@TPVPN TP-link Archer D2 doesn't support OpenVPN. This feature depends on a FW implementation - the last FW release is from the beginning of 2016 (EOL). The guide you posted is targeted to a...

@kotya I believe this behaviour depends on which interace you've bound your python http.server - look at this thred sloution and try to reproduce it.

@dev_ninja When downloading the FW from the support portal make sure you've used the correct FW region and HW version. Try downloading the FW from here.

@kotya Since your PC is connected to the router via cable, while the Android phone is connected to its Wi-Fi, they are on the same LAN. Hence there's no need to open ports in router Virtual Servers...

@PKP You wrote: "Ping from 192.168.2.* to internet works with TP Link Archer C2, but not with Archer C6. Same configuration." I really can't say why's that. It needs some troubleshooting. Try these...

@Kreco Check this answer.