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Why does my connection sometimes work and sometimes not, especially when using personal hotspots or LTE/5G routers?
When your IPsec connection is often able to establish a connection, but sometimes times out because there was no response to the first packet, the problem might be due to host name resolution. This is often the case in IPv6-based networks such as cellular connection, e.g. also when using the Personal Hotspot function on the iPhone.
Some host names can resolve to both IPv4 and IPv6 addresses, but depending on your current network location and VPN gateway it's possible that only IPv4 addresses work correctly.
You can enforce resolving to IPv4 addresses only for your connection:
- Edit your connection.
- Navigate to the “Advanced Options” section.
- In “Additional Settings”, change the setting “Connect using IPv4 or IPv6” to “Use IPv4”.
- Save your connection and start your connection.
sudo networksetup -setv6off Wi-Fi
Note: If your Wi-Fi interface has a different name (e.g., `en0`), replace "Wi-Fi" with the correct name. You can check the name of the interface using this command:
networksetup -listallnetworkservices
3. After entering the command, you'll be prompted to enter your admin password.
This will completely disable IPv6 for your Wi-Fi connection.