I run a Ubuntu server where I have a split tunnel for VPN. Which means I have a "normal" connection to the internet for most of my services but also a tunneled connection that only a few services use. My server is in this context the client of the VPN.
I would like to know if I got DNS-leaks on the VPN tunnel. There is websites to test this but can't really use them from the terminal.
How should one solve this issue to be able to confirm if I have DNS-leaks or not?