Windows: There are two options for disabling IPv6 in Windows. Note: Depending on the version of OSX, this may be able to be turned off just set to Local-Link only. Select Local-Link only or off for Configure IPv6. This registry value doesnt affect the state of the following check box. If you want to watch a detailed video on T-Mobiles IPV6 translation stuff you can watch this. Select the first connection in your list and click Advanced. Using the network properties GUI to disable IPv6 is not supported. I would check logs on your server and see if the server is seeing the connection. If you do not have this option, select Link-local Only.
Select the first network connection you see listed on the left-hand side (usually Ethernet or Wi-Fi), then click the Advanced button. You may be seeing an IPV6 connection in the openvpn client if the DNS method is being used, but once that packet hits T-Mobiles gateway it's all IPV4 back to your server. On the preferences window, click Network. If your openvpn conf has a server specified by DNS address, T-Mobiles DNS servers will turn any A (IPV4) record into an AAAA (IPV6) record of the IPV6 address that will be routed to their NAT64 gateway before being sent as IPV4 to your openvpn server.Īll that said, it should work fine.
If your openvpn conf has a server specified with an IPV4 address, the android kernel will translate that to an IPV6 address which will be routed to T-Mobiles NAT64 gateway out an IPV4 address and to your IPV4 server. T-Mobile uses NAT64 and 464XLAT to translate IPV6 to the IPV4 internet. University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1.Depending on your phone, if it's a newer android, you may only get IPV6. When travelling, especially in Asia’s far-eastern and south-east sections (China, Japan, Korea, Malaysia, Philippines, etc.) IPv6 should be re-enabled by making the change in step #4 back to “Automatically”, then “OK”, “Apply”, and turn Wi-Fi off, and then on. Make sure you are connected to your home wireless network, and then try connecting to Cisco. Then turn WiFi OFF, wait about 10 seconds, then turn WiFi back ON.ġ. Click ‘ System Preferences ‘ and tap on the ‘ Network ‘ icon. Click the "Apply" button at the bottom-right of the Network window.Ģ. Follow the steps below to disable IPv6 on your macOS X device. Click the "OK" button at the bottom-right of the Wi-Fi window which will close the WiFi settings window and return you to the Network Preferences window.ġ. On the "TCP/IP" tab (2nd tab from top-left) near the middle of the window for the Configure IPv6 settings, click the drop-down list and change it from "Automatically" to be "Link-local only"Ģ. Click the "Advanced." button near the lower-right corner of the window.ġ. Click "WiFi" in the list of network services along the left side of the window.ģ. Open "System Preferences", then select "Network" (or click on the WiFi icon on the menu bar near the upper-right of your display, and then select “Open Network Preferences…” from the drop-down list.)Ģ. Click the Configure IPv6 pop-up menu, choose Manually, then enter the IPv6 address, router address, and prefix length you. Select the network service you want to use with IPv6, such as Ethernet or Wi-Fi. Here are the steps to disable IPv6 for WiFi on any MacBook laptop (IPv6 is not used for most of North America so you can leave it turned off for your WiFi on the MacBook unless you are traveling outside the continent.)ġ. On your Mac, choose Apple menu > System Preferences, then click Network. A VPN connection will not be established.”ĭisabling IPv6 for WiFi has fixed this issue for several people. When attempting to launch Cisco An圜onnect they will see a prompt from stating “/!\ The VPN client was unable to successfully verify the IP forwarding table modifications.
Some Mac OSX users who are fully up to date with the latest version of Mac OSX and the latest version of Cisco An圜onect VPN are still having issues trying to make a VPN connection from their home network.
Cisco VPN troubleshooting: how to disable IPv6 with WiFi for Mac OSX Keith Peck kdpeck at uwaterloo.ca By default, IPv6 is enabled on MAC systems with Mac OS X v10.1 onwards. Cisco VPN troubleshooting: how to disable IPv6 with WiFi for Mac OSX