100% working killswitch

[vans25 0]

Hi 
Looking for help to correctly setup killswitch 
To be 100% safe want to set something or rules (iptables or nftables) to prevent airvpn as not primary network adapter just to prevent any possible circumstances .

Generally the only way to connect internet must be through nvpn this is what I'm looking for

How to do it?
Looking for guide how to do it properly
debian10

[OpenSourcerer 1360]

Easy version? Eddie's Network Lock.
Hard version? Try these for orientation and take IPv6 into account.

[vans25 0]

Hi
Thanks for you reply 
I'm looking for some killswitch setup guide with nftables (as debian10 use it)

Edited ... by vans25