Hi, I realized that the internet killswitch in my GL-MT300N-V2 Mango leaks. At least I can clearly diagnose a DNS leak. How? From the logs of my DNS server I can clearly show that DNS requests from the routers LAN are forwarded to WAN so they are not blocked by the killswitch. When does it occure? Everytime the router boots and when you disconnect from the VPN server via the web UI (the GL iNet not luci). I did not perform actual network sniffing to check if there are also further leaks but for me no leak at all is accetable. As soon as you are connected to the VPN server there are no more DNS leaks.
For me it turns out that the killswitch is not working at all. The only purpose of an internet killswitch is to block internet access when there is no VPN tunnel active, right?
I would appreciate it if you could fix that. Thanks!
I am using v3.105
Edit: I can clearly see in the DNS servers log that it forwards the DNS requests from LAN to WAN before it establishes the VPN tunnel because requests for the VPN servers hostname are shown later in the log.