On Linux, Once use kubevpn connect to k8s cluster network, then lost connection to internet network?

Reason

There is no optimal method for setting up DNS in the Linux system, as there are numerous types of Linux distributions.

Set up a separate DNS for the tun device

Install tools resolvectl

When resolvectl is not installed by default, it can be added to the system by following step

Package information for resolvectl

Operating system	Package name	Installation
AlmaLinux	systemd-resolved	`dnf install systemd-resolved`
Arch Linux	systemd	`pacman -S systemd`
Debian	systemd	`apt install systemd`
Fedora	systemd-resolved	`dnf install systemd-resolved`
Red Hat Enterprise Linux	systemd-resolved	`dnf install systemd-resolved`
Rocky Linux	systemd-resolved	`dnf install systemd-resolved`
Ubuntu	systemd	`apt install systemd`

Once installed, you can enable the service by command:

systemctl enable systemd-resolved.service

systemctl start systemd-resolved.service

try command:

resolvectl status

it shows the information related to name resolution coming from the resolve daemon.

Please reboot computer, this is very important.

after reboot computer, use kubevpn connect to connect, all thing should works fine.