
- Test the configuration: Try accessing the device or service from outside your network to ensure that the port forwarding is working as expected.
Note: If you cannot find the NAT or Port Mapping settings in your Airport Extreme, it might be because your modem is also a router and is handling the NAT functionality. In this case, you can try logging into your modem and setting up port forwarding there, or you can disable NAT on the modem and let the Airport Extreme handle the routing.
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Frequently asked questions
When DHCP and NAT are enabled, the NAT firewall is "On". If the AirPort Extreme were in Bridge Mode (DHCP and NAT are off), then the firewall would not be enabled.
Double NAT allows you to use just about anything for your second router or mesh setup. It also means that your second router-connected devices are behind another range of private IP addresses.
If you need to keep using your airport setup, disable the router and use the router on the trash can for routing (with WiFi radios disabled). The trash can would then be assigning IPs to your devices and the airports would act as WAPs.
