Unable to Access Internet with NAT64 Network Sharing on MacBook Pro running macOS High Sierra

Enabling NAT64 Test for IPv6 Connectivity on MacBook running macOS High Sierra

When using a MacBook as a NAT64 gateway to share an IPv4 Internet connection with IPv6-capable devices such as smartphones, enabling IPv6 connectivity via Internet Sharing on macOS High Sierra (10.13.6) can sometimes result in the devices failing to access the Internet. This article provides a step-by-step guide to enabling NAT64 test for IPv6 connectivity on a MacBook running macOS High Sierra.

Requirements

Before proceeding, ensure that the following requirements are met:

• A MacBook running macOS High Sierra (10.13.6)
• An IPv4 Internet connection
• An IPv6-capable device (e.g., smartphone) to test the connectivity

Enabling NAT64

To enable NAT64 on the MacBook, follow these steps:

1. Open System Preferences.
2. Click on "Sharing".
3. Select "Internet Sharing" from the list of sharing options.
4. Check the box next to "Internet Sharing" to enable it.
5. Select the Ethernet interface as the "Share your connection from:" option.
6. Check the box next to "Internet Sharing - IPv6" and select "NAT" as the NAT type.
7. Click on the "Wi-Fi Options..." button and configure the Wi-Fi network settings as desired.
8. Click "OK" to save the changes and restart the Internet Sharing service.

Testing IPv6 Connectivity

To test the IPv6 connectivity on the IPv6-capable device, follow these steps:

1. Connect the device to the MacBook's Wi-Fi network.
2. Open the device's network settings and check if the IPv6 address is obtained automatically.
3. Open a web browser on the device and try accessing a website that supports IPv6 (e.g., ).
4. If the website loads successfully, then the IPv6 connectivity is working correctly.

Troubleshooting

If the IPv6 connectivity fails, try the following troubleshooting steps:

1. Check if the MacBook's Ethernet interface has an IPv4 address and is connected to the Internet.
2. Check if the Wi-Fi network settings on the IPv6-capable device are correct.
3. Check if the MacBook's firewall is blocking IPv6 traffic.
4. Try disabling and re-enabling the NAT64 option in Internet Sharing.

References

For further information, refer to the following resources:

• Apple Support: Internet Sharing
• Apple Support: IPv6 on Mac